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

int __mtx_unlock(__mtx_t *mtx)
{
	int ret = thrd_success;
	if ((mtx->_mt_typ&3) == PTHREAD_MUTEX