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Code Editor : tg-thread-cancel.diff
From: Samuel Thibault <samuel.thibault@ens-lyon.org> Subject: [PATCH] The critical section lock _can_ be held in these place. At least since hurd_thread_cancel can be called by another thread and lock our critical lock. http://bugs.debian.org/46859 “ Thomas suggested that there is no need to take the critical section lock. I believe that taking the critical section lock is necessary to prevent the target thread from entering a signal handler. Roland will look into the problem. ” Taking the critical section lock makes these assertions bogus. It happens that hurd_thread_cancel is only called from libports and inside /hurd/term so this is rare in practice. A reproducer can be found here: http://lists.gnu.org/archive/html/bug-hurd/2014-05/msg00025.html 2006-08-05 Samuel Thibault <samuel.thibault@ens-lyon.org> * hurd/thread-cancel.c (hurd_thread_cancel): Do not assert that `&ss->critical_section_lock' is unlocked. * sysdeps/mach/hurd/jmp-unwind.c (_longjmp_unwind): Likewise, and take critical section lock before taking the sigstate lock. * sysdeps/mach/hurd/spawni.c (__spawni): Likewise. --- hurd/hurdexec.c | 1 - hurd/thread-cancel.c | 2 -- sysdeps/mach/hurd/jmp-unwind.c | 3 +-- sysdeps/mach/hurd/spawni.c | 1 - 4 files changed, 1 insertion(+), 6 deletions(-) --- a/hurd/hurdexec.c +++ b/hurd/hurdexec.c @@ -123,7 +123,6 @@ ss = _hurd_self_sigstate (); - assert (! __spin_lock_locked (&ss->critical_section_lock)); __spin_lock (&ss->critical_section_lock); _hurd_sigstate_lock (ss); --- a/hurd/thread-cancel.c +++ b/hurd/thread-cancel.c @@ -51,7 +51,6 @@ return 0; } - assert (! __spin_lock_locked (&ss->critical_section_lock)); __spin_lock (&ss->critical_section_lock); __spin_lock (&ss->lock); err = __thread_suspend (thread); @@ -91,7 +90,6 @@ int cancel; __spin_lock (&ss->lock); - assert (! __spin_lock_locked (&ss->critical_section_lock)); cancel = ss->cancel; ss->cancel = 0; __spin_unlock (&ss->lock); --- a/sysdeps/mach/hurd/jmp-unwind.c +++ b/sysdeps/mach/hurd/jmp-unwind.c @@ -49,9 +49,8 @@ /* All access to SS->active_resources must take place inside a critical section where signal handlers cannot run. */ - __spin_lock (&ss->lock); - assert (! __spin_lock_locked (&ss->critical_section_lock)); __spin_lock (&ss->critical_section_lock); + __spin_lock (&ss->lock); /* Remove local signal preemptors being unwound past. */ while (ss->preemptors --- a/sysdeps/mach/hurd/spawni.c +++ b/sysdeps/mach/hurd/spawni.c @@ -333,7 +333,6 @@ ss = _hurd_self_sigstate (); - assert (! __spin_lock_locked (&ss->critical_section_lock)); __spin_lock (&ss->critical_section_lock); _hurd_sigstate_lock (ss); --- tg: (9a079e2..) t/thread-cancel (depends on: baseline)
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