1#include "pthread_impl.h"
 2
 3int __pthread_rwlock_tryrdlock(pthread_rwlock_t *rw)
 4{
 5	int val, cnt;
 6	do {
 7		val = rw->_rw_lock;
 8		cnt = val & 0x7fffffff;
 9		if (cnt == 0x7fffffff) return EBUSY;
10		if (cnt == 0x7ffffffe) return EAGAIN;
11	} while (a_cas(&rw->_rw_lock, val, val+1) != val);
12	return 0;
13}
14
15weak_alias(__pthread_rwlock_tryrdlock, pthread_rwlock_tryrdlock);