1 #include "pthread_impl.h"
2 
__pthread_rwlock_tryrdlock(pthread_rwlock_t * rw)3 int __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 
15 weak_alias(__pthread_rwlock_tryrdlock, pthread_rwlock_tryrdlock);
16