From feb609e10d4725bcf577c9d7f4bdc901465a6aaa Mon Sep 17 00:00:00 2001
From: Hans Boehm <boehm@acm.org>
Date: Sat, 22 Sep 2001 00:00:00 +0000
Subject: gc6.1alpha1 tarball import

---
 Makefile                   |  28 ++++++---
 Makefile.am                |   6 +-
 Makefile.direct            |  28 ++++++---
 Makefile.dj                |   2 +
 Makefile.in                |  20 ++----
 NT_THREADS_MAKEFILE        |  16 ++---
 allchblk.c                 |   1 +
 configure                  |   3 +
 configure.in               |  11 +++-
 dbg_mlc.c                  |  59 ++++++++++++++---
 doc/README                 |   2 +-
 doc/README.changes         |  43 +++++++++++--
 dyn_load.c                 | 111 +++++++++++++++++++++++++++++---
 finalize.c                 |   4 +-
 gc.mak                     |  16 ++---
 gc_dlopen.c                |   5 +-
 ia64_save_regs_in_stack.s  |  12 ++++
 include/gc.h               |  28 +++++----
 include/gc_gcj.h           |   2 -
 include/new_gc_alloc.h     |  15 ++++-
 include/private/gc_locks.h |  14 ++---
 include/private/gc_priv.h  |  28 +++++----
 include/private/gcconfig.h | 153 ++++++++++++++++++++++++++++-----------------
 irix_threads.c             |   6 +-
 linux_threads.c            |  50 ++++++++++-----
 mach_dep.c                 |  28 ++++++---
 malloc.c                   |   6 +-
 mark_rts.c                 |   4 +-
 misc.c                     |  36 +++++------
 new_hblk.c                 |   1 +
 os_dep.c                   |  54 ++++++++--------
 reclaim.c                  |  30 ++++++---
 solaris_pthreads.c         |   4 +-
 solaris_threads.c          |   4 +-
 specific.c                 |   4 +-
 tests/test.c               |  75 +++++++++++-----------
 threadlibs.c               |  15 ++---
 version.h                  |   4 +-
 win32_threads.c            |   4 +-
 39 files changed, 620 insertions(+), 312 deletions(-)
 create mode 100644 ia64_save_regs_in_stack.s

diff --git a/Makefile b/Makefile
index a5d24c65..72dd4133 100644
--- a/Makefile
+++ b/Makefile
@@ -10,13 +10,20 @@
 #	 c++ interface to gc.a
 # cord/de - builds dumb editor based on cords.
 ABI_FLAG= 
+# ABI_FLAG should be the cc flag that specifies the ABI.  On most
+# platforms this will be the empty string.  Possible values:
+# +DD64 for 64-bit executable on HP/UX.
+# -n32, -n64, -o32 for SGI/MIPS ABIs.
+
+AS_ABI_FLAG=$(ABI_FLAG)
+# ABI flag for assembler.  On HP/UX this is +A64 for 64 bit
+# executables.
+
 CC=cc $(ABI_FLAG)
 CXX=g++ $(ABI_FLAG)
-AS=as $(ABI_FLAG)
+AS=as $(AS_ABI_FLAG)
 #  The above doesn't work with gas, which doesn't run cpp.
 #  Define AS as `gcc -c -x assembler-with-cpp' instead.
-#  Under Irix 6, you will have to specify the ABI (-o32, -n32, or -64)
-#  if you use something other than the default ABI on your machine.
 
 # Redefining srcdir allows object code for the nonPCR version of the collector
 # to be generated in different directories.
@@ -54,12 +61,15 @@ HOSTCFLAGS=$(CFLAGS)
 #   gc.h before performing thr_ or dl* or GC_ operations.)
 #   Must also define -D_REENTRANT.
 # -DGC_SOLARIS_PTHREADS enables support for Solaris pthreads.
-#   Define SOLARIS_THREADS as well.
+#   (Internally this define GC_SOLARIS_THREADS as well.)
 # -DGC_IRIX_THREADS enables support for Irix pthreads.  See README.irix.
 # -DGC_HPUX_THREADS enables support for HP/UX 11 pthreads.
 #   Also requires -D_REENTRANT or -D_POSIX_C_SOURCE=199506L. See README.hp.
 # -DGC_LINUX_THREADS enables support for Xavier Leroy's Linux threads.
 #   see README.linux.  -D_REENTRANT may also be required.
+# -DGC_OSF1_THREADS enables support for Tru64 pthreads.  Untested.
+# -DGC_FREEBSD_THREADS enables support for FreeBSD pthreads.  Untested.
+#   Appeared to run into some underlying thread problems.
 # -DALL_INTERIOR_POINTERS allows all pointers to the interior
 #   of objects to be recognized.  (See gc_priv.h for consequences.)
 #   Alternatively, GC_all_interior_pointers can be set at process
@@ -191,8 +201,8 @@ HOSTCFLAGS=$(CFLAGS)
 #   15% or so.
 # -DUSE_3DNOW_PREFETCH causes the collector to issue AMD 3DNow style
 #   prefetch instructions.  Same restrictions as USE_I686_PREFETCH.
-#   UNTESTED!!
-# -DGC_USE_LD_WRAP in combination with the gld flags listed in README.linux
+#   Minimally tested.  Didn't appear to be an obvious win on a K6-2/500.
+# -DGC_USE_LD_WRAP in combination with the old flags listed in README.linux
 #   causes the collector some system and pthread calls in a more transparent
 #   fashion than the usual macro-based approach.  Requires GNU ld, and
 #   currently probably works only with Linux.
@@ -242,7 +252,8 @@ SRCS= $(CSRCS) mips_sgi_mach_dep.s rs6000_mach_dep.s alpha_mach_dep.s \
     include/gc_local_alloc.h include/private/dbg_mlc.h \
     include/private/specific.h powerpc_macosx_mach_dep.s \
     include/leak_detector.h include/gc_amiga_redirects.h \
-    include/gc_pthread_redirects.h $(CORD_SRCS)
+    include/gc_pthread_redirects.h ia64_save_regs_in_stack.s \
+    $(CORD_SRCS)
 
 DOC_FILES= README.QUICK doc/README.Mac doc/README.MacOSX doc/README.OS2 \
 	doc/README.amiga doc/README.cords doc/debugging.html \
@@ -435,6 +446,9 @@ mach_dep.o: $(srcdir)/mach_dep.c $(srcdir)/mips_sgi_mach_dep.s $(srcdir)/mips_ul
 	./if_mach SPARC SUNOS4 $(AS) -o mach_dep.o $(srcdir)/sparc_sunos4_mach_dep.s
 	./if_mach SPARC OPENBSD $(AS) -o mach_dep.o $(srcdir)/sparc_sunos4_mach_dep.s
 	./if_mach SPARC NETBSD $(AS) -o mach_dep.o $(srcdir)/sparc_netbsd_mach_dep.s
+	./if_mach IA64 HPUX as $(AS_ABI_FLAG) -o ia64_save_regs_in_stack.o $(srcdir)/ia64_save_regs_in_stack.s
+	./if_mach IA64 HPUX $(CC) -c -o mach_dep1.o $(SPECIALCFLAGS) $(srcdir)/mach_dep.c
+	./if_mach IA64 HPUX ld -r -o mach_dep.o mach_dep1.o ia64_save_regs_in_stack.o
 	./if_not_there mach_dep.o $(CC) -c $(SPECIALCFLAGS) $(srcdir)/mach_dep.c
 
 mark_rts.o: $(srcdir)/mark_rts.c $(UTILS)
diff --git a/Makefile.am b/Makefile.am
index 4fdf31b2..c0883ade 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -53,7 +53,7 @@ libgc_la_LDFLAGS = -version-info 1:1:0 -rpath $(toolexeclibdir)
 EXTRA_libgc_la_SOURCES = alpha_mach_dep.s \
 mips_sgi_mach_dep.s mips_ultrix_mach_dep.s powerpc_macosx_mach_dep.s \
 rs6000_mach_dep.s sparc_mach_dep.s sparc_netbsd_mach_dep.s \
-sparc_sunos4_mach_dep.s
+sparc_sunos4_mach_dep.s ia64_save_regs_in_stack.s
 
 AM_CXXFLAGS = @GC_CFLAGS@
 AM_CFLAGS = @GC_CFLAGS@
@@ -62,7 +62,9 @@ check_PROGRAMS = gctest
 # The following hack produces a warning from automake, but we need it in order 
 # to build a file from a subdirectory. FIXME.
 test.o:	tests/test.c
-	$(COMPILE) -c $<
+	$(COMPILE) -c tests/test.c
+# 	Using $< in the above seems to fail with the HP/UX on Itanium make.
+
 gctest_OBJECTS = test.o
 gctest_LDADD = ./libgc.la $(THREADLIBS) $(EXTRA_TEST_LIBS)
 TESTS_ENVIRONMENT = LD_LIBRARY_PATH=../../$(MULTIBUILDTOP)gcc
diff --git a/Makefile.direct b/Makefile.direct
index a5d24c65..72dd4133 100644
--- a/Makefile.direct
+++ b/Makefile.direct
@@ -10,13 +10,20 @@
 #	 c++ interface to gc.a
 # cord/de - builds dumb editor based on cords.
 ABI_FLAG= 
+# ABI_FLAG should be the cc flag that specifies the ABI.  On most
+# platforms this will be the empty string.  Possible values:
+# +DD64 for 64-bit executable on HP/UX.
+# -n32, -n64, -o32 for SGI/MIPS ABIs.
+
+AS_ABI_FLAG=$(ABI_FLAG)
+# ABI flag for assembler.  On HP/UX this is +A64 for 64 bit
+# executables.
+
 CC=cc $(ABI_FLAG)
 CXX=g++ $(ABI_FLAG)
-AS=as $(ABI_FLAG)
+AS=as $(AS_ABI_FLAG)
 #  The above doesn't work with gas, which doesn't run cpp.
 #  Define AS as `gcc -c -x assembler-with-cpp' instead.
-#  Under Irix 6, you will have to specify the ABI (-o32, -n32, or -64)
-#  if you use something other than the default ABI on your machine.
 
 # Redefining srcdir allows object code for the nonPCR version of the collector
 # to be generated in different directories.
@@ -54,12 +61,15 @@ HOSTCFLAGS=$(CFLAGS)
 #   gc.h before performing thr_ or dl* or GC_ operations.)
 #   Must also define -D_REENTRANT.
 # -DGC_SOLARIS_PTHREADS enables support for Solaris pthreads.
-#   Define SOLARIS_THREADS as well.
+#   (Internally this define GC_SOLARIS_THREADS as well.)
 # -DGC_IRIX_THREADS enables support for Irix pthreads.  See README.irix.
 # -DGC_HPUX_THREADS enables support for HP/UX 11 pthreads.
 #   Also requires -D_REENTRANT or -D_POSIX_C_SOURCE=199506L. See README.hp.
 # -DGC_LINUX_THREADS enables support for Xavier Leroy's Linux threads.
 #   see README.linux.  -D_REENTRANT may also be required.
+# -DGC_OSF1_THREADS enables support for Tru64 pthreads.  Untested.
+# -DGC_FREEBSD_THREADS enables support for FreeBSD pthreads.  Untested.
+#   Appeared to run into some underlying thread problems.
 # -DALL_INTERIOR_POINTERS allows all pointers to the interior
 #   of objects to be recognized.  (See gc_priv.h for consequences.)
 #   Alternatively, GC_all_interior_pointers can be set at process
@@ -191,8 +201,8 @@ HOSTCFLAGS=$(CFLAGS)
 #   15% or so.
 # -DUSE_3DNOW_PREFETCH causes the collector to issue AMD 3DNow style
 #   prefetch instructions.  Same restrictions as USE_I686_PREFETCH.
-#   UNTESTED!!
-# -DGC_USE_LD_WRAP in combination with the gld flags listed in README.linux
+#   Minimally tested.  Didn't appear to be an obvious win on a K6-2/500.
+# -DGC_USE_LD_WRAP in combination with the old flags listed in README.linux
 #   causes the collector some system and pthread calls in a more transparent
 #   fashion than the usual macro-based approach.  Requires GNU ld, and
 #   currently probably works only with Linux.
@@ -242,7 +252,8 @@ SRCS= $(CSRCS) mips_sgi_mach_dep.s rs6000_mach_dep.s alpha_mach_dep.s \
     include/gc_local_alloc.h include/private/dbg_mlc.h \
     include/private/specific.h powerpc_macosx_mach_dep.s \
     include/leak_detector.h include/gc_amiga_redirects.h \
-    include/gc_pthread_redirects.h $(CORD_SRCS)
+    include/gc_pthread_redirects.h ia64_save_regs_in_stack.s \
+    $(CORD_SRCS)
 
 DOC_FILES= README.QUICK doc/README.Mac doc/README.MacOSX doc/README.OS2 \
 	doc/README.amiga doc/README.cords doc/debugging.html \
@@ -435,6 +446,9 @@ mach_dep.o: $(srcdir)/mach_dep.c $(srcdir)/mips_sgi_mach_dep.s $(srcdir)/mips_ul
 	./if_mach SPARC SUNOS4 $(AS) -o mach_dep.o $(srcdir)/sparc_sunos4_mach_dep.s
 	./if_mach SPARC OPENBSD $(AS) -o mach_dep.o $(srcdir)/sparc_sunos4_mach_dep.s
 	./if_mach SPARC NETBSD $(AS) -o mach_dep.o $(srcdir)/sparc_netbsd_mach_dep.s
+	./if_mach IA64 HPUX as $(AS_ABI_FLAG) -o ia64_save_regs_in_stack.o $(srcdir)/ia64_save_regs_in_stack.s
+	./if_mach IA64 HPUX $(CC) -c -o mach_dep1.o $(SPECIALCFLAGS) $(srcdir)/mach_dep.c
+	./if_mach IA64 HPUX ld -r -o mach_dep.o mach_dep1.o ia64_save_regs_in_stack.o
 	./if_not_there mach_dep.o $(CC) -c $(SPECIALCFLAGS) $(srcdir)/mach_dep.c
 
 mark_rts.o: $(srcdir)/mark_rts.c $(UTILS)
diff --git a/Makefile.dj b/Makefile.dj
index 09fae4e6..7aadaf34 100644
--- a/Makefile.dj
+++ b/Makefile.dj
@@ -5,6 +5,8 @@
 # Primary targets:
 # gc.a - builds basic library
 # libgc.a - builds library for use with g++ "-fgc-keyword" extension
+#	    -fgc-keyword was never really available.  Historical
+#	    interest only.
 # c++ - adds C++ interface to library
 # cords - adds cords (heavyweight strings) to library
 # test - prints porting information, then builds basic version of gc.a,
diff --git a/Makefile.in b/Makefile.in
index b9d776ee..da1a642d 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -86,8 +86,6 @@ CXXINCLUDES = @CXXINCLUDES@
 DLLTOOL = @DLLTOOL@
 EXEEXT = @EXEEXT@
 EXTRA_TEST_LIBS = @EXTRA_TEST_LIBS@
-GCJ = @GCJ@
-GCJFLAGS = @GCJFLAGS@
 GC_CFLAGS = @GC_CFLAGS@
 INCLUDES = @INCLUDES@
 LIBTOOL = @LIBTOOL@
@@ -96,10 +94,8 @@ MAINT = @MAINT@
 MAKEINFO = @MAKEINFO@
 MY_CFLAGS = @MY_CFLAGS@
 OBJDUMP = @OBJDUMP@
-OBJEXT = @OBJEXT@
 PACKAGE = @PACKAGE@
 RANLIB = @RANLIB@
-STRIP = @STRIP@
 THREADLIBS = @THREADLIBS@
 VERSION = @VERSION@
 addobjs = @addobjs@
@@ -130,7 +126,7 @@ libgc_la_LIBADD = @addobjs@ $(THREADLIBS)
 libgc_la_DEPENDENCIES = @addobjs@
 libgc_la_LDFLAGS = -version-info 1:1:0 -rpath $(toolexeclibdir)
 
