1 /* Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
22 #include <lowlevellock.h>
26 #include <bits/kernel-features.h>
31 __pthread_cond_signal (
34 int pshared = (cond->__data.__mutex == (void *) ~0l)
35 ? LLL_SHARED : LLL_PRIVATE;
37 /* Make sure we are alone. */
38 lll_lock (cond->__data.__lock, pshared);
40 /* Are there any waiters to be woken? */
41 if (cond->__data.__total_seq > cond->__data.__wakeup_seq)
43 /* Yes. Mark one of them as woken. */
44 ++cond->__data.__wakeup_seq;
45 ++cond->__data.__futex;
48 if (! __builtin_expect (lll_futex_wake_unlock (&cond->__data.__futex, 1,
49 1, &cond->__data.__lock,
53 lll_futex_wake (&cond->__data.__futex, 1, pshared);
57 lll_unlock (cond->__data.__lock, pshared);
62 weak_alias(__pthread_cond_signal, pthread_cond_signal)