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#include "pthread_impl.h"
int __pthread_rwlock_tryrdlock(pthread_rwlock_t *rw)
{
int val, cnt;
do {
val = rw->_rw_lock;
cnt = val & 0x7fffffff;
if (cnt == 0x7fffffff) return EBUSY;
if (cnt == 0x7ffffffe) return EAGAIN;
} while (a_cas(&rw->_rw_lock, val, val+1) != val);
return 0;
}
weak_alias(__pthread_rwlock_tryrdlock, pthread_rwlock_tryrdlock);
#ifdef TEST
int
main(void) {
return 0;
}
#endif
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