-EXTRA_libgc_la_SOURCES = alpha_mach_dep.s mips_sgi_mach_dep.s mips_ultrix_mach_dep.s powerpc_macosx_mach_dep.s rs6000_mach_dep.s sparc_mach_dep.s sparc_netbsd_mach_dep.s sparc_sunos4_mach_dep.s
+EXTRA_libgc_la_SOURCES = alpha_mach_dep.s mips_sgi_mach_dep.s mips_ultrix_mach_dep.s powerpc_macosx_mach_dep.s rs6000_mach_dep.s sparc_mach_dep.s sparc_netbsd_mach_dep.s sparc_sunos4_mach_dep.s ia64_save_regs_in_stack.s
 
 
 AM_CXXFLAGS = @GC_CFLAGS@
@@ -138,6 +134,8 @@ AM_CXXFLAGS = @GC_CFLAGS@
 AM_CFLAGS = @GC_CFLAGS@
 
 check_PROGRAMS = gctest
+# 	Using $< in the above seems to fail with the HP/UX on Itanium make.
+
 gctest_OBJECTS = test.o
 gctest_LDADD = ./libgc.la $(THREADLIBS) $(EXTRA_TEST_LIBS)
 TESTS_ENVIRONMENT = LD_LIBRARY_PATH=../../$(MULTIBUILDTOP)gcc
@@ -159,7 +157,7 @@ CONFIG_STATUS_DEPENDENCIES = $(srcdir)/configure.host
 
 MAKEOVERRIDES = 
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
-mkinstalldirs = $(SHELL) $(top_srcdir)/mkinstalldirs
+mkinstalldirs = $(SHELL) $(top_srcdir)/$gc_basedir/mkinstalldirs
 CONFIG_CLEAN_FILES = 
 LTLIBRARIES =  $(toolexeclib_LTLIBRARIES)
 
@@ -182,7 +180,7 @@ COMPILE = $(CC) $(DEFS) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CF
 CCLD = $(CC)
 DIST_COMMON =  Makefile.am Makefile.in acinclude.m4 aclocal.m4 \
 config.guess config.sub configure configure.in install-sh ltconfig \
-ltmain.sh
+ltmain.sh mkinstalldirs
 
 
 DISTFILES = $(DIST_COMMON) $(SOURCES) $(HEADERS) $(TEXINFOS) $(EXTRA_DIST)
@@ -194,7 +192,7 @@ OBJECTS = $(libgc_la_OBJECTS)
 
 all: all-redirect
 .SUFFIXES:
-.SUFFIXES: .S .c .lo .o .obj .s
+.SUFFIXES: .S .c .lo .o .s
 $(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ Makefile.am $(top_srcdir)/configure.in $(ACLOCAL_M4) 
 	cd $(top_srcdir) && $(AUTOMAKE) --cygnus Makefile
 
@@ -238,11 +236,6 @@ uninstall-toolexeclibLTLIBRARIES:
 .c.o:
 	$(COMPILE) -c $<
 
-# FIXME: We should only use cygpath when building on Windows,
-# and only if it is available.
-.c.obj:
-	$(COMPILE) -c `cygpath -w $<`
-
 .s.o:
 	$(COMPILE) -c $<
 
@@ -251,7 +244,6 @@ uninstall-toolexeclibLTLIBRARIES:
 
 mostlyclean-compile:
 	-rm -f *.o core *.core
-	-rm -f *.$(OBJEXT)
 
 clean-compile:
 
diff --git a/NT_THREADS_MAKEFILE b/NT_THREADS_MAKEFILE
index c90584ec..5f0b5462 100644
--- a/NT_THREADS_MAKEFILE
+++ b/NT_THREADS_MAKEFILE
@@ -114,10 +114,10 @@ CLEAN :
 
 CPP=cl.exe
 # ADD BASE CPP /nologo /MT /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /YX /c
-# ADD CPP /nologo /MD /W3 /GX /O2 /I include /D "NDEBUG" /D "SILENT" /D "GC_BUILD" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "WIN32_THREADS" /FR /YX /c
+# ADD CPP /nologo /MD /W3 /GX /O2 /I include /D "NDEBUG" /D "SILENT" /D "GC_BUILD" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "GC_WIN32_THREADS" /FR /YX /c
 CPP_PROJ=/nologo /MD /W3 /GX /O2 /I include /D "NDEBUG" /D "SILENT" /D "GC_BUILD" /D\
  "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D\
- "WIN32_THREADS" /FR"$(INTDIR)/" /Fp"$(INTDIR)/gc.pch" /YX /Fo"$(INTDIR)/" /c 
+ "GC_WIN32_THREADS" /FR"$(INTDIR)/" /Fp"$(INTDIR)/gc.pch" /YX /Fo"$(INTDIR)/" /c 
 CPP_OBJS=.\Release/
 CPP_SBRS=.\Release/
 
@@ -296,10 +296,10 @@ CLEAN :
 
 CPP=cl.exe
 # ADD BASE CPP /nologo /MTd /W3 /Gm /GX /Zi /Od /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /YX /c
-# ADD CPP /nologo /MDd /W3 /Gm /GX /Zi /Od /I include /D "_DEBUG" /D "SILENT" /D "GC_BUILD" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "WIN32_THREADS" /FR /YX /c
+# ADD CPP /nologo /MDd /W3 /Gm /GX /Zi /Od /I include /D "_DEBUG" /D "SILENT" /D "GC_BUILD" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "GC_WIN32_THREADS" /FR /YX /c
 CPP_PROJ=/nologo /MDd /W3 /Gm /GX /Zi /Od /I include /D "_DEBUG" /D "SILENT" /D "GC_BUILD"\
  /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D\
- "WIN32_THREADS" /FR"$(INTDIR)/" /Fp"$(INTDIR)/gc.pch" /YX /Fo"$(INTDIR)/"\
+ "GC_WIN32_THREADS" /FR"$(INTDIR)/" /Fp"$(INTDIR)/gc.pch" /YX /Fo"$(INTDIR)/"\
  /Fd"$(INTDIR)/" /c 
 CPP_OBJS=.\Debug/
 CPP_SBRS=.\Debug/
@@ -430,9 +430,9 @@ test.c : tests\test.c
 
 CPP=cl.exe
 # ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /YX /c
-# ADD CPP /nologo /MD /W3 /GX /O2 /I include /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "WIN32_THREADS" /YX /c
+# ADD CPP /nologo /MD /W3 /GX /O2 /I include /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "GC_WIN32_THREADS" /YX /c
 CPP_PROJ=/nologo /MD /W3 /GX /O2 /I include /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D\
- "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "WIN32_THREADS"\
+ "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "GC_WIN32_THREADS"\
  /Fp"$(INTDIR)/gctest.pch" /YX /Fo"$(INTDIR)/" /c 
 CPP_OBJS=.\gctest\Release/
 CPP_SBRS=.\.
@@ -516,9 +516,9 @@ CLEAN :
 
 CPP=cl.exe
 # ADD BASE CPP /nologo /W3 /Gm /GX /Zi /Od /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /YX /c
-# ADD CPP /nologo /MDd /W3 /Gm /GX /Zi /Od /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "WIN32_THREADS" /FR /YX /c
+# ADD CPP /nologo /MDd /W3 /Gm /GX /Zi /Od /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "GC_WIN32_THREADS" /FR /YX /c
 CPP_PROJ=/nologo /MDd /W3 /Gm /GX /Zi /Od /I include /D "_DEBUG" /D "WIN32" /D "_WINDOWS"\
- /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "WIN32_THREADS" /FR"$(INTDIR)/"\
+ /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "GC_WIN32_THREADS" /FR"$(INTDIR)/"\
  /Fp"$(INTDIR)/gctest.pch" /YX /Fo"$(INTDIR)/" /Fd"$(INTDIR)/" /c 
 CPP_OBJS=.\gctest\Debug/
 CPP_SBRS=.\gctest\Debug/
diff --git a/allchblk.c b/allchblk.c
index 76296721..06582ec7 100644
--- a/allchblk.c
+++ b/allchblk.c
@@ -774,6 +774,7 @@ signed_word size;
       if (HBLK_IS_FREE(hhdr)) {
         GC_printf1("Duplicate large block deallocation of 0x%lx\n",
         	   (unsigned long) hbp);
+	ABORT("Duplicate large block deallocation");
       }
 
     GC_ASSERT(IS_MAPPED(hhdr));
diff --git a/configure b/configure
index 1146ce66..602a5351 100755
--- a/configure
+++ b/configure
@@ -2366,6 +2366,9 @@ EOF
 #define SUNOS53_SHARED_LIB 1
 EOF
 
+    ;;
+ ia64-*-hpux*)
+    machdep="mach_dep.lo ia64_save_regs_in_stack.lo"
     ;;
 esac
 if test x"$machdep" = x; then
diff --git a/configure.in b/configure.in
index fa3f81ac..fcc0c710 100644
--- a/configure.in
+++ b/configure.in
@@ -96,7 +96,7 @@ case "$THREADS" in
 	;;
      *-*-freebsd*)
 	AC_MSG_WARN("FreeBSD does not yet fully support threads with Boehm GC.")
-	AC_DEFINE(FREEBSD_THREADS)
+	AC_DEFINE(GC_FREEBSD_THREADS)
 	INCLUDES="$INCLUDES -pthread"
 	THREADLIBS=-pthread
       	;;
@@ -157,6 +157,12 @@ case "$host" in
 # alpha*-*-*)
 #    machdep="alpha_mach_dep.lo"
 #    ;;
+ alpha-*-openbsd*)
+    if test x"${ac_cv_lib_dl_dlopen}" != xyes ; then
+       AC_MSG_WARN(OpenBSD/Alpha without dlopen(). Shared library support is disabled)
+       AM_DISABLE_SHARED
+    fi
+    ;;
  mipstx39-*-elf*)
     machdep="mips_ultrix_mach_dep.lo"
     AC_DEFINE(STACKBASE, __stackbase)
@@ -172,6 +178,9 @@ case "$host" in
  sparc-sun-solaris2.3*)
     AC_DEFINE(SUNOS53_SHARED_LIB)
     ;;
+ ia64-*-hpux*)
+    machdep="mach_dep.lo ia64_save_regs_in_stack.lo"
+    ;;
 esac
 if test x"$machdep" = x; then
    machdep="mach_dep.lo"
diff --git a/dbg_mlc.c b/dbg_mlc.c
index be3da8e2..af55032f 100644
--- a/dbg_mlc.c
+++ b/dbg_mlc.c
@@ -40,7 +40,7 @@ ptr_t p;
     register word sz = GC_size((ptr_t) ohdr);
     
     if (HBLKPTR((ptr_t)ohdr) != HBLKPTR((ptr_t)body)
-        || sz < sizeof (oh)) {
+        || sz < DEBUG_BYTES + EXTRA_BYTES) {
         return(FALSE);
     }
     if (ohdr -> oh_sz == sz) {
@@ -861,6 +861,28 @@ struct closure {
     (*(cl -> cl_fn))((GC_PTR)((char *)obj + sizeof(oh)), cl -> cl_data);
 } 
 
+/* Set ofn and ocd to reflect the values we got back.	*/
+static void store_old (obj, my_old_fn, my_old_cd, ofn, ocd)
+GC_PTR obj;
+GC_finalization_proc my_old_fn;
+struct closure * my_old_cd;
+GC_finalization_proc *ofn;
+GC_PTR *ocd;
+{
+    if (0 != my_old_fn) {
+      if (my_old_fn != GC_debug_invoke_finalizer) {
+        GC_err_printf1("Debuggable object at 0x%lx had non-debug finalizer.\n",
+		       obj);
+        /* This should probably be fatal. */
+      } else {
+        if (ofn) *ofn = my_old_cd -> cl_fn;
+        if (ocd) *ocd = my_old_cd -> cl_data;
+      }
+    } else {
+      if (ofn) *ofn = 0;
+      if (ocd) *ocd = 0;
+    }
+}
 
 # ifdef __STDC__
     void GC_debug_register_finalizer(GC_PTR obj, GC_finalization_proc fn,
@@ -875,14 +897,21 @@ struct closure {
     GC_PTR *ocd;
 # endif
 {
+    GC_finalization_proc my_old_fn;
+    GC_PTR my_old_cd;
     ptr_t base = GC_base(obj);
     if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
         GC_err_printf1(
 	    "GC_register_finalizer called with non-base-pointer 0x%lx\n",
 	    obj);
     }
-    GC_register_finalizer(base, GC_debug_invoke_finalizer,
-    			  GC_make_closure(fn,cd), ofn, ocd);
+    if (0 == fn) {
+      GC_register_finalizer(base, 0, 0, &my_old_fn, &my_old_cd);
+    } else {
+      GC_register_finalizer(base, GC_debug_invoke_finalizer,
+    			    GC_make_closure(fn,cd), &my_old_fn, &my_old_cd);
+    }
+    store_old(obj, my_old_fn, (struct closure *)my_old_cd, ofn, ocd);
 }
 
