From 9cbf10a06e6c3c1dffe43ca6c642bb5f7c5e8224 Mon Sep 17 00:00:00 2001
From: Corinna Vinschen <corinna@vinschen.de>
Date: Wed, 23 May 2012 19:49:39 +0000
Subject: 	* thread.cc (__cygwin_lock_lock): Take null thread at process
 startup 	into account. 	(__cygwin_lock_trylock): Ditto. 
 (__cygwin_lock_unlock): Ditto.

---
 winsup/cygwin/thread.cc | 32 +++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)

(limited to 'winsup/cygwin/thread.cc')

diff --git a/winsup/cygwin/thread.cc b/winsup/cygwin/thread.cc
index 72806b8de..d52a85121 100644
--- a/winsup/cygwin/thread.cc
+++ b/winsup/cygwin/thread.cc
@@ -144,9 +144,12 @@ __cygwin_lock_lock (_LOCK_T *lock)
 {
   paranoid_printf ("threadcount %d.  locking", MT_INTERFACE->threadcount);
 #ifdef WORKAROUND_NEWLIB
-  __cygwin_lock_handler *cleanup
-    = new __cygwin_lock_handler (__cygwin_lock_cleanup, lock);
-  pthread::self ()->push_cleanup_handler (cleanup);
+  if (pthread::self () != pthread_null::get_null_pthread ())
+    {
+      __cygwin_lock_handler *cleanup
+	= new __cygwin_lock_handler (__cygwin_lock_cleanup, lock);
+      pthread::self ()->push_cleanup_handler (cleanup);
+    }
 #endif /* WORKAROUND_NEWLIB */
   pthread_mutex_lock ((pthread_mutex_t*) lock);
 }
@@ -155,12 +158,18 @@ extern "C" int
 __cygwin_lock_trylock (_LOCK_T *lock)
 {
 #ifdef WORKAROUND_NEWLIB
-  __cygwin_lock_handler *cleanup
-    = new __cygwin_lock_handler (__cygwin_lock_cleanup, lock);
-  pthread::self ()->push_cleanup_handler (cleanup);
+  __cygwin_lock_handler *cleanup = NULL;
+  if (pthread::self () != pthread_null::get_null_pthread ())
+    {
+      cleanup = new __cygwin_lock_handler (__cygwin_lock_cleanup, lock);
+      pthread::self ()->push_cleanup_handler (cleanup);
+    }
   int ret = pthread_mutex_trylock ((pthread_mutex_t*) lock);
-  if (ret)
-    pthread::self ()->pop_cleanup_handler (0);
+  if (ret && pthread::self () != pthread_null::get_null_pthread ())
+    {
+      pthread::self ()->pop_cleanup_handler (0);
+      delete cleanup;
+    }
   return ret;
 #else
   return pthread_mutex_trylock ((pthread_mutex_t*) lock);
@@ -171,10 +180,11 @@ extern "C" void
 __cygwin_lock_unlock (_LOCK_T *lock)
 {
 #ifdef WORKAROUND_NEWLIB
-  pthread::self ()->pop_cleanup_handler (1);
-#else
-  pthread_mutex_unlock ((pthread_mutex_t*) lock);
+  if (pthread::self () != pthread_null::get_null_pthread ())
+    pthread::self ()->pop_cleanup_handler (1);
+  else
 #endif /* WORKAROUND_NEWLIB */
+  pthread_mutex_unlock ((pthread_mutex_t*) lock);
   paranoid_printf ("threadcount %d.  unlocked", MT_INTERFACE->threadcount);
 }
 
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