46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2013.
|
|
|
|
This file is part of the Sortix C Library.
|
|
|
|
The Sortix C Library is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The Sortix C Library is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
pthread/pthread_rwlock_unlock.c
|
|
Releases hold of a read-write lock.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <pthread.h>
|
|
|
|
int pthread_rwlock_unlock(pthread_rwlock_t* rwlock)
|
|
{
|
|
pthread_mutex_lock(&rwlock->request_mutex);
|
|
if ( rwlock->num_writers )
|
|
{
|
|
rwlock->num_writers = 0;
|
|
if ( rwlock->pending_writers )
|
|
pthread_cond_signal(&rwlock->writer_condition);
|
|
else
|
|
pthread_cond_broadcast(&rwlock->reader_condition);
|
|
}
|
|
else
|
|
{
|
|
if ( --rwlock->num_readers == 0 && rwlock->pending_writers )
|
|
pthread_cond_signal(&rwlock->writer_condition);
|
|
}
|
|
pthread_mutex_unlock(&rwlock->request_mutex);
|
|
return 0;
|
|
}
|