 # ifdef __STDC__
@@ -900,14 +929,22 @@ struct closure {
     GC_PTR *ocd;
 # endif
 {
+    GC_finalization_proc my_old_fn;
+    GC_PTR my_old_cd;
     ptr_t base = GC_base(obj);
     if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
         GC_err_printf1(
 	  "GC_register_finalizer_no_order called with non-base-pointer 0x%lx\n",
 	  obj);
     }
-    GC_register_finalizer_no_order(base, GC_debug_invoke_finalizer,
-     			  	      GC_make_closure(fn,cd), ofn, ocd);
+    if (0 == fn) {
+      GC_register_finalizer_no_order(base, 0, 0, &my_old_fn, &my_old_cd);
+    } else {
+      GC_register_finalizer_no_order(base, GC_debug_invoke_finalizer,
+    			    	     GC_make_closure(fn,cd), &my_old_fn,
+				     &my_old_cd);
+    }
+    store_old(obj, my_old_fn, (struct closure *)my_old_cd, ofn, ocd);
  }
 
 # ifdef __STDC__
@@ -925,14 +962,22 @@ struct closure {
     GC_PTR *ocd;
 # endif
 {
+    GC_finalization_proc my_old_fn;
+    GC_PTR my_old_cd;
     ptr_t base = GC_base(obj);
     if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
         GC_err_printf1(
 	    "GC_register_finalizer_ignore_self called with non-base-pointer 0x%lx\n",
 	    obj);
     }
-    GC_register_finalizer_ignore_self(base, GC_debug_invoke_finalizer,
-    			  	      GC_make_closure(fn,cd), ofn, ocd);
+    if (0 == fn) {
+      GC_register_finalizer_ignore_self(base, 0, 0, &my_old_fn, &my_old_cd);
+    } else {
+      GC_register_finalizer_ignore_self(base, GC_debug_invoke_finalizer,
+    			    	     GC_make_closure(fn,cd), &my_old_fn,
+				     &my_old_cd);
+    }
+    store_old(obj, my_old_fn, (struct closure *)my_old_cd, ofn, ocd);
 }
 
 #ifdef GC_ADD_CALLER
diff --git a/doc/README b/doc/README
index c6b48c3b..b161ccf4 100644
--- a/doc/README
+++ b/doc/README
@@ -27,7 +27,7 @@ are GPL'ed, but with an exception that should cover all uses in the
 collector.  (If you are concerned about such things, I recommend you look
 at the notice in config.guess or ltmain.sh.)
 
-This is version 6.0 of a conservative garbage collector for C and C++.
+This is version 6.1alpha1 of a conservative garbage collector for C and C++.
 
 You might find a more recent version of this at
 
diff --git a/doc/README.changes b/doc/README.changes
index c018c8b6..8c00e938 100644
--- a/doc/README.changes
+++ b/doc/README.changes
@@ -1360,7 +1360,7 @@ Since 6.0alpha8:
    it on untested platforms.
  - Integrated initial GNU HURD port. (Thanks to Chris Lingard and Igor
    Khavkine.)
- - A few more fixes for Digital Mars compiler.
+ - A few more fixes for Digital Mars compiler (Walter Bright).
  - Fixed gcc version recognition.  Renamed OPERATOR_NEW_ARRAY to
    GC_OPERATOR_NEW_ARRAY.  Changed GC_OPERATOR_NEW_ARRAY to be the default.
    It can be overridden with -DGC_NO_OPERATOR_NEW_ARRAY.  (Thanks to
@@ -1378,16 +1378,47 @@ Since 6.0alpha9:
  - Fixed a stack clearing problem that resulted in SIGILL with a
    misaligned stack pointer for multithreaded SPARC builds.
  - Integrated another HURD patch (thanks to Igor Khavkine).
+
+Since 6.0:
+ - Non-debug, atomic allocations could result in bogus smashed object
+   reports with debugging on.  (Thanks to Patrick Doyle for the small
+   test case.)
+ - Fixed GC_get_register_stack_base (Itanium only) to work around a glibc
+   2.2.4 bug.
+ - Initial port to HP/UX on Itanium.  Thread support and both 32 and 64
+   bit ABIs appear to work.  Parallel mark support doesn't yet, due to
+   some inline assembly code issues.  Thread local allocation does appear
+   to work.
+ - ifdef'ed out glibc2.1/Itanium workaround.  I suspect nobody is using
+   that combination anymore.
+ - Added a patch to make new_gc_alloc.h usable with gcc3.0.  (Thanks to
+   Dimitris Vyzovitis for the patch.)
+ - Debugged 64-bit support on HP/UX PA-RISC.
+ - Turned on dynamic loading support for FreeBSD/ELF.  (Thanks to Peter
+   Housel.)
+ - Unregistering of finalizers with debugging allocation was broken.
+   (Thanks to Jani Kajala for the test case.)
+ - Old finalizers were not returned correctly from GC_debug_register_finalizer.
+ - Disabled MPROTECT_VDB for Linux/M68K based on a report that it doesn't work.
+ - Cleaned up some statistics gathering code in reclaim.c (Thanks to Walter
+   Bright.)
+ - Added some support for OpenBSD/ELF/Linux.  (Thanks to Suzuki Toshiya.)
+ - Added Jakub Jelinek's patch to use dl_iterate_phdr for dynamic library
+   traversal to dyn_load.c.  Changed it to weakly reference dl_iterate_phdr,
+   so that the old code is stilll used with old versions of glibc.
+ - Cleaned up feature test macros for various threads packages and
+   integrated (partially functional) FreeBSD threads code from Loren Rittle.
+   It's likely that the cleanup broke something, since it touched lots of
+   code.  It's also likelly that it fixed some unreported bugs in the
+   less common thread implementations, since some of the original code
+   didn't stand up to close scrutiny.  Support for the next pthreads
+   implementation should be easier to add.
  
 
 To do:
  - There seem to be outstanding issues on Solaris/X86, possibly with
    finding the data segment starting address.  Information/patches would
-   ne appreciated.
- - New_gc_alloc.h is apparently no longer compatible with the latest C++
-   standard library in gcc3.0.  (This isn't technically a bug, since it only
-   claimed compatibility with the SGI STL.  But we may need a new C++ STL
-   allocator interface.)
+   be appreciated.
  - Very large root set sizes (> 16 MB or so) could cause the collector
    to abort with an unexpected mark stack overflow.  (Thanks again to
    Peter Chubb.)  NOT YET FIXED.  Workaround is to increase the initial
diff --git a/dyn_load.c b/dyn_load.c
index 5a86cf6c..c970fa5a 100644
--- a/dyn_load.c
+++ b/dyn_load.c
@@ -26,15 +26,18 @@
  * None of this is safe with dlclose and incremental collection.
  * But then not much of anything is safe in the presence of dlclose.
  */
+#if defined(__linux__) && !defined(_GNU_SOURCE)
+    /* Can't test LINUX, since this must be define before other includes */
+#   define _GNU_SOURCE
+#endif
 #if !defined(MACOS) && !defined(_WIN32_WCE)
 #  include <sys/types.h>
 #endif
 #include "private/gc_priv.h"
 
-/* BTL: avoid circular redefinition of dlopen if SOLARIS_THREADS defined */
-# if (defined(LINUX_THREADS) || defined(SOLARIS_THREADS) \
-      || defined(HPUX_THREADS) || defined(IRIX_THREADS)) && defined(dlopen) \
-     && !defined(GC_USE_LD_WRAP)
+/* BTL: avoid circular redefinition of dlopen if GC_SOLARIS_THREADS defined */
+# if (defined(GC_PTHREADS) || defined(GC_SOLARIS_THREADS)) \
+      && defined(dlopen) && !defined(GC_USE_LD_WRAP)
     /* To support threads in Solaris, gc.h interposes on dlopen by       */
     /* defining "dlopen" to be "GC_dlopen", which is implemented below.  */
     /* However, both GC_FirstDLOpenedLinkMap() and GC_dlopen() use the   */
@@ -53,6 +56,7 @@
     !(defined(ALPHA) && defined(OSF1)) && \
     !defined(HPUX) && !(defined(LINUX) && defined(__ELF__)) && \
     !defined(RS6000) && !defined(SCO_ELF) && \
+    !(defined(FREEBSD) && defined(__ELF__)) && \
     !(defined(NETBSD) && defined(__ELF__)) && !defined(HURD)
  --> We only know how to find data segments of dynamic libraries for the
  --> above.  Additional SVR4 variants might not be too
@@ -124,7 +128,7 @@ GC_FirstDLOpenedLinkMap()
 
 #endif /* SUNOS5DL ... */
 
-/* BTL: added to fix circular dlopen definition if SOLARIS_THREADS defined */
+/* BTL: added to fix circular dlopen definition if GC_SOLARIS_THREADS defined */
 # if defined(GC_must_restore_redefined_dlopen)
 #   define dlopen GC_dlopen
 # endif
@@ -171,7 +175,7 @@ static ptr_t GC_first_common()
 
 # if defined(SUNOS4) || defined(SUNOS5DL)
 /* Add dynamic library data sections to the root set.		*/
-# if !defined(PCR) && !defined(SOLARIS_THREADS) && defined(THREADS)
+# if !defined(PCR) && !defined(GC_SOLARIS_THREADS) && defined(THREADS)
 #   ifndef SRC_M3
 	--> fix mutual exclusion with dlopen
 #   endif  /* We assume M3 programs don't call dlopen for now */
@@ -243,6 +247,7 @@ void GC_register_dynamic_libraries()
 # endif /* SUNOS */
 
 #if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \
+    (defined(FREEBSD) && defined(__ELF__)) || \
     (defined(NETBSD) && defined(__ELF__)) || defined(HURD)
 
 
@@ -417,13 +422,91 @@ static char *parse_map_entry(char *buf_ptr, word *start, word *end,
     return buf_ptr;
 }
 
-#else /* !USE_PROC_FOR_LIBRARIES */
+#endif /* USE_PROC_FOR_LIBRARIES */
+
+#if !defined(USE_PROC_FOR_LIBRARIES)
+/* The following is the preferred way to walk dynamic libraries	*/
+/* For glibc 2.2.4+.  Unfortunately, it doesn't work for older	*/
+/* versions.  Thanks to Jakub Jelinek for most of the code.	*/
+
+#include <stddef.h>
+#include <elf.h>
+#include <link.h>
+
+# if defined(LINUX) /* Are others OK here, too? */ \
+     && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
+         || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG))) 
+
+/* We have the header files for a glibc that includes dl_iterate_phdr.	*/
+/* It may still not be available in the library on the target system.   */
+/* Thus we also treat it as a weak symbol.				*/
+#define HAVE_DL_ITERATE_PHDR
+
+static int GC_register_dynlib_callback(info, size, ptr)
+     struct dl_phdr_info * info;
+     size_t size;
+     void * ptr;
+{
+  const ElfW(Phdr) * p;
+  char * start;
+  register int i;
+
+  /* Make sure struct dl_phdr_info is at least as big as we need.  */
+  if (size < offsetof (struct dl_phdr_info, dlpi_phnum)
+      + sizeof (info->dlpi_phnum))
+    return -1;
+
+  /* Skip the first object - it is the main program.  */
+  if (*(int *)ptr == 0)
+    {
+      *(int *)ptr = 1;
+      return 0;
+    }
+
+  p = info->dlpi_phdr;
+  for( i = 0; i < (int)(info->dlpi_phnum); ((i++),(p++)) ) {
+    switch( p->p_type ) {
+      case PT_LOAD:
+	{
+	  if( !(p->p_flags & PF_W) ) break;
+	  start = ((char *)(p->p_vaddr)) + info->dlpi_addr;
+	  GC_add_roots_inner(start, start + p->p_memsz, TRUE);
+	}
+      break;
+      default:
+	break;
+    }
+  }
+
+  return 0;
+}     
+
+/* Return TRUE if we succeed, FALSE if dl_iterate_phdr wasn't there. */
+
+#pragma weak dl_iterate_phdr
+
+GC_bool GC_register_dynamic_libraries_dl_iterate_phdr()
+{
+  int tmp = 0;
+
+  if (dl_iterate_phdr) {
+    dl_iterate_phdr(GC_register_dynlib_callback, &tmp);
+    return TRUE;
+  } else {
+    return FALSE;
+  }
+}
+
+# else /* !LINUX || version(glibc) < 2.2.4 */
 
 /* Dynamic loading code for Linux running ELF. Somewhat tested on
  * Linux/x86, untested but hopefully should work on Linux/Alpha. 
  * This code was derived from the Solaris/ELF support. Thanks to
  * whatever kind soul wrote that.  - Patrick Bridges */
 
+/* This doesn't necessarily work in all cases, e.g. with preloaded
+ * dynamic libraries.						*/
+
 #if defined(NETBSD)
 #  include <sys/exec_elf.h>
 #else
@@ -431,6 +514,8 @@ static char *parse_map_entry(char *buf_ptr, word *start, word *end,
 #endif
 #include <link.h>
 
+# endif
+
 /* Newer versions of Linux/Alpha and Linux/x86 define this macro.  We
  * define it for those older versions that don't.  */
 #  ifndef ElfW
@@ -472,9 +557,15 @@ GC_FirstDLOpenedLinkMap()
 
 void GC_register_dynamic_libraries()
 {
-  struct link_map *lm = GC_FirstDLOpenedLinkMap();
+  struct link_map *lm;
   
 
+# ifdef HAVE_DL_ITERATE_PHDR
+    if (GC_register_dynamic_libraries_dl_iterate_phdr()) {
+	return;
+    }
+# endif
+  lm = GC_FirstDLOpenedLinkMap();
   for (lm = GC_FirstDLOpenedLinkMap();
        lm != (struct link_map *) 0;  lm = lm->l_next)
     {
@@ -649,7 +740,7 @@ void GC_register_dynamic_libraries()
   
   extern GC_bool GC_is_heap_base (ptr_t p);
 
-# ifdef WIN32_THREADS
+# ifdef GC_WIN32_THREADS
     extern void GC_get_next_stack(char *start, char **lo, char **hi);
     void GC_cond_add_roots(char *base, char * limit)
     {
@@ -864,7 +955,7 @@ void GC_register_dynamic_libraries()
 
