[wasi-libc.git] / libc-top-half / musl / src / thread / pthread_rwlock_timedwrlock.c

#include "pthread_impl.h"

int __pthread_rwlock_timedwrlock(pthread_rwlock_t *restrict rw, const struct timespec *restrict at)
{
	int r, t;
	
	r = pthread_rwlock_trywrlock(rw);
	if (r != EBUSY) return r;
	
	int spins = 100;
	while (spins-- && rw->_rw_lock && !rw->_rw_waiters) a_spin();

	while ((r=__pthread_rwlock_trywrlock(rw))==EBUSY) {
		if (!(r=rw->_rw_lock)) continue;
		t = r | 0x80000000;
		a_inc(&rw->_rw_waiters);
		a_cas(&rw->_rw_lock, r, t);
		r = __timedwait(&rw->_rw_lock, t, CLOCK_REALTIME, at, rw->_rw_shared^128);
		a_dec(&rw->_rw_waiters);
		if (r && r != EINTR) return r;
	}
	return r;
}

weak_alias(__pthread_rwlock_timedwrlock, pthread_rwlock_timedwrlock);
Commit	Line	Data
320054e8 DG	1	#include "pthread_impl.h"
320054e8 DG	2
f41256b6	3	int __pthread_rwlock_timedwrlock(pthread_rwlock_t restrict rw, const struct timespec restrict at)
320054e8 DG	4	{
	5	int r, t;
	6
	7	r = pthread_rwlock_trywrlock(rw);
	8	if (r != EBUSY) return r;
	9
	10	int spins = 100;
	11	while (spins-- && rw->_rw_lock && !rw->_rw_waiters) a_spin();
	12
f41256b6	13	while ((r=__pthread_rwlock_trywrlock(rw))==EBUSY) {
320054e8 DG	14	if (!(r=rw->_rw_lock)) continue;
	15	t = r \| 0x80000000;
	16	a_inc(&rw->_rw_waiters);
	17	a_cas(&rw->_rw_lock, r, t);
	18	r = __timedwait(&rw->_rw_lock, t, CLOCK_REALTIME, at, rw->_rw_shared^128);
	19	a_dec(&rw->_rw_waiters);
	20	if (r && r != EINTR) return r;
	21	}
	22	return r;
	23	}
f41256b6 DG	24
f41256b6 DG	25	weak_alias(__pthread_rwlock_timedwrlock, pthread_rwlock_timedwrlock);