zircon/third_party/ulib/musl/pthread/pthread_rwlock_trywrlock.c

#include "threads_impl.h"

int pthread_rwlock_trywrlock(pthread_rwlock_t* rw) {
    if (a_cas_shim(&rw->_rw_lock,
                   PTHREAD_MUTEX_RWLOCK_UNLOCKED,
                   PTHREAD_MUTEX_RWLOCK_LOCKED_FOR_WR)) {
        return EBUSY;
    }
    return 0;
}