       /* Check if this is the end of the list or if some error occured */
         if (status != 0) {
-#	 ifdef HPUX_THREADS
+#	 ifdef GC_HPUX_THREADS
 	   /* I've seen errno values of 0.  The man page is not clear	*/
 	   /* as to whether errno should get set on a -1 return.	*/
 	   break;
diff --git a/finalize.c b/finalize.c
index 229d8286..d69ba6f1 100644
--- a/finalize.c
+++ b/finalize.c
@@ -207,7 +207,7 @@ signed_word * log_size_ptr;
 	UNLOCK();
     	ENABLE_SIGNALS();
 #     endif
-      new_dl == GC_oom_fn(sizeof(struct disappearing_link));
+      new_dl = GC_oom_fn(sizeof(struct disappearing_link));
       if (0 == new_dl) {
 	GC_finalization_failures++;
 	return(0);
@@ -433,7 +433,7 @@ finalization_mark_proc * mp;
 	UNLOCK();
     	ENABLE_SIGNALS();
 #     endif
-      new_fo == GC_oom_fn(sizeof(struct finalizable_object));
+      new_fo = GC_oom_fn(sizeof(struct finalizable_object));
       if (0 == new_fo) {
 	GC_finalization_failures++;
 	return;
diff --git a/gc.mak b/gc.mak
index c90584ec..5f0b5462 100644
--- a/gc.mak
+++ b/gc.mak
@@ -114,10 +114,10 @@ CLEAN :
 
 CPP=cl.exe
 # ADD BASE CPP /nologo /MT /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /YX /c
-# ADD CPP /nologo /MD /W3 /GX /O2 /I include /D "NDEBUG" /D "SILENT" /D "GC_BUILD" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "WIN32_THREADS" /FR /YX /c
+# ADD CPP /nologo /MD /W3 /GX /O2 /I include /D "NDEBUG" /D "SILENT" /D "GC_BUILD" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "GC_WIN32_THREADS" /FR /YX /c
 CPP_PROJ=/nologo /MD /W3 /GX /O2 /I include /D "NDEBUG" /D "SILENT" /D "GC_BUILD" /D\
  "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D\
- "WIN32_THREADS" /FR"$(INTDIR)/" /Fp"$(INTDIR)/gc.pch" /YX /Fo"$(INTDIR)/" /c 
+ "GC_WIN32_THREADS" /FR"$(INTDIR)/" /Fp"$(INTDIR)/gc.pch" /YX /Fo"$(INTDIR)/" /c 
 CPP_OBJS=.\Release/
 CPP_SBRS=.\Release/
 
@@ -296,10 +296,10 @@ CLEAN :
 
 CPP=cl.exe
 # ADD BASE CPP /nologo /MTd /W3 /Gm /GX /Zi /Od /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /YX /c
-# ADD CPP /nologo /MDd /W3 /Gm /GX /Zi /Od /I include /D "_DEBUG" /D "SILENT" /D "GC_BUILD" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "WIN32_THREADS" /FR /YX /c
+# ADD CPP /nologo /MDd /W3 /Gm /GX /Zi /Od /I include /D "_DEBUG" /D "SILENT" /D "GC_BUILD" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "GC_WIN32_THREADS" /FR /YX /c
 CPP_PROJ=/nologo /MDd /W3 /Gm /GX /Zi /Od /I include /D "_DEBUG" /D "SILENT" /D "GC_BUILD"\
  /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D\
- "WIN32_THREADS" /FR"$(INTDIR)/" /Fp"$(INTDIR)/gc.pch" /YX /Fo"$(INTDIR)/"\
+ "GC_WIN32_THREADS" /FR"$(INTDIR)/" /Fp"$(INTDIR)/gc.pch" /YX /Fo"$(INTDIR)/"\
  /Fd"$(INTDIR)/" /c 
 CPP_OBJS=.\Debug/
 CPP_SBRS=.\Debug/
@@ -430,9 +430,9 @@ test.c : tests\test.c
 
 CPP=cl.exe
 # ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /YX /c
-# ADD CPP /nologo /MD /W3 /GX /O2 /I include /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "WIN32_THREADS" /YX /c
+# ADD CPP /nologo /MD /W3 /GX /O2 /I include /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "GC_WIN32_THREADS" /YX /c
 CPP_PROJ=/nologo /MD /W3 /GX /O2 /I include /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D\
- "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "WIN32_THREADS"\
+ "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "GC_WIN32_THREADS"\
  /Fp"$(INTDIR)/gctest.pch" /YX /Fo"$(INTDIR)/" /c 
 CPP_OBJS=.\gctest\Release/
 CPP_SBRS=.\.
@@ -516,9 +516,9 @@ CLEAN :
 
 CPP=cl.exe
 # ADD BASE CPP /nologo /W3 /Gm /GX /Zi /Od /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /YX /c
-# ADD CPP /nologo /MDd /W3 /Gm /GX /Zi /Od /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "WIN32_THREADS" /FR /YX /c
+# ADD CPP /nologo /MDd /W3 /Gm /GX /Zi /Od /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "GC_WIN32_THREADS" /FR /YX /c
 CPP_PROJ=/nologo /MDd /W3 /Gm /GX /Zi /Od /I include /D "_DEBUG" /D "WIN32" /D "_WINDOWS"\
- /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "WIN32_THREADS" /FR"$(INTDIR)/"\
+ /D "ALL_INTERIOR_POINTERS" /D "__STDC__" /D "GC_WIN32_THREADS" /FR"$(INTDIR)/"\
  /Fp"$(INTDIR)/gctest.pch" /YX /Fo"$(INTDIR)/" /Fd"$(INTDIR)/" /c 
 CPP_OBJS=.\gctest\Debug/
 CPP_SBRS=.\gctest\Debug/
diff --git a/gc_dlopen.c b/gc_dlopen.c
index 943c4b0c..eafaa2b1 100644
--- a/gc_dlopen.c
+++ b/gc_dlopen.c
@@ -24,8 +24,7 @@
 
 #include "private/gc_priv.h"
 
-# if defined(LINUX_THREADS) || defined(SOLARIS_THREADS) \
-     || defined(HPUX_THREADS) || defined(IRIX_THREADS)
+# if defined(GC_PTHREADS) || defined(GC_SOLARIS_THREADS)
 
 # if defined(dlopen) && !defined(GC_USE_LD_WRAP)
     /* To support various threads pkgs, gc.h interposes on dlopen by     */
@@ -90,7 +89,7 @@
 #   endif
     return(result);
 }
-# endif  /* LINUX_THREADS || SOLARIS_THREADS || ... */
+# endif  /* GC_PTHREADS || GC_SOLARIS_THREADS ... */
 
 
 
diff --git a/ia64_save_regs_in_stack.s b/ia64_save_regs_in_stack.s
new file mode 100644
index 00000000..3b18c084
--- /dev/null
+++ b/ia64_save_regs_in_stack.s
@@ -0,0 +1,12 @@
+        .text
+        .align 16
+        .global GC_save_regs_in_stack
+        .proc GC_save_regs_in_stack
+GC_save_regs_in_stack:
+        .body
+        flushrs
+        ;;
+        mov r8=ar.bsp
+        br.ret.sptk.few rp
+        .endp GC_save_regs_in_stack
+
diff --git a/include/gc.h b/include/gc.h
index aaf29ee3..8ac709b9 100644
--- a/include/gc.h
+++ b/include/gc.h
@@ -30,13 +30,9 @@
 
 # define _GC_H
 
-#if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS)
-#   define SOLARIS_THREADS
-#endif
-
 /*
  * Some tests for old macros.  These violate our namespace rules and will
- * disappear shortly.
+ * disappear shortly.  Use the GC_ names.
  */
 #if defined(SOLARIS_THREADS) || defined(_SOLARIS_THREADS)
 # define GC_SOLARIS_THREADS
@@ -72,6 +68,16 @@
 	/* depend on this were previously included.			*/
 #endif
 
+#if defined(GC_SOLARIS_PTHREADS) && !defined(GC_SOLARIS_THREADS)
+#   define GC_SOLARIS_THREADS
+#endif
+
+# if defined(GC_SOLARIS_PTHREADS) || defined(GC_FREEBSD_THREADS) || \
+	defined(GC_IRIX_THREADS) || defined(GC_LINUX_THREADS) || \
+	defined(GC_HPUX_THREADS) || defined(GC_OSF1_THREADS)
+#   define GC_PTHREADS
+# endif
+
 # define __GC
 # include <stddef.h>
 # ifdef _WIN32_WCE
@@ -80,7 +86,7 @@
     typedef long ptrdiff_t;	/* ptrdiff_t is not defined */
 # endif
 
-#if defined(__MINGW32__) && defined(WIN32_THREADS)
+#if defined(__MINGW32__) && defined(GC_WIN32_THREADS)
 # ifdef GC_BUILD
 #   define GC_API __declspec(dllexport)
 # else
@@ -815,16 +821,12 @@ GC_API void (*GC_is_visible_print_proc)
 /* thread library calls.  We do that here by macro defining them.	*/
 
 #if !defined(GC_USE_LD_WRAP) && \
-    (defined(GC_LINUX_THREADS) || defined(GC_HPUX_THREADS) || \
-     defined(GC_IRIX_THREADS) || defined(GC_SOLARIS_PTHREADS) || \
-     defined(GC_SOLARIS_THREADS) || defined(GC_OSF1_THREADS))
+    (defined(GC_PTHREADS) || defined(GC_SOLARIS_THREADS))
 # include "gc_pthread_redirects.h"
 #endif
 
 # if defined(PCR) || defined(GC_SOLARIS_THREADS) || \
-     defined(GC_SOLARIS_PTHREADS) || defined(GC_WIN32_THREADS) || \
-     defined(GC_IRIX_THREADS) || defined(GC_LINUX_THREADS) || \
-     defined(GC_HPUX_THREADS)
+     defined(GC_PTHREADS) || defined(GC_WIN32_THREADS)
    	/* Any flavor of threads except SRC_M3.	*/
 /* This returns a list of objects, linked through their first		*/
 /* word.  Its use can greatly reduce lock contention problems, since	*/
@@ -839,7 +841,7 @@ extern void GC_thr_init();	/* Needed for Solaris/X86	*/
 
 #endif /* THREADS && !SRC_M3 */
 
-#if defined(WIN32_THREADS) && defined(_WIN32_WCE)
+#if defined(GC_WIN32_THREADS) && defined(_WIN32_WCE)
 # include <windows.h>
 
   /*
diff --git a/include/gc_gcj.h b/include/gc_gcj.h
index 9123a28b..5e932afe 100644
--- a/include/gc_gcj.h
+++ b/include/gc_gcj.h
@@ -47,8 +47,6 @@
 /* The following allocators signal an out of memory condition with	*/
 /* return GC_oom_fn(bytes);						*/
 
-extern void * (*GC_oom_action)(void);
-
 /* The following function must be called before the gcj allocators	*/
 /* can be invoked.							*/
 /* mp_index and mp are the index and mark_proc (see gc_mark.h)		*/
diff --git a/include/new_gc_alloc.h b/include/new_gc_alloc.h
index 1187f0b6..aad94465 100644
--- a/include/new_gc_alloc.h
+++ b/include/new_gc_alloc.h
@@ -50,7 +50,20 @@
 #ifndef GC_ALLOC_H
 
 #include "gc.h"
-#include <stack>  // A more portable way to get stl_alloc.h .
+
+#if (__GNUC__ < 3)
+# include <stack>  // A more portable way to get stl_alloc.h .
+#else
+# include <bits/stl_alloc.h>
+# ifndef __STL_BEGIN_NAMESPACE
+# define __STL_BEGIN_NAMESPACE namespace std {
+# define __STL_END_NAMESPACE };
+# endif
+#ifndef __STL_USE_STD_ALLOCATORS
+#define __STL_USE_STD_ALLOCATORS
+#endif
+#endif
+
 
 #define GC_ALLOC_H
 
diff --git a/include/private/gc_locks.h b/include/private/gc_locks.h
index eed9f105..5ea1e543 100644
--- a/include/private/gc_locks.h
+++ b/include/private/gc_locks.h
@@ -76,7 +76,7 @@
 #    define LOCK() RT0u__inCritical++
 #    define UNLOCK() RT0u__inCritical--
 #  endif
-#  ifdef SOLARIS_THREADS
+#  ifdef GC_SOLARIS_THREADS
 #    include <thread.h>
 #    include <signal.h>
      extern mutex_t GC_allocate_ml;
@@ -261,8 +261,8 @@
 #    define USE_PTHREAD_LOCKS
 #  endif
 
-#  if defined(LINUX_THREADS) || defined(OSF1_THREADS) \
-      || defined(HPUX_THREADS)
+#  if defined(GC_PTHREADS) && !defined(GC_SOLARIS_THREADS) \
+      && !defined(GC_IRIX_THREADS)
 #    define NO_THREAD (pthread_t)(-1)
 #    include <pthread.h>
 #    if defined(PARALLEL_MARK) 
@@ -412,8 +412,8 @@
 #   ifdef GC_ASSERTIONS
       extern pthread_t GC_mark_lock_holder;
 #   endif
-#  endif /* LINUX_THREADS || OSF1_THREADS  || HPUX_THREADS */
-#  if defined(IRIX_THREADS)
+#  endif /* GC_PTHREADS with linux_threads.c implementation */
+#  if defined(GC_IRIX_THREADS)
 #    include <pthread.h>
      /* This probably should never be included, but I can't test	*/
      /* on Irix anymore.						*/
@@ -439,8 +439,8 @@
 		    GC_collecting = 1; \
 		}
 #    define EXIT_GC() GC_collecting = 0;
-#  endif /* IRIX_THREADS */
-#  ifdef WIN32_THREADS
+#  endif /* GC_IRIX_THREADS */
+#  ifdef GC_WIN32_THREADS
 #    include <windows.h>
      GC_API CRITICAL_SECTION GC_allocate_ml;
 #    define LOCK() EnterCriticalSection(&GC_allocate_ml);
diff --git a/include/private/gc_priv.h b/include/private/gc_priv.h
index 5135e3e9..ad204e99 100644
--- a/include/private/gc_priv.h
+++ b/include/private/gc_priv.h
@@ -443,18 +443,21 @@ struct hblk;	/* See below.	*/
 /* clear on that point).  Standard malloc implementations are usually	*/
 /* neither interruptable nor thread-safe, and thus correspond to	*/
 /* empty definitions.							*/
+/* It probably doesn't make any sense to declare these to be nonempty	*/
+/* if the code is being optimized, since signal safety relies on some	*/
+/* ordering constraints that are typically not obeyed by optimizing	*/
+/* compilers.								*/
 # ifdef PCR
 #   define DISABLE_SIGNALS() \
 		 PCR_Th_SetSigMask(PCR_allSigsBlocked,&GC_old_sig_mask)
 #   define ENABLE_SIGNALS() \
 		PCR_Th_SetSigMask(&GC_old_sig_mask, NIL)
 # else
-#   if defined(SRC_M3) || defined(AMIGA) || defined(SOLARIS_THREADS) \
+#   if defined(THREADS) || defined(AMIGA)  \
 	|| defined(MSWIN32) || defined(MSWINCE) || defined(MACOS) \
-	|| defined(DJGPP) || defined(NO_SIGNALS) || defined(IRIX_THREADS) \
-	|| defined(LINUX_THREADS) 
+	|| defined(DJGPP) || defined(NO_SIGNALS) 
 			/* Also useful for debugging.		*/
-	/* Should probably use thr_sigsetmask for SOLARIS_THREADS. */
+	/* Should probably use thr_sigsetmask for GC_SOLARIS_THREADS. */
 #     define DISABLE_SIGNALS()
 #     define ENABLE_SIGNALS()
 #   else
@@ -479,9 +482,8 @@ struct hblk;	/* See below.	*/
  				   PCR_allSigsBlocked, \
  				   PCR_waitForever);
 # else
-#   if defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \
-	|| defined(IRIX_THREADS) || defined(LINUX_THREADS) \
-	|| defined(HPUX_THREADS)
+#   if defined(GC_SOLARIS_THREADS) || defined(GC_WIN32_THREADS) \
+	|| defined(GC_PTHREADS)
       void GC_stop_world();
       void GC_start_world();
 #     define STOP_WORLD() GC_stop_world()
@@ -566,7 +568,8 @@ extern GC_warn_proc GC_current_warn_proc;
 # ifdef SMALL_CONFIG
 #   define CPP_LOG_HBLKSIZE 10
 # else
-#   if CPP_WORDSZ == 32
+#   if (CPP_WORDSZ == 32) || (defined(HPUX) && defined(HP_PA))
+      /* HPUX/PA seems to use 4K pages with the 64 bit ABI */
 #     define CPP_LOG_HBLKSIZE 12
 #   else
 #     define CPP_LOG_HBLKSIZE 13
@@ -1903,8 +1906,7 @@ void GC_err_puts GC_PROTO((GC_CONST char *s));
 		/* some other reason.					*/
 # endif /* PARALLEL_MARK */
 
