[SCM] Debian GNU Hurd packaging branch, libpthread, updated. upstream/libpthread/20111106-2-gdb7bf95

[Samuel Thibault]

The following commit has been merged in the libpthread branch:
commit db7bf9590dc08a72de9a9c46db7937188156fa2e
Author: Samuel Thibault <address@hidden>
Date:   Sun Nov 27 18:39:25 2011 +0100

    Fix __mutex_unlock_solid safety
    
    libc releases the spinlock before calling __mutex_unlock_solid, so we have 
to
    try to reacquire it before possibly giving it to some blocked thread.
    
    * pthread/cthreads-compat.c (__mutex_unlock_solid): Call
    __pthread_spin_trylock before calling __pthread_mutex_unlock.

diff --git a/pthread/cthreads-compat.c b/pthread/cthreads-compat.c
index e0536ef..cbe8170 100644
--- a/pthread/cthreads-compat.c
+++ b/pthread/cthreads-compat.c
@@ -100,5 +100,8 @@ __mutex_lock_solid (void *lock)
 void
 __mutex_unlock_solid (void *lock)
 {
+  if (__pthread_spin_trylock (lock) != 0)
+    /* Somebody already got the lock, that one will manage waking up others */
+    return;
   __pthread_mutex_unlock (lock);
 }

-- 
Debian GNU Hurd packaging