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

#include "pthread_impl.h"

int __pthread_rwlock_unlock(pthread_rwlock_t *rw)
{
	int val, cnt, waiters, new, priv = rw->_rw_shared^128;

	do {
		val = rw->_rw_lock;
		cnt = val & 0x7fffffff;
		waiters = rw->_rw_waiters;
		new = (cnt == 0x7fffffff || cnt == 1) ? 0 : val-1;
	} while (a_cas(&rw->_rw_lock, val, new) != val);

	if (!new && (waiters || val<0))
		__wake(&rw->_rw_lock, cnt, priv);

	return 0;
}

weak_alias(__pthread_rwlock_unlock, pthread_rwlock_unlock);
Commit	Line	Data
320054e8 DG	1	#include "pthread_impl.h"
320054e8 DG	2
f41256b6	3	int __pthread_rwlock_unlock(pthread_rwlock_t *rw)
320054e8 DG	4	{
	5	int val, cnt, waiters, new, priv = rw->_rw_shared^128;
	6
	7	do {
	8	val = rw->_rw_lock;
	9	cnt = val & 0x7fffffff;
	10	waiters = rw->_rw_waiters;
	11	new = (cnt == 0x7fffffff \|\| cnt == 1) ? 0 : val-1;
	12	} while (a_cas(&rw->_rw_lock, val, new) != val);
	13
	14	if (!new && (waiters \|\| val<0))
	15	__wake(&rw->_rw_lock, cnt, priv);
	16
	17	return 0;
	18	}
f41256b6 DG	19
f41256b6 DG	20	weak_alias(__pthread_rwlock_unlock, pthread_rwlock_unlock);