-# if defined(LINUX_THREADS) || defined(IRIX_THREADS) \
-     || defined(HPUX_THREADS) || defined(OSF1_THREADS)
+# if defined(GC_PTHREADS) && !defined(GC_SOLARIS_THREADS)
   /* We define the thread suspension signal here, so that we can refer	*/
   /* to it in the dirty bit implementation, if necessary.  Ideally we	*/
   /* would allocate a (real-time ?) signal using the standard mechanism.*/
@@ -1912,16 +1914,16 @@ void GC_err_puts GC_PROTO((GC_CONST char *s));
   /* in Linux glibc, but it's not exported.)  Thus we continue to use	*/
   /* the same hard-coded signals we've always used.			*/
 #  if !defined(SIG_SUSPEND)
-#   if defined(LINUX_THREADS)
+#   if defined(GC_LINUX_THREADS)
 #    if defined(SPARC) && !defined(SIGPWR)
        /* SPARC/Linux doesn't properly define SIGPWR in <signal.h>.
         * It is aliased to SIGLOST in asm/signal.h, though.		*/
 #      define SIG_SUSPEND SIGLOST
 #    else
-       /* Linuxthreads uses SIGUSR1 and SIGUSR2.			*/
+       /* Linuxthreads itself uses SIGUSR1 and SIGUSR2.			*/
 #      define SIG_SUSPEND SIGPWR
 #    endif
-#   else  /* !LINUX_THREADS */
+#   else  /* !GC_LINUX_THREADS */
 #    define SIG_SUSPEND _SIGRTMIN + 6
 #   endif
 #  endif /* !SIG_SUSPEND */
diff --git a/include/private/gcconfig.h b/include/private/gcconfig.h
index a0d12c84..6f25d305 100644
--- a/include/private/gcconfig.h
+++ b/include/private/gcconfig.h
@@ -33,6 +33,11 @@
 #    define NETBSD
 # endif
 
+/* And one for OpenBSD: */
+# if defined(__OpenBSD__)
+#    define OPENBSD
+# endif
+
 /* Determine the machine type: */
 # if defined(sun) && defined(mc68000)
 #    define M68K
@@ -44,25 +49,23 @@
 #    define HP
 #    define mach_type_known
 # endif
-# if defined(__OpenBSD__) && defined(m68k)
+# if defined(OPENBSD) && defined(m68k)
 #    define M68K
-#    define OPENBSD
 #    define mach_type_known
 # endif
-# if defined(__OpenBSD__) && defined(__sparc__)
+# if defined(OPENBSD) && defined(__sparc__)
 #    define SPARC
-#    define OPENBSD
 #    define mach_type_known
 # endif
-# if defined(__NetBSD__) && defined(m68k)
+# if defined(NETBSD) && defined(m68k)
 #    define M68K
 #    define mach_type_known
 # endif
-# if defined(__NetBSD__) && defined(__powerpc__)
+# if defined(NETBSD) && defined(__powerpc__)
 #    define POWERPC
 #    define mach_type_known
 # endif
-# if defined(__NetBSD__) && defined(__arm32__)
+# if defined(NETBSD) && defined(__arm32__)
 #    define ARM32
 #    define mach_type_known
 # endif
@@ -161,6 +164,11 @@
 #   endif
 #   define mach_type_known
 # endif
+# if defined(__ia64) && defined(_HPUX_SOURCE)
+#   define IA64
+#   define HPUX
+#   define mach_type_known
+# endif
 # if defined(__BEOS__) && defined(_X86_)
 #    define I386
 #    define BEOS
@@ -196,7 +204,7 @@
 # endif
 # if defined(__alpha) || defined(__alpha__)
 #   define ALPHA
-#   if !defined(LINUX) && !defined(NETBSD)
+#   if !defined(LINUX) && !defined(NETBSD) && !defined(OPENBSD)
 #     define OSF1	/* a.k.a Digital Unix */
 #   endif
 #   define mach_type_known
@@ -386,7 +394,7 @@
                     /*		   RS6000     ==> IBM RS/6000 AIX3.X	*/
                     /*		   RT	      ==> IBM PC/RT		*/
                     /*		   HP_PA      ==> HP9000/700 & /800	*/
-                    /*				  HP/UX, LINUX			*/
+                    /*				  HP/UX, LINUX		*/
 		    /*		   SPARC      ==> SPARC	v7/v8/v9	*/
 		    /*			(SUNOS4, SUNOS5, LINUX,		*/
 		    /*			 DRSNX variants)		*/
@@ -398,8 +406,11 @@
 		    /* 			running Amdahl UTS4		*/
 		    /*			or a 390 running LINUX		*/
 		    /* 		   ARM32      ==> Intel StrongARM	*/
-		    /* 		   IA64	      ==> Intel IA64		*/
+		    /* 		   IA64	      ==> Intel IPF		*/
 		    /*				  (e.g. Itanium)	*/
+		    /*			(LINUX and HPUX)	        */
+		    /* 		   IA64_32    ==> IA64 w/32 bit ABI	*/
+		    /* 			(HPUX)				*/
 		    /*		   SH	      ==> Hitachi SuperH	*/
 		    /* 			(LINUX & MSWINCE)		*/
 
@@ -533,7 +544,7 @@
 #   ifdef LINUX
 #       define OS_TYPE "LINUX"
 #       define STACKBOTTOM ((ptr_t)0xf0000000)
-#       define MPROTECT_VDB
+/* #       define MPROTECT_VDB - Reported to not work  9/17/01 */
 #       ifdef __ELF__
 #            define DYNAMIC_LOADING
 #	     include <features.h>
@@ -888,7 +899,7 @@
 	  /* with 2GB physical memory will usually move the user	*/
 	  /* address space limit, and hence initial SP to 0x80000000.	*/
 #       endif
-#       if !defined(LINUX_THREADS) || !defined(REDIRECT_MALLOC)
+#       if !defined(GC_LINUX_THREADS) || !defined(REDIRECT_MALLOC)
 #	    define MPROTECT_VDB
 #	else
 	    /* We seem to get random errors in incremental mode,	*/
@@ -1005,6 +1016,9 @@
 #	define OS_TYPE "FREEBSD"
 #	define MPROTECT_VDB
 #	define FREEBSD_STACKBOTTOM
+#	ifdef __ELF__
+#	    define DYNAMIC_LOADING
+#	endif
 #   endif
 #   ifdef NETBSD
 #	define OS_TYPE "NETBSD"
@@ -1161,7 +1175,6 @@
 
 # ifdef HP_PA
 #   define MACH_TYPE "HP_PA"
-#   define OS_TYPE "HPUX"
 #   ifdef __LP64__
 #     define CPP_WORDSZ 64
 #     define ALIGNMENT 8
@@ -1170,8 +1183,7 @@
 #     define ALIGNMENT 4
 #     define ALIGN_DOUBLE
 #   endif
-#   if !defined(GC_HPUX_THREADS) && !defined(HPUX_THREADS) \
-       && !defined(GC_LINUX_THREADS) && !defined(LINUX_THREADS)
+#   if !defined(GC_HPUX_THREADS) && !defined(GC_LINUX_THREADS)
 #     ifndef LINUX /* For now. */
 #       define MPROTECT_VDB
 #     endif
@@ -1186,6 +1198,7 @@
 #   endif
 #   define STACK_GROWS_UP
 #   ifdef HPUX
+#     define OS_TYPE "HPUX"
       extern int __data_start;
 #     define DATASTART ((ptr_t)(&__data_start))
 #     if 0
@@ -1242,6 +1255,19 @@
 #   	define CPP_WORDSZ 64
 #       define DYNAMIC_LOADING
 #   endif
+#   ifdef OPENBSD
+#	define OS_TYPE "OPENBSD"
+#	define HEURISTIC2
+#   	define CPP_WORDSZ 64
+#   	ifdef __ELF__	/* since OpenBSD/Alpha 2.9 */
+#	   define DATASTART GC_data_start
+#   	   define ELFCLASS32 32
+#   	   define ELFCLASS64 64
+#   	   define ELF_CLASS ELFCLASS64
+#       else		/* ECOFF, until OpenBSD/Alpha 2.7 */
+#   	   define DATASTART ((ptr_t) 0x140000000)
+#   	endif
+#   endif
 #   ifdef OSF1
 #	define OS_TYPE "OSF1"
 #   	define DATASTART ((ptr_t) 0x140000000)
@@ -1284,9 +1310,6 @@
 
 # ifdef IA64
 #   define MACH_TYPE "IA64"
-#   define ALIGN_DOUBLE
-	/* Requires 16 byte alignment for malloc */
-#   define ALIGNMENT 8
 #   define USE_GENERIC_PUSH_REGS
 	/* We need to get preserved registers in addition to register   */
 	/* windows.   That's easiest to do with setjmp.			*/
@@ -1296,11 +1319,47 @@
 	    /* setting mark bits.					*/
 #   endif
 #   ifdef HPUX
-	--> needs work
+#	ifdef _ILP32
+#	  define CPP_WORDSZ 32
+#         define ALIGN_DOUBLE
+	    /* Requires 8 byte alignment for malloc */
+#   	  define ALIGNMENT 4
+#       else
+#	  ifndef _LP64
+		---> unknown ABI
+#         endif
+#	  define CPP_WORDSZ 64
+#   	  define ALIGN_DOUBLE
+	    /* Requires 16 byte alignment for malloc */
+#         define ALIGNMENT 8
+#       endif
+#       define OS_TYPE "HPUX"	
+        extern int __data_start;
+#       define DATASTART ((ptr_t)(&__data_start))
+        /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2	*/
+        /* to this.  Note that the GC must be initialized before the	*/
+    	/* first putenv call.						*/
+	extern char ** environ;
+#       define STACKBOTTOM ((ptr_t)environ)
+#       define DYNAMIC_LOADING
+#       include <unistd.h>
+#       define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
+ 	/* The following was empirically determined, and is probably	*/
+	/* not very robust.						*/
+	/* Note that the backing store base seems to be at a nice 	*/
+	/* address minus one page.					*/
+#	define BACKING_STORE_DISPLACEMENT 0x1000000
+#	define BACKING_STORE_ALIGNMENT 0x1000
+#       define BACKING_STORE_BASE \
+	  (ptr_t)(((word)GC_stackbottom - BACKING_STORE_DISPLACEMENT - 1) \
+			& ~(BACKING_STORE_ALIGNMENT - 1))
 #   endif
 #   ifdef LINUX
+#   	define CPP_WORDSZ 64
+#   	define ALIGN_DOUBLE
+	  /* Requires 16 byte alignment for malloc */
+#   	define ALIGNMENT 8
 #       define OS_TYPE "LINUX"
-#       define CPP_WORDSZ 64
 	/* The following works on NUE and older kernels:	*/
 /* #       define STACKBOTTOM ((ptr_t) 0xa000000000000000l)	*/
 	/* This does not work on NUE:				*/
@@ -1581,57 +1640,33 @@
 	((word*)x)[1] = 0;
 # endif /* CLEAR_DOUBLE */
 
