reorganize pthread data structures and move the definitions to alltypes.h

[musl] / src / thread / pthread_rwlock_tryrdlock.c

#include "pthread_impl.h"

int pthread_rwlock_tryrdlock(pthread_rwlock_t *rw)
{
        a_inc(&rw->_rw_readers);
        if (rw->_rw_wrlock) {
                a_dec(&rw->_rw_readers);
                if (rw->_rw_waiters && !rw->_rw_readers)
                        __wake(&rw->_rw_readers, 1, 0);
                return EAGAIN;
        }
        return 0;
}