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a88c9263 UD |
1 | /* Copyright (C) 2003 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003. | |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
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. */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <sysdep.h> | |
22 | #include <lowlevellock.h> | |
23 | #include <pthread.h> | |
24 | #include <pthreadP.h> | |
25 | ||
26 | /* Unlock RWLOCK. */ | |
d2637c70 UD |
27 | int |
28 | __pthread_rwlock_unlock (pthread_rwlock_t *rwlock) | |
a88c9263 | 29 | { |
d2637c70 | 30 | lll_mutex_lock (rwlock->__data.__lock); |
a88c9263 UD |
31 | if (rwlock->__data.__writer) |
32 | rwlock->__data.__writer = 0; | |
33 | else | |
d2637c70 UD |
34 | --rwlock->__data.__nr_readers; |
35 | if (rwlock->__data.__nr_readers == 0) | |
a88c9263 UD |
36 | { |
37 | if (rwlock->__data.__nr_writers_queued) | |
38 | { | |
18a53579 | 39 | ++rwlock->__data.__writer_wakeup; |
d2637c70 UD |
40 | lll_mutex_unlock (rwlock->__data.__lock); |
41 | lll_futex_wake (&rwlock->__data.__writer_wakeup, 1); | |
42 | return 0; | |
a88c9263 | 43 | } |
d2637c70 | 44 | else if (rwlock->__data.__nr_readers_queued) |
a88c9263 | 45 | { |
18a53579 | 46 | ++rwlock->__data.__readers_wakeup; |
d2637c70 UD |
47 | lll_mutex_unlock (rwlock->__data.__lock); |
48 | lll_futex_wake (&rwlock->__data.__readers_wakeup, INT_MAX); | |
49 | return 0; | |
a88c9263 UD |
50 | } |
51 | } | |
d2637c70 | 52 | lll_mutex_unlock (rwlock->__data.__lock); |
a88c9263 UD |
53 | return 0; |
54 | } | |
55 | ||
56 | weak_alias (__pthread_rwlock_unlock, pthread_rwlock_unlock) | |
57 | strong_alias (__pthread_rwlock_unlock, __pthread_rwlock_unlock_internal) |