mailing list of musl libc

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 #include "pthread_impl.h"
#include <threads.h>

int mtx_lock(mtx_t *m)
{
	__THRD_ABI_MARK;
	if (m->_m_type == PTHREAD_MUTEX_NORMAL && !a_cas(&m->_m_lock, 0, EBUSY))
		return thrd_success;
	/* Calling mtx_timedlock with a null pointer is an
	   extension. Such a call is convenient, here, since it avoids
	   to repeat the case analysis that is already done for
	   mtx_timedlock. */
	return mtx_timedlock(m, 0);
}