-/* Internally to the collector we test only the XXX_THREADS macros	*/
-/* not the GC_XXX_THREADS versions.  Here we make sure the latter	*/
-/* are treated as equivalent.						*/
-#if defined(GC_SOLARIS_THREADS) && !defined(_SOLARIS_THREADS)
-#   define _SOLARIS_THREADS
-#endif
-#if defined(GC_SOLARIS_THREADS) && !defined(_SOLARIS_PTHREADS)
-#   define _SOLARIS_PTHREADS
-#endif
-#if defined(GC_IRIX_THREADS) && !defined(IRIX_THREADS)
-#   define IRIX_THREADS
-#endif
-#if defined(GC_LINUX_THREADS) && !defined(LINUX_THREADS)
-#   define LINUX_THREADS
-#endif
-#if defined(GC_WIN32_THREADS) && !defined(WIN32_THREADS)
-#   define WIN32_THREADS
-#endif
-#if defined(GC_HPUX_THREADS) && !defined(HPUX_THREADS)
-#   define HPUX_THREADS
-#endif
-#if defined(GC_OSF1_THREADS) && !defined(OSF1_THREADS)
-#   define OSF1_THREADS
-#endif
-
-/* Internally we use SOLARIS_THREADS to test for either old or pthreads. */
-# if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS)
-#   define SOLARIS_THREADS
+/* Internally we use GC_SOLARIS_THREADS to test for either old or pthreads. */
+# if defined(GC_SOLARIS_PTHREADS) && !defined(GC_SOLARIS_THREADS)
+#   define GC_SOLARIS_THREADS
 # endif
-# if defined(IRIX_THREADS) && !defined(IRIX5)
+
+# if defined(GC_IRIX_THREADS) && !defined(IRIX5)
 --> inconsistent configuration
 # endif
-# if defined(LINUX_THREADS) && !defined(LINUX)
+# if defined(GC_LINUX_THREADS) && !defined(LINUX)
 --> inconsistent configuration
 # endif
-# if defined(SOLARIS_THREADS) && !defined(SUNOS5)
+# if defined(GC_SOLARIS_THREADS) && !defined(SUNOS5)
 --> inconsistent configuration
 # endif
-# if defined(HPUX_THREADS) && !defined(HPUX)
+# if defined(GC_HPUX_THREADS) && !defined(HPUX)
 --> inconsistent configuration
 # endif
-# if defined(WIN32_THREADS) && !defined(MSWIN32)
-    /* Ideally CYGWIN32 should work, in addition to MSWIN32.  I suspect the necessary code	*/
-    /* is mostly there, but nobody has actually made sure the right combination of pieces is	*/
-    /* compiled in, etc.									*/
+# if defined(GC_WIN32_THREADS) && !defined(MSWIN32)
+    /* Ideally CYGWIN32 should work, in addition to MSWIN32.  I suspect	*/
+    /* the necessary code is mostly there, but nobody has actually made */
+    /* sure the right combination of pieces is compiled in, etc.	*/
 --> inconsistent configuration
 # endif
+
 # if defined(PCR) || defined(SRC_M3) || \
-	defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
-	defined(IRIX_THREADS) || defined(LINUX_THREADS) || \
-	defined(HPUX_THREADS) || defined(OSF1_THREADS)
+	defined(GC_SOLARIS_THREADS) || defined(GC_WIN32_THREADS) || \
+	defined(GC_PTHREADS)
 #   define THREADS
 # endif
 
diff --git a/irix_threads.c b/irix_threads.c
index 12aba546..c894a310 100644
--- a/irix_threads.c
+++ b/irix_threads.c
@@ -21,11 +21,11 @@
  * HP/UX 11.
  *
  * Note that there is a lot of code duplication between linux_threads.c
- * and hpux_irix_threads.c; any changes made here may need to be reflected
+ * and irix_threads.c; any changes made here may need to be reflected
  * there too.
  */
 
-# if defined(GC_IRIX_THREADS) || defined(IRIX_THREADS)
+# if defined(GC_IRIX_THREADS)
 
 # include "private/gc_priv.h"
 # include <pthread.h>
@@ -725,5 +725,5 @@ yield:
   int GC_no_Irix_threads;
 #endif
 
-# endif /* IRIX_THREADS */
+# endif /* GC_IRIX_THREADS */
 
diff --git a/linux_threads.c b/linux_threads.c
index 074be891..7958ed9b 100644
--- a/linux_threads.c
+++ b/linux_threads.c
@@ -50,13 +50,14 @@
 
 /* ANSI C requires that a compilation unit contains something */
 
-# if defined(GC_LINUX_THREADS) || defined(LINUX_THREADS) \
-     || defined(GC_HPUX_THREADS) || defined(HPUX_THREADS) \
-     || defined(GC_OSF1_THREADS) || defined(OSF1_THREADS) \
+# include "gc.h"
+
+# if defined(GC_PTHREADS) && !defined(GC_SOLARIS_THREADS) \
+     && !defined(GC_IRIX_THREADS)
 
 # include "private/gc_priv.h"
 
-# if defined(HPUX_THREADS) && !defined(USE_PTHREAD_SPECIFIC) \
+# if defined(GC_HPUX_THREADS) && !defined(USE_PTHREAD_SPECIFIC) \
      && !defined(USE_HPUX_TLS)
 #   define USE_HPUX_TLS
 # endif
@@ -449,7 +450,7 @@ GC_PTR GC_local_gcj_malloc(size_t bytes,
  */
 
 #ifndef SIG_THR_RESTART
-#  if defined(HPUX_THREADS) || defined(GC_OSF1_THREADS)
+#  if defined(GC_HPUX_THREADS) || defined(GC_OSF1_THREADS)
 #   define SIG_THR_RESTART _SIGRTMIN + 5
 #  else
 #   define SIG_THR_RESTART SIGXCPU
@@ -458,16 +459,19 @@ GC_PTR GC_local_gcj_malloc(size_t bytes,
 
 sem_t GC_suspend_ack_sem;
 
-#if !defined(HPUX_THREADS) && !defined(GC_OSF1_THREADS)
+#if 0
 /*
 To make sure that we're using LinuxThreads and not some other thread
 package, we generate a dummy reference to `pthread_kill_other_threads_np'
 (was `__pthread_initial_thread_bos' but that disappeared),
 which is a symbol defined in LinuxThreads, but (hopefully) not in other
 thread packages.
+
+We no longer do this, since this code is now portable enough that it might
+actually work for something else.
 */
 void (*dummy_var_to_force_linux_threads)() = pthread_kill_other_threads_np;
-#endif /* !HPUX_THREADS */
+#endif /* 0 */
 
 #if defined(SPARC) || defined(IA64)
   extern word GC_save_regs_in_stack();
@@ -530,6 +534,24 @@ static void start_mark_threads()
 	
     if (0 != pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED))
 	ABORT("pthread_attr_setdetachstate failed");
+
+#   ifdef HPUX
+      /* Default stack size is usually too small: fix it. */
+      /* Otherwise marker threads or GC may run out of	  */
+      /* space.						  */
+#     define MIN_STACK_SIZE (8*HBLKSIZE*sizeof(word))
+      {
+	size_t old_size;
+	int code;
+
+        if (pthread_attr_getstacksize(&attr, &old_size) != 0)
+	  ABORT("pthread_attr_getstacksize failed\n");
+	if (old_size < MIN_STACK_SIZE) {
+	  if (pthread_attr_setstacksize(&attr, MIN_STACK_SIZE) != 0)
+	    ABORT("pthread_attr_getstacksize failed\n");
+	}
+      }
+#   endif /* HPUX */
 #   ifdef CONDPRINT
       if (GC_print_stats) {
 	GC_printf1("Starting %ld marker threads\n", GC_markers - 1);
@@ -969,7 +991,7 @@ int GC_segment_is_thread_stack(ptr_t lo, ptr_t hi)
 }
 #endif /* USE_PROC_FOR_LIBRARIES */
 
-#ifdef LINUX_THREADS
+#ifdef GC_LINUX_THREADS
 /* Return the number of processors, or i<= 0 if it can't be determined.	*/
 int GC_get_nprocs()
 {
@@ -1005,7 +1027,7 @@ int GC_get_nprocs()
     }
     return result;
 }
-#endif /* LINUX_THREADS */
+#endif /* GC_LINUX_THREADS */
 
 /* We hold the allocation lock.	*/
 void GC_thr_init()
@@ -1063,13 +1085,13 @@ void GC_thr_init()
 	if (nprocs_string != NULL) GC_nprocs = atoi(nprocs_string);
       }
       if (GC_nprocs <= 0) {
-#       if defined(HPUX_THREADS)
+#       if defined(GC_HPUX_THREADS)
 	  GC_nprocs = pthread_num_processors_np();
 #       endif
-#       if defined(OSF1_THREADS)
+#       if defined(GC_OSF1_THREADS) || defined(GC_FREEBSD_THREADS)
           GC_nprocs = 1;
 #       endif
-#	ifdef LINUX_THREADS
+#	if defined(GC_LINUX_THREADS)
           GC_nprocs = GC_get_nprocs();
 #	endif
       }
@@ -1584,7 +1606,7 @@ void GC_lock()
   pthread_t GC_mark_lock_holder = NO_THREAD;
 #endif
 
-#ifdef IA64
+#if 0
   /* Ugly workaround for a linux threads bug in the final versions      */
   /* of glibc2.1.  Pthread_mutex_trylock sets the mutex owner           */
   /* field even when it fails to acquire the mutex.  This causes        */
@@ -1691,5 +1713,5 @@ void GC_notify_all_marker()
 
 #endif /* PARALLEL_MARK */
 
-# endif /* LINUX_THREADS */
+# endif /* GC_LINUX_THREADS and friends */
 
diff --git a/mach_dep.c b/mach_dep.c
index 776bf690..35e9264b 100644
--- a/mach_dep.c
+++ b/mach_dep.c
@@ -492,8 +492,9 @@ ptr_t cold_gc_frame;
 /* On IA64, we also need to flush register windows.  But they end	*/
 /* up on the other side of the stack segment.				*/
 /* Returns the backing store pointer for the register stack.		*/
+/* We implement this as a separate file in HP/UX.			*/
 # ifdef IA64
-#   ifdef __GNUC__
+#   ifdef LINUX
 	asm("        .text");
 	asm("        .psr abi64");
 	asm("        .psr lsb");
@@ -510,12 +511,25 @@ ptr_t cold_gc_frame;
 	asm("        mov r8=ar.bsp");
 	asm("        br.ret.sptk.few rp");
 	asm("        .endp GC_save_regs_in_stack");
-#   else
-	void GC_save_regs_in_stack() {
-	  asm("        flushrs");
-	  asm("        ;;");
-	  asm("        mov r8=ar.bsp");
-	  asm("        br.ret.sptk.few rp");
+#   endif /* LINUX */
+#   if 0 /* Other alternatives that don't work on HP/UX */
+	word GC_save_regs_in_stack() {
+#	  if USE_BUILTINS
+	    __builtin_ia64_flushrs();
+	    return __builtin_ia64_bsp();
+#	  else
+#	    ifdef HPUX
+	      _asm("        flushrs");
+	      _asm("        ;;");
+	      _asm("        mov r8=ar.bsp");
+	      _asm("        br.ret.sptk.few rp");
+#	    else
+	      asm("        flushrs");
+	      asm("        ;;");
+	      asm("        mov r8=ar.bsp");
+	      asm("        br.ret.sptk.few rp");
+#	    endif
+#	  endif
 	}
 #   endif
 # endif
diff --git a/malloc.c b/malloc.c
index 0bbb96ab..943f27d3 100644
--- a/malloc.c
+++ b/malloc.c
@@ -315,7 +315,7 @@ DCL_LOCK_STATE;
     /* It might help to manually inline the GC_malloc call here.	*/
     /* But any decent compiler should reduce the extra procedure call	*/
     /* to at most a jump instruction in this case.			*/
-#   if defined(I386) && defined(SOLARIS_THREADS)
+#   if defined(I386) && defined(GC_SOLARIS_THREADS)
       /*
        * Thread initialisation can call malloc before
        * we're ready for it.
@@ -324,7 +324,7 @@ DCL_LOCK_STATE;
        * inopportune times.
        */
       if (!GC_is_initialized) return sbrk(lb);
-#   endif /* I386 && SOLARIS_THREADS */
+#   endif /* I386 && GC_SOLARIS_THREADS */
     return((GC_PTR)REDIRECT_MALLOC(lb));
   }
 
@@ -360,7 +360,7 @@ DCL_LOCK_STATE;
     h = HBLKPTR(p);
     hhdr = HDR(h);
 #   if defined(REDIRECT_MALLOC) && \
-	(defined(SOLARIS_THREADS) || defined(LINUX_THREADS) \
+	(defined(GC_SOLARIS_THREADS) || defined(GC_LINUX_THREADS) \
 	 || defined(__MINGW32__)) /* Should this be MSWIN32 in general? */
 	/* For Solaris, we have to redirect malloc calls during		*/
 	/* initialization.  For the others, this seems to happen 	*/
diff --git a/mark_rts.c b/mark_rts.c
index 251a0d14..a082e2b2 100644
--- a/mark_rts.c
+++ b/mark_rts.c
@@ -568,11 +568,11 @@ ptr_t cold_gc_frame;
      */
 #   if !defined(USE_GENERIC_PUSH_REGS)
 	GC_push_current_stack(cold_gc_frame);
-	/* IN the threads case, this only pushes collector frames.      */
+	/* In the threads case, this only pushes collector frames.      */
 	/* In the USE_GENERIC_PUSH_REGS case, this is done inside	*/
 	/* GC_push_regs, so that we catch callee-save registers saved	*/
 	/* inside the GC_push_regs frame.				*/
-	/* In the case of linux threads on Ia64, the hot section of	*/
+	/* In the case of linux threads on IA64, the hot section of	*/
 	/* the main stack is marked here, but the register stack	*/
 	/* backing store is handled in the threads-specific code.	*/
 #   endif
diff --git a/misc.c b/misc.c
index 94ef15d3..2bb93f3d 100644
--- a/misc.c
+++ b/misc.c
@@ -22,7 +22,7 @@
 #define I_HIDE_POINTERS	/* To make GC_call_with_alloc_lock visible */
 #include "private/gc_pmark.h"
 
