This commit was manufactured by cvs2svn to create tag 'cygwin-cygwin-1_7_19-release

1_7_19-release'.

Sprout from cygwin-64bit-premerge-branch 2013-04-22 17:11:23 UTC cvs2svn 'This commit was manufactured by cvs2svn to create branch 'cygwin-64bit-'
Cherrypick from master 2013-06-05 07:57:39 UTC Corinna Vinschen <corinna@vinschen.de> '	* faq-programming.xml: Convert url to refer to new flat faq.html file.':
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    winsup/utils/utils.sgml

1 files changed, 43 insertions, 55 deletions

diff --git a/winsup/cygwin/sigproc.cc b/winsup/cygwin/sigproc.cc
index e585877b9..55c5bbac9 100644
--- a/winsup/cygwin/sigproc.cc
+++ b/winsup/cygwin/sigproc.cc
@@ -44,8 +44,6 @@ char NO_COPY myself_nowait_dummy[1] = {'0'};// Flag to sig_send that signal goes
 
 #define Static static NO_COPY
 
-Static HANDLE sig_hold;			// Used to stop signal processing
-Static bool sigheld;			// True if holding signals
 
 Static int nprocs;			// Number of deceased children
 Static char cprocs[(NPROCS + 1) * sizeof (pinfo)];// All my children info
@@ -171,7 +169,7 @@ mychild (int pid)
 /* Handle all subprocess requests
  */
 int __reg2
-proc_subproc (DWORD what, DWORD val)
+proc_subproc (DWORD what, uintptr_t val)
 {
   int rc = 1;
   int potential_match;
@@ -449,7 +447,16 @@ exit_thread (DWORD res)
 # undef ExitThread
   sigfillset (&_my_tls.sigmask);	/* No signals wanted */
   lock_process for_now;			/* May block indefinitely when exiting. */
-  if (exit_state)
+  /* ES_EXIT_STARTING indicates that exit is in progress.  After setting
+     exit_state to ES_EXIT_STARTING, the global dtors are running first,
+     then the exit state is set to the next level in do_exit.  We must not
+     block the thread exit while the global dtors are running, because
+     one of them might have called pthread_join, which is perfectly valid
+     for a global C++ destructor.
+     FIXME: Do we need another state between ES_EXIT_STARTING and
+            ES_SIGNAL_EXIT to narrow the gap in which the thread exit
+	    is still valid? */
+  if (exit_state > ES_EXIT_STARTING)
     {
       for_now.release ();
       Sleep (INFINITE);
@@ -478,24 +485,6 @@ exit_thread (DWORD res)
 int __reg3
 sig_send (_pinfo *p, int sig, _cygtls *tid)
 {
-  if (sig == __SIGHOLD)
-    sigheld = true;
-  else if (!sigheld)
-    /* nothing */;
-  else if (sig == __SIGFLUSH || sig == __SIGFLUSHFAST)
-    return 0;
-  else if (sig == __SIGNOHOLD)
-    {
-      SetEvent (sig_hold);
-      sigheld = false;
-    }
-  else if (&_my_tls == _main_tls)
-    {
-#ifdef DEBUGGING
-      system_printf ("signal %d sent to %p while signals are on hold", sig, p);
-#endif
-      return -1;
-    }
   siginfo_t si = {};
   si.si_signo = sig;
   si.si_code = SI_KERNEL;
@@ -991,7 +980,7 @@ child_info::sync (pid_t pid, HANDLE& hProcess, DWORD howlong)
 	      hProcess = NULL;
 	    }
 	}
-      sigproc_printf ("pid %u, WFMO returned %d, exit_code %p, res %d", pid, x,
+      sigproc_printf ("pid %u, WFMO returned %d, exit_code %y, res %d", pid, x,
 		      exit_code, res);
     }
   return res;
@@ -1002,7 +991,7 @@ child_info::proc_retry (HANDLE h)
 {
   if (!exit_code)
     return EXITCODE_OK;
-  sigproc_printf ("exit_code %p", exit_code);
+  sigproc_printf ("exit_code %y", exit_code);
   switch (exit_code)
     {
     case STILL_ACTIVE:	/* shouldn't happen */
@@ -1226,7 +1215,7 @@ static void WINAPI
 wait_sig (VOID *)
 {
   _sig_tls = &_my_tls;
-  sig_hold = CreateEvent (&sec_none_nih, FALSE, FALSE, NULL);
+  bool sig_held = false;
 
   sigproc_printf ("entering ReadFile loop, my_readsig %p, my_sendsig %p",
 		  my_readsig, my_sendsig);
@@ -1275,33 +1264,7 @@ wait_sig (VOID *)
 	      *pack.mask |= bit;
 	  break;
 	case __SIGHOLD:
-	  goto loop;
-	  break;
-	default:
-	  if (pack.si.si_signo < 0)
-	    sig_clear (-pack.si.si_signo);
-	  else
-	    sigq.add (pack);
-	case __SIGNOHOLD:
-	case __SIGFLUSH:
-	case __SIGFLUSHFAST:
-	  {
-	    sigpacket *qnext;
-	    /* Check the queue for signals.  There will always be at least one
-	       thing on the queue if this was a valid signal.  */
-	    while ((qnext = q->next))
-	      {
-		if (qnext->si.si_signo && qnext->process () <= 0)
-		  q = q->next;
-		else
-		  {
-		    q->next = qnext->next;
-		    qnext->si.si_signo = 0;
-		  }
-	      }
-	    if (pack.si.si_signo == SIGCHLD)
-	      clearwait = true;
-	  }
+	  sig_held = true;
 	  break;
 	case __SIGSETPGRP:
 	  init_console_handler (true);
@@ -1328,16 +1291,41 @@ wait_sig (VOID *)
 	      }
 	  }
 	  break;
+	default:
+	  if (pack.si.si_signo < 0)
+	    sig_clear (-pack.si.si_signo);
+	  else
+	    sigq.add (pack);
+	case __SIGNOHOLD:
+	  sig_held = false;
+	case __SIGFLUSH:
+	case __SIGFLUSHFAST:
+	  if (!sig_held)
+	    {
+	      sigpacket *qnext;
+	      /* Check the queue for signals.  There will always be at least one
+		 thing on the queue if this was a valid signal.  */
+	      while ((qnext = q->next))
+		{
+		  if (qnext->si.si_signo && qnext->process () <= 0)
+		    q = q->next;
+		  else
+		    {
+		      q->next = qnext->next;
+		      qnext->si.si_signo = 0;
+		    }
+		}
+	      if (pack.si.si_signo == SIGCHLD)
+		clearwait = true;
+	    }
+	  break;
 	}
       if (clearwait && !have_execed)
 	proc_subproc (PROC_CLEARWAIT, 0);
-    loop:
       if (pack.wakeup)
 	{
 	  sigproc_printf ("signalling pack.wakeup %p", pack.wakeup);
 	  SetEvent (pack.wakeup);
 	}
-      if (pack.si.si_signo == __SIGHOLD)
-	WaitForSingleObject (sig_hold, INFINITE);
     }
 }