about summary refs log tree commit diff
path: root/src/thread/pthread_rwlock_timedwrlock.c
blob: 9f7496485fa939f788b0b212e13224af6ad63762 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
#include "pthread_impl.h"

int pthread_rwlock_timedwrlock(pthread_rwlock_t *rw, const struct timespec *at)
{
	int nr, *p, w=0;
	while (pthread_rwlock_trywrlock(rw)==EAGAIN) {
		if (!w) a_inc(&rw->__waiters), w++;
		if ((nr=rw->__readers)) p = &rw->__readers;
		else nr=1, p = &rw->__wrlock;
		if (__timedwait(p, nr, CLOCK_REALTIME, at, 0)==ETIMEDOUT) {
			if (w) a_dec(&rw->__waiters);
			return ETIMEDOUT;
		}
	}
	if (w) a_dec(&rw->__waiters);
	return 0;
}