-#ifdef SOLARIS_THREADS
+#ifdef GC_SOLARIS_THREADS
 # include <sys/syscall.h>
 #endif
 #if defined(MSWIN32) || defined(MSWINCE)
@@ -41,29 +41,27 @@
 	/* Critical section counter is defined in the M3 runtime 	*/
 	/* That's all we use.						*/
 #     else
-#	ifdef SOLARIS_THREADS
+#	ifdef GC_SOLARIS_THREADS
 	  mutex_t GC_allocate_ml;	/* Implicitly initialized.	*/
 #	else
-#          ifdef WIN32_THREADS
+#          ifdef GC_WIN32_THREADS
 #	      if !defined(GC_NOT_DLL) && (defined(_DLL) || defined(GC_DLL))
 		 __declspec(dllexport) CRITICAL_SECTION GC_allocate_ml;
 #	      else
 		 CRITICAL_SECTION GC_allocate_ml;
 #	      endif
 #          else
-#             if defined(IRIX_THREADS) \
-		 || (defined(LINUX_THREADS) && defined(USE_SPIN_LOCK))
-	        pthread_t GC_lock_holder = NO_THREAD;
-#	      else
-#	        if defined(HPUX_THREADS) \
-		   || defined(LINUX_THREADS) && !defined(USE_SPIN_LOCK)
+#             if defined(GC_PTHREADS) && !defined(GC_SOLARIS_THREADS)
+#		if defined(USE_SPIN_LOCK)
+	          pthread_t GC_lock_holder = NO_THREAD;
+#	        else
 		  pthread_mutex_t GC_allocate_ml = PTHREAD_MUTEX_INITIALIZER;
 	          pthread_t GC_lock_holder = NO_THREAD;
 			/* Used only for assertions, and to prevent	 */
 			/* recursive reentry in the system call wrapper. */
-#		else 
+#		endif 
+#    	      else
 	          --> declare allocator lock here
-#		endif
 #	      endif
 #	   endif
 #	endif
@@ -524,20 +522,18 @@ void GC_init_inner()
 #   if defined(SEARCH_FOR_DATA_START)
 	GC_init_linux_data_start();
 #   endif
-#   if defined(NETBSD) && defined(__ELF__)
+#   if (defined(NETBSD) || defined(OPENBSD)) && defined(__ELF__)
 	GC_init_netbsd_elf();
 #   endif
-#   if defined(IRIX_THREADS) || defined(LINUX_THREADS) \
-       || defined(HPUX_THREADS) || defined(SOLARIS_THREADS)
+#   if defined(GC_PTHREADS) || defined(GC_SOLARIS_THREADS)
         GC_thr_init();
 #   endif
-#   ifdef SOLARIS_THREADS
+#   ifdef GC_SOLARIS_THREADS
 	/* We need dirty bits in order to find live stack sections.	*/
         GC_dirty_init();
 #   endif
-#   if !defined(THREADS) || defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \
-       || defined(IRIX_THREADS) || defined(LINUX_THREADS) \
-       || defined(HPUX_THREADS)
+#   if !defined(THREADS) || defined(GC_PTHREADS) || defined(GC_WIN32_THREADS) \
+	|| defined(GC_SOLARIS_THREADS)
       if (GC_stackbottom == 0) {
 	GC_stackbottom = GC_get_stack_base();
 #       if defined(LINUX) && defined(IA64)
@@ -652,7 +648,7 @@ void GC_enable_incremental GC_PROTO(())
 	if (GC_is_win32s()) goto out;
       }
 #   endif /* MSWIN32 */
-#   ifndef SOLARIS_THREADS
+#   ifndef GC_SOLARIS_THREADS
         GC_dirty_init();
 #   endif
     if (!GC_is_initialized) {
@@ -753,7 +749,7 @@ size_t len;
      register int result;
      
      while (bytes_written < len) {
-#	ifdef SOLARIS_THREADS
+#	ifdef GC_SOLARIS_THREADS
 	    result = syscall(SYS_write, fd, buf + bytes_written,
 	    			  	    len - bytes_written);
 #	else
diff --git a/new_hblk.c b/new_hblk.c
index d904aedc..1aa2c7a1 100644
--- a/new_hblk.c
+++ b/new_hblk.c
@@ -247,6 +247,7 @@ int kind;
 	    ABORT("HBLK SZ inconsistency");
         }
 #   endif
+  if (GC_debugging_started) clear = TRUE;
 
   /* Allocate a new heap block */
     h = GC_allochblk(sz, kind, 0);
diff --git a/os_dep.c b/os_dep.c
index 79bed4c7..f8fee923 100644
--- a/os_dep.c
+++ b/os_dep.c
@@ -71,10 +71,6 @@
 #   define NEED_FIND_LIMIT
 # endif
 
-# if defined(IRIX_THREADS) || defined(HPUX_THREADS)
-#   define NEED_FIND_LIMIT
-# endif
-
 # if (defined(SUNOS4) && defined(DYNAMIC_LOADING)) && !defined(PCR)
 #   define NEED_FIND_LIMIT
 # endif
@@ -219,7 +215,7 @@ static void *tiny_sbrk(ptrdiff_t increment)
 #define sbrk tiny_sbrk
 # endif /* ECOS */
 
-#if defined(NETBSD) && defined(__ELF__)
+#if (defined(NETBSD) || defined(OPENBSD)) && defined(__ELF__)
   ptr_t GC_data_start;
 
   void GC_init_netbsd_elf()
@@ -561,7 +557,7 @@ ptr_t GC_get_stack_base()
           /* signal mask.                                               */
 
 	  (void) sigemptyset(&act.sa_mask);
-#	  ifdef IRIX_THREADS
+#	  ifdef GC_IRIX_THREADS
 		/* Older versions have a bug related to retrieving and	*/
 		/* and setting a handler at the same time.		*/
 	        (void) sigaction(SIGSEGV, 0, &old_segv_act);
@@ -575,7 +571,7 @@ ptr_t GC_get_stack_base()
 		    /* don't have to worry in the threads case.		*/
 		    (void) sigaction(SIGBUS, &act, &old_bus_act);
 #		endif
-#	  endif	/* IRIX_THREADS */
+#	  endif	/* GC_IRIX_THREADS */
 #	else
     	  old_segv_handler = signal(SIGSEGV, h);
 #	  ifdef SIGBUS
@@ -670,7 +666,12 @@ ptr_t GC_get_stack_base()
 
     ptr_t GC_get_register_stack_base(void)
     {
-      if (0 != &__libc_ia64_register_backing_store_base) {
+      if (0 != &__libc_ia64_register_backing_store_base
+	  && 0 != __libc_ia64_register_backing_store_base) {
+	/* Glibc 2.2.4 has a bug such that for dynamically linked	*/
+	/* executables __libc_ia64_register_backing_store_base is 	*/
+	/* defined but ininitialized during constructor calls.  	*/
+	/* Hence we check for both nonzero address and value.		*/
 	return __libc_ia64_register_backing_store_base;
       } else {
 	word result = (word)GC_stackbottom - BACKING_STORE_DISPLACEMENT;
@@ -1079,7 +1080,7 @@ void GC_register_data_segments()
 {
 #   if !defined(PCR) && !defined(SRC_M3) && !defined(NEXT) && !defined(MACOS) \
        && !defined(MACOSX)
-#     if defined(REDIRECT_MALLOC) && defined(SOLARIS_THREADS)
+#     if defined(REDIRECT_MALLOC) && defined(GC_SOLARIS_THREADS)
 	/* As of Solaris 2.3, the Solaris threads implementation	*/
 	/* allocates the data structure for the initial thread with	*/
 	/* sbrk at process startup.  It needs to be scanned, so that	*/
@@ -1640,9 +1641,8 @@ void GC_default_push_other_roots GC_PROTO((void))
 
 # endif /* SRC_M3 */
 
-# if defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \
-     || defined(IRIX_THREADS) || defined(LINUX_THREADS) \
-     || defined(HPUX_THREADS)
+# if defined(GC_SOLARIS_THREADS) || defined(GC_PTHREADS) || \
+     defined(GC_WIN32_THREADS)
 
 extern void GC_push_all_stacks();
 
@@ -1651,11 +1651,11 @@ void GC_default_push_other_roots GC_PROTO((void))
     GC_push_all_stacks();
 }
 
-# endif /* SOLARIS_THREADS || ... */
+# endif /* GC_SOLARIS_THREADS || GC_PTHREADS */
 
 void (*GC_push_other_roots) GC_PROTO((void)) = GC_default_push_other_roots;
 
-#endif
+#endif /* THREADS */
 
 /*
  * Routines for accessing dirty  bits on virtual pages.
@@ -2399,7 +2399,7 @@ void GC_dirty_init()
 #   if defined(SUNOS5SIGS) || defined(IRIX5) || defined(LINUX) \
        || defined(OSF1) || defined(HURD)
       /* SUNOS5SIGS includes HPUX */
-#     if defined(IRIX_THREADS)
+#     if defined(GC_IRIX_THREADS)
       	sigaction(SIGSEGV, 0, &oldact);
       	sigaction(SIGSEGV, &act, 0);
 #     else
@@ -2537,7 +2537,7 @@ word len;
     	      ((ptr_t)end_block - (ptr_t)start_block) + HBLKSIZE);
 }
 
-#if !defined(MSWIN32) && !defined(MSWINCE) && !defined(LINUX_THREADS) \
+#if !defined(MSWIN32) && !defined(MSWINCE) && !defined(GC_LINUX_THREADS) \
     && !defined(GC_USE_LD_WRAP)
 /* Replacement for UNIX system call.	 */
 /* Other calls that write to the heap	 */
@@ -2561,7 +2561,7 @@ word len;
     
     GC_begin_syscall();
     GC_unprotect_range(buf, (word)nbyte);
-#   if defined(IRIX5) || defined(LINUX_THREADS)
+#   if defined(IRIX5) || defined(GC_LINUX_THREADS)
 	/* Indirect system call may not always be easily available.	*/
 	/* We could call _read, but that would interfere with the	*/
 	/* libpthread interception of read.				*/
@@ -2587,7 +2587,7 @@ word len;
     GC_end_syscall();
     return(result);
 }
-#endif /* !MSWIN32 && !MSWINCE && !LINUX_THREADS */
+#endif /* !MSWIN32 && !MSWINCE && !GC_LINUX_THREADS */
 
 #ifdef GC_USE_LD_WRAP
     /* We use the GNU ld call wrapping facility.			*/
@@ -2660,7 +2660,7 @@ word n;
 word GC_proc_buf_size = INITIAL_BUF_SZ;
 char *GC_proc_buf;
 
-#ifdef SOLARIS_THREADS
+#ifdef GC_SOLARIS_THREADS
 /* We don't have exact sp values for threads.  So we count on	*/
 /* occasionally declaring stack pages to be fresh.  Thus we 	*/
 /* need a real implementation of GC_is_fresh.  We can't clear	*/
@@ -2715,7 +2715,7 @@ void GC_dirty_init()
     	ABORT("/proc ioctl failed");
     }
     GC_proc_buf = GC_scratch_alloc(GC_proc_buf_size);
-#   ifdef SOLARIS_THREADS
+#   ifdef GC_SOLARIS_THREADS
 	GC_fresh_pages = (struct hblk **)
 	  GC_scratch_alloc(MAX_FRESH_PAGES * sizeof (struct hblk *));
 	if (GC_fresh_pages == 0) {
@@ -2733,7 +2733,7 @@ struct hblk *h;
 {
 }
 
-#ifdef SOLARIS_THREADS
+#ifdef GC_SOLARIS_THREADS
 #   define READ(fd,buf,nbytes) syscall(SYS_read, fd, buf, nbytes)
 #else
 #   define READ(fd,buf,nbytes) read(fd, buf, nbytes)
@@ -2772,7 +2772,7 @@ int dummy;
                 /* Punt:	*/
         	memset(GC_grungy_pages, 0xff, sizeof (page_hash_table));
 		memset(GC_written_pages, 0xff, sizeof(page_hash_table));
-#		ifdef SOLARIS_THREADS
+#		ifdef GC_SOLARIS_THREADS
 		    BZERO(GC_fresh_pages,
 		    	  MAX_FRESH_PAGES * sizeof (struct hblk *)); 
 #		endif
@@ -2802,7 +2802,7 @@ int dummy;
 	                register word index = PHT_HASH(h);
 	                
 	                set_pht_entry_from_index(GC_grungy_pages, index);
-#			ifdef SOLARIS_THREADS
+#			ifdef GC_SOLARIS_THREADS
 			  {
 			    register int slot = FRESH_PAGE_SLOT(h);
 			    
@@ -2820,7 +2820,7 @@ int dummy;
 	}
     /* Update GC_written_pages. */
         GC_or_pages(GC_written_pages, GC_grungy_pages);
-#   ifdef SOLARIS_THREADS
+#   ifdef GC_SOLARIS_THREADS
       /* Make sure that old stacks are considered completely clean	*/
       /* unless written again.						*/
 	GC_old_stacks_are_fresh();
@@ -2836,7 +2836,7 @@ struct hblk *h;
     register GC_bool result;
     
     result = get_pht_entry_from_index(GC_grungy_pages, index);
-#   ifdef SOLARIS_THREADS
+#   ifdef GC_SOLARIS_THREADS
 	if (result && PAGE_IS_FRESH(h)) result = FALSE;
 	/* This happens only if page was declared fresh since	*/
 	/* the read_dirty call, e.g. because it's in an unused  */
@@ -2854,7 +2854,7 @@ struct hblk *h;
     register GC_bool result;
     
     result = get_pht_entry_from_index(GC_written_pages, index);
-#   ifdef SOLARIS_THREADS
+#   ifdef GC_SOLARIS_THREADS
 	if (result && PAGE_IS_FRESH(h)) result = FALSE;
 #   endif
     return(result);
@@ -2868,7 +2868,7 @@ word n;
 
     register word index;
     
-#   ifdef SOLARIS_THREADS
+#   ifdef GC_SOLARIS_THREADS
       register word i;
       
       if (GC_fresh_pages != 0) {
diff --git a/reclaim.c b/reclaim.c
index 78995f39..48db1e29 100644
--- a/reclaim.c
+++ b/reclaim.c
@@ -702,7 +702,8 @@ COUNT_DECL
     if (report_if_found) {
 	GC_reclaim_check(hbp, hhdr, sz);
     } else {
-        *flh = GC_reclaim_generic(hbp, hhdr, sz, ok -> ok_init,
+        *flh = GC_reclaim_generic(hbp, hhdr, sz,
+				  (ok -> ok_init || GC_debugging_started),
 	 			  *flh MEM_FOUND_ADDR);
     }
 }
@@ -774,8 +775,12 @@ COUNT_DECL
 /* Routines to gather and print heap block info 	*/
 /* intended for debugging.  Otherwise should be called	*/
 /* with lock.						*/
-static size_t number_of_blocks;
-static size_t total_bytes;
+
+struct Print_stats
+{
+	size_t number_of_blocks;
+	size_t total_bytes;
+};
 
 #ifdef USE_MARK_BYTES
 
@@ -834,25 +839,30 @@ hdr * hhdr;
 {
     register hdr * hhdr = HDR(h);
     register size_t bytes = WORDS_TO_BYTES(hhdr -> hb_sz);
+    struct Print_stats *ps;
     
     GC_printf3("(%lu:%lu,%lu)", (unsigned long)(hhdr -> hb_obj_kind),
     			        (unsigned long)bytes,
     			        (unsigned long)(GC_n_set_marks(hhdr)));
     bytes += HBLKSIZE-1;
     bytes &= ~(HBLKSIZE-1);
-    total_bytes += bytes;
-    number_of_blocks++;
+
+    ps = (struct Print_stats *)dummy;
+    ps->total_bytes += bytes;
+    ps->number_of_blocks++;
 }
 
 void GC_print_block_list()
 {
+    struct Print_stats pstats;
+
     GC_printf0("(kind(0=ptrfree,1=normal,2=unc.,3=stubborn):size_in_bytes, #_marks_set)\n");
-    number_of_blocks = 0;
-    total_bytes = 0;
-    GC_apply_to_all_blocks(GC_print_block_descr, (word)0);
+    pstats.number_of_blocks = 0;
+    pstats.total_bytes = 0;
+    GC_apply_to_all_blocks(GC_print_block_descr, (word)&pstats);
     GC_printf2("\nblocks = %lu, bytes = %lu\n",
-    	       (unsigned long)number_of_blocks,
-    	       (unsigned long)total_bytes);
+    	       (unsigned long)pstats.number_of_blocks,
+    	       (unsigned long)pstats.total_bytes);
 }
 
