* elf/dl-load.c (open_verify): Find .note.ABI-tag notes even
[glibc.git] / nptl / pthread_rwlock_unlock.c
blob87a77a94abb30d2e503c64bf6f241636c9a36b19
1 /* Copyright (C) 2003, 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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <errno.h>
21 #include <sysdep.h>
22 #include <lowlevellock.h>
23 #include <pthread.h>
24 #include <pthreadP.h>
26 /* Unlock RWLOCK. */
27 int
28 __pthread_rwlock_unlock (pthread_rwlock_t *rwlock)
30 lll_mutex_lock (rwlock->__data.__lock);
31 if (rwlock->__data.__writer)
32 rwlock->__data.__writer = 0;
33 else
34 --rwlock->__data.__nr_readers;
35 if (rwlock->__data.__nr_readers == 0)
37 if (rwlock->__data.__nr_writers_queued)
39 ++rwlock->__data.__writer_wakeup;
40 lll_mutex_unlock (rwlock->__data.__lock);
41 lll_futex_wake (&rwlock->__data.__writer_wakeup, 1,
42 // XYZ check mutex flag
43 LLL_SHARED);
44 return 0;
46 else if (rwlock->__data.__nr_readers_queued)
48 ++rwlock->__data.__readers_wakeup;
49 lll_mutex_unlock (rwlock->__data.__lock);
50 lll_futex_wake (&rwlock->__data.__readers_wakeup, INT_MAX,
51 // XYZ check mutex flag
52 LLL_SHARED);
53 return 0;
56 lll_mutex_unlock (rwlock->__data.__lock);
57 return 0;
60 weak_alias (__pthread_rwlock_unlock, pthread_rwlock_unlock)
61 strong_alias (__pthread_rwlock_unlock, __pthread_rwlock_unlock_internal)