[PATCH] Fix linuxthreads when spawned from programs using NPTL

[PATCH] Fix linuxthreads when spawned from programs using NPTL

[Jakub Jelinek]

Hi!

If a linuxthreads programs is spawned from a threaded NPTL program
(such as gnome-terminal, konsole etc.), bad things happen as
since 2003-03-25 NPTL blocks __SIGRTMIN+1, so all LT threads
but the manager (which does SIG_SETMASK at the very end) never receive
__pthread_sig_cancel.

2003-04-03  Jakub Jelinek  <jakub@redhat.com>

	* pthread.c (pthread_initialize): Unblock __pthread_sig_cancel
	in case the parent blocked it.

--- linuxthreads/pthread.c.jj	2003-04-03 07:16:43.000000000 -0500
+++ linuxthreads/pthread.c	2003-04-03 08:38:29.000000000 -0500
@@ -550,6 +550,10 @@ static void pthread_initialize(void)
   sigemptyset(&mask);
   sigaddset(&mask, __pthread_sig_restart);
   sigprocmask(SIG_BLOCK, &mask, NULL);
+  /* And unblock __pthread_sig_cancel if it has been blocked. */
+  sigdelset(&mask, __pthread_sig_restart);
+  sigaddset(&mask, __pthread_sig_cancel);
+  sigprocmask(SIG_UNBLOCK, &mask, NULL);
   /* Register an exit function to kill all other threads. */
   /* Do it early so that user-registered atexit functions are called
      before pthread_*exit_process. */

	Jakub

Re: [PATCH] Fix linuxthreads when spawned from programs using NPTL

[Ulrich Drepper]

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Jakub Jelinek wrote:

> If a linuxthreads programs is spawned from a threaded NPTL program
> (such as gnome-terminal, konsole etc.), bad things happen as
> since 2003-03-25 NPTL blocks 

This problem existed forever, why nobody noticed it is a big question.
Applied.  Thanks,

- -- 
- --------------.                        ,-.            444 Castro Street
Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
Red Hat         `--' drepper at redhat.com `---------------------------
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Re: [PATCH] Fix linuxthreads when spawned from programs using NPTL

[Roland McGrath]

It seems to me that NPTL should not leave signals blocked when it execs.