diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/pthread/pthread_cond_signal.c')
| -rw-r--r-- | libpthread/nptl/sysdeps/pthread/pthread_cond_signal.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/libpthread/nptl/sysdeps/pthread/pthread_cond_signal.c b/libpthread/nptl/sysdeps/pthread/pthread_cond_signal.c index 5091bea87..d66f3edbb 100644 --- a/libpthread/nptl/sysdeps/pthread/pthread_cond_signal.c +++ b/libpthread/nptl/sysdeps/pthread/pthread_cond_signal.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2003, 2004 Free Software Foundation, Inc. +/* Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003. @@ -23,14 +23,19 @@ #include <lowlevellock.h> #include <pthread.h> #include <pthreadP.h> + #include <bits/kernel-features.h> int -__pthread_cond_signal (pthread_cond_t *cond) +__pthread_cond_signal ( + pthread_cond_t *cond) { + int pshared = (cond->__data.__mutex == (void *) ~0l) + ? LLL_SHARED : LLL_PRIVATE; + /* Make sure we are alone. */ - lll_mutex_lock (cond->__data.__lock); + lll_lock (cond->__data.__lock, pshared); /* Are there any waiters to be woken? */ if (cond->__data.__total_seq > cond->__data.__wakeup_seq) @@ -40,12 +45,18 @@ __pthread_cond_signal (pthread_cond_t *cond) ++cond->__data.__futex; /* Wake one. */ - lll_futex_wake (&cond->__data.__futex, 1); + if (! __builtin_expect (lll_futex_wake_unlock (&cond->__data.__futex, 1, + 1, &cond->__data.__lock, + pshared), 0)) + return 0; + + lll_futex_wake (&cond->__data.__futex, 1, pshared); } /* We are done. */ - lll_mutex_unlock (cond->__data.__lock); + lll_unlock (cond->__data.__lock, pshared); return 0; } + weak_alias(__pthread_cond_signal, pthread_cond_signal) |