 #endif /* NO_DEBUGGING */
diff --git a/solaris_pthreads.c b/solaris_pthreads.c
index 02c33801..e00e00b3 100644
--- a/solaris_pthreads.c
+++ b/solaris_pthreads.c
@@ -18,7 +18,7 @@
 /* Boehm, September 14, 1994 4:44 pm PDT */
 /* $Id: solaris_pthreads.c,v 1.10 1997/05/13 23:09:09 peterc Exp $ */
 
-# if defined(GC_SOLARIS_PTHREADS) || defined(_SOLARIS_PTHREADS)
+# if defined(GC_SOLARIS_PTHREADS)
 # include "private/gc_priv.h"
 # include <pthread.h>
 # include <thread.h>
@@ -176,5 +176,5 @@ GC_pthread_create(pthread_t *new_thread,
   int GC_no_sunOS_pthreads;
 #endif
 
-# endif /* SOLARIS_THREADS */
+# endif /* GC_SOLARIS_PTHREADS */
 
diff --git a/solaris_threads.c b/solaris_threads.c
index 8cc6319c..365c6b12 100644
--- a/solaris_threads.c
+++ b/solaris_threads.c
@@ -16,7 +16,7 @@
  */
 /* Boehm, September 14, 1994 4:44 pm PDT */
 
-# if defined(GC_SOLARIS_THREADS) || defined(SOLARIS_THREADS)
+# if defined(GC_SOLARIS_THREADS)
 
 # include "private/gc_priv.h"
 # include "private/solaris_threads.h"
@@ -938,7 +938,7 @@ GC_thr_create(void *stack_base, size_t stack_size,
     return(result);
 }
 
-# else /* SOLARIS_THREADS */
+# else /* !GC_SOLARIS_THREADS */
 
 #ifndef LINT
   int GC_no_sunOS_threads;
diff --git a/specific.c b/specific.c
index 5afd10b7..48b53ac9 100644
--- a/specific.c
+++ b/specific.c
@@ -11,7 +11,7 @@
  * modified is included with the above copyright notice.
  */
 
-#if defined(LINUX_THREADS) || defined(GC_LINUX_THREADS)
+#if defined(GC_LINUX_THREADS)
 
 #include "private/gc_priv.h" /* For GC_compare_and_exchange, GC_memory_barrier */
 #include "private/specific.h"
@@ -105,4 +105,4 @@ void *  PREFIXED(slow_getspecific) (tsd * key, unsigned long qtid,
     return entry -> value;
 }
 
-#endif /* LINUX_THREADS */
+#endif /* GC_LINUX_THREADS */
diff --git a/tests/test.c b/tests/test.c
index 1bd98d64..35cb1357 100644
--- a/tests/test.c
+++ b/tests/test.c
@@ -59,16 +59,16 @@
 #   define GC_printf1 printf
 # endif
 
-# ifdef SOLARIS_THREADS
+# if defined(GC_SOLARIS_THREADS) && !defined(GC_SOLARIS_PTHREADS)
 #   include <thread.h>
 #   include <synch.h>
 # endif
 
-# if defined(IRIX_THREADS) || defined(LINUX_THREADS) || defined(HPUX_THREADS)
+# if defined(GC_PTHREADS)
 #   include <pthread.h>
 # endif
 
-# ifdef WIN32_THREADS
+# ifdef GC_WIN32_THREADS
 #   ifndef MSWINCE
 #     include <process.h>
 #     define GC_CreateThread(a,b,c,d,e,f) ((HANDLE) _beginthreadex(a,b,c,d,e,f))
@@ -447,7 +447,7 @@ struct {
  */
 #ifdef THREADS
 
-# ifdef WIN32_THREADS
+# ifdef GC_WIN32_THREADS
     unsigned __stdcall tiny_reverse_test(void * arg)
 # else
     void * tiny_reverse_test(void * arg)
@@ -457,8 +457,7 @@ struct {
     return 0;
 }
 
-# if defined(IRIX_THREADS) || defined(LINUX_THREADS) \
-     || defined(SOLARIS_PTHREADS) || defined(HPUX_THREADS)
+# if defined(GC_PTHREADS)
     void fork_a_thread()
     {
       pthread_t t;
@@ -475,7 +474,7 @@ struct {
       }
     }
 
-# elif defined(WIN32_THREADS)
+# elif defined(GC_WIN32_THREADS)
     void fork_a_thread()
     {
   	unsigned thread_id;
@@ -493,7 +492,7 @@ struct {
     	}
     }
 
-/* # elif defined(SOLARIS_THREADS) */
+/* # elif defined(GC_SOLARIS_THREADS) */
 
 # else
 
@@ -649,15 +648,15 @@ VOLATILE int dropped_something = 0;
 # ifdef PCR
      PCR_ThCrSec_EnterSys();
 # endif
-# ifdef SOLARIS_THREADS
+# if defined(GC_SOLARIS_THREADS) && !defined(GC_SOLARIS_PTHREADS)
     static mutex_t incr_lock;
     mutex_lock(&incr_lock);
 # endif
-# if  defined(IRIX_THREADS) || defined(LINUX_THREADS) || defined(HPUX_THREADS)
+# if  defined(GC_PTHREADS)
     static pthread_mutex_t incr_lock = PTHREAD_MUTEX_INITIALIZER;
     pthread_mutex_lock(&incr_lock);
 # endif
-# ifdef WIN32_THREADS
+# ifdef GC_WIN32_THREADS
     EnterCriticalSection(&incr_cs);
 # endif
   if ((int)(GC_word)client_data != t -> level) {
@@ -668,13 +667,13 @@ VOLATILE int dropped_something = 0;
 # ifdef PCR
     PCR_ThCrSec_ExitSys();
 # endif
-# ifdef SOLARIS_THREADS
+# if defined(GC_SOLARIS_THREADS) && !defined(GC_SOLARIS_PTHREADS)
     mutex_unlock(&incr_lock);
 # endif
-# if defined(IRIX_THREADS) || defined(LINUX_THREADS) || defined(HPUX_THREADS)
+# if defined(GC_PTHREADS)
     pthread_mutex_unlock(&incr_lock);
 # endif
-# ifdef WIN32_THREADS
+# ifdef GC_WIN32_THREADS
     LeaveCriticalSection(&incr_cs);
 # endif
 }
@@ -740,16 +739,15 @@ int n;
 #	  ifdef PCR
  	    PCR_ThCrSec_EnterSys();
 #	  endif
-#	  ifdef SOLARIS_THREADS
+#	  if defined(GC_SOLARIS_THREADS) && !defined(GC_SOLARIS_PTHREADS)
 	    static mutex_t incr_lock;
 	    mutex_lock(&incr_lock);
 #	  endif
-#         if defined(IRIX_THREADS) || defined(LINUX_THREADS) \
-	     || defined(HPUX_THREADS)
+#         if defined(GC_PTHREADS)
             static pthread_mutex_t incr_lock = PTHREAD_MUTEX_INITIALIZER;
             pthread_mutex_lock(&incr_lock);
 #         endif
-#         ifdef WIN32_THREADS
+#         ifdef GC_WIN32_THREADS
             EnterCriticalSection(&incr_cs);
 #         endif
 		/* Losing a count here causes erroneous report of failure. */
@@ -758,14 +756,13 @@ int n;
 #	  ifdef PCR
  	    PCR_ThCrSec_ExitSys();
 #	  endif
-#	  ifdef SOLARIS_THREADS
+#	  if defined(GC_SOLARIS_THREADS) && !defined(GC_SOLARIS_PTHREADS)
 	    mutex_unlock(&incr_lock);
 #	  endif
-#	  if defined(IRIX_THREADS) || defined(LINUX_THREADS) \
-	     || defined(HPUX_THREADS)
+#	  if defined(GC_PTHREADS)
 	    pthread_mutex_unlock(&incr_lock);
 #	  endif
-#         ifdef WIN32_THREADS
+#         ifdef GC_WIN32_THREADS
             LeaveCriticalSection(&incr_cs);
 #         endif
 	}
@@ -825,7 +822,7 @@ int n;
     chktree(t -> rchild, n-1);
 }
 
-# if defined(SOLARIS_THREADS) && !defined(_SOLARIS_PTHREADS)
+# if defined(GC_SOLARIS_THREADS) && !defined(GC_SOLARIS_PTHREADS)
 thread_key_t fl_key;
 
 void * alloc8bytes()
@@ -866,9 +863,7 @@ void * alloc8bytes()
 
 #else
 
-# if defined(GC_SOLARIS_PTHREADS) || defined(GC_IRIX_THREADS) \
-     || defined(GC_LINUX_THREADS) || defined(GC_HPUX_THREADS) \
-     || defined(GC_SOLARIS_THREADS)
+# if defined(GC_PTHREADS)
 pthread_key_t fl_key;
 
 void * alloc8bytes()
@@ -1319,9 +1314,8 @@ void SetMinimumStack(long minSize)
 
 
 #if !defined(PCR) && !defined(GC_SOLARIS_THREADS) \
-    && !defined(GC_WIN32_THREADS) \
-    && !defined(GC_IRIX_THREADS) && !defined(GC_LINUX_THREADS) \
-    && !defined(GC_HPUX_THREADS) || defined(LINT)
+    && !defined(GC_WIN32_THREADS) && !defined(GC_PTHREADS) \
+    || defined(LINT)
 #if defined(MSWIN32) && !defined(__MINGW32__)
   int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prev, LPTSTR cmd, int n)
 #else
@@ -1557,8 +1551,7 @@ test()
 }
 #endif
 
-#if defined(GC_SOLARIS_THREADS) || defined(GC_IRIX_THREADS) \
- || defined(GC_HPUX_THREADS) || defined(GC_LINUX_THREADS)
+#if defined(GC_SOLARIS_THREADS) || defined(GC_PTHREADS)
 void * thr_run_one_test(void * arg)
 {
     run_one_test();
@@ -1569,7 +1562,7 @@ void * thr_run_one_test(void * arg)
 #  define GC_free GC_debug_free
 #endif
 
-#ifdef GC_SOLARIS_THREADS
+#if defined(GC_SOLARIS_THREADS) && !defined(GC_SOLARIS_PTHREADS)
 main()
 {
     thread_t th1;
@@ -1606,6 +1599,11 @@ main()
     return(0);
 }
 #else /* pthreads */
+
+#ifndef GC_PTHREADS
+  --> bad news
+#endif
+
 main()
 {
     pthread_t th1;
@@ -1618,8 +1616,15 @@ main()
 	/* Since the initial cant always grow later.	*/
 	*((volatile char *)&code - 1024*1024) = 0;      /* Require 1 Mb */
 #   endif /* GC_IRIX_THREADS */
+#   if defined(GC_HPUX_THREADS)
+	/* Default stack size is too small, especially with the 64 bit ABI */
+	/* Increase it.							   */
+	if (pthread_default_stacksize_np(1024*1024, 0) != 0) {
+          (void)GC_printf0("pthread_default_stacksize_np failed.\n");
+	}
+#   endif	/* GC_HPUX_THREADS */
     pthread_attr_init(&attr);
-#   if defined(GC_IRIX_THREADS) || defined(GC_HPUX_THREADS)
+#   if defined(GC_IRIX_THREADS)
     	pthread_attr_setstacksize(&attr, 1000000);
 #   endif
     n_tests = 0;
@@ -1656,5 +1661,5 @@ main()
     GC_printf1("Completed %d collections\n", GC_gc_no);
     return(0);
 }
-#endif /* pthreads */
-#endif /* SOLARIS_THREADS || IRIX_THREADS || LINUX_THREADS || HPUX_THREADS */
+#endif /* GC_PTHREADS */
+#endif /* GC_SOLARIS_THREADS || GC_PTHREADS */
diff --git a/threadlibs.c b/threadlibs.c
index 0ac54510..991647ee 100644
--- a/threadlibs.c
+++ b/threadlibs.c
@@ -9,20 +9,15 @@ int main()
 	       "-Wl,--wrap -Wl,pthread_detach "
 	       "-Wl,--wrap -Wl,pthread_sigmask -Wl,--wrap -Wl,sleep\n");
 #   endif
-#   if defined(LINUX_THREADS)
-      printf("-lpthread\n");
+#   if defined(GC_LINUX_THREADS) || defined(GC_IRIX_THREADS) \
+	|| defined(GC_FREEBSD_THREADS)
+        printf("-lpthread\n");
 #   endif
-#   if defined(IRIX_THREADS)
-	printf("-lpthread\n");
-#   endif
-#   if defined(HPUX_THREADS)
+#   if defined(GC_HPUX_THREADS) || defined(GC_OSF1_THREADS)
 	printf("-lpthread -lrt\n");
 #   endif
-#   ifdef SOLARIS_THREADS
+#   if defined(GC_SOLARIS_THREADS)
         printf("-lthread -ldl\n");
-#   endif
-#   ifdef GC_OSF1_THREADS
-	printf("-lpthread -lrt\n");
 #   endif
     return 0;
 }
diff --git a/version.h b/version.h
index 7efee18f..d4e69234 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define GC_VERSION_MAJOR 6
-#define GC_VERSION_MINOR 0
-#define GC_ALPHA_VERSION GC_NOT_ALPHA
+#define GC_VERSION_MINOR 1
+#define GC_ALPHA_VERSION 1
 
 #   define GC_NOT_ALPHA 0xff
 
diff --git a/win32_threads.c b/win32_threads.c
index e0d19d51..533b6a4d 100755
--- a/win32_threads.c
+++ b/win32_threads.c
@@ -1,4 +1,4 @@
-#if defined(GC_WIN32_THREADS) || defined(WIN32_THREADS)
+#if defined(GC_WIN32_THREADS)
 
 #include "private/gc_priv.h"
 
@@ -614,4 +614,4 @@ BOOL WINAPI DllMain(HINSTANCE inst, ULONG reason, LPVOID reserved)
 
 # endif /* !MSWINCE */
 
-#endif /* WIN32_THREADS */
+#endif /* GC_WIN32_THREADS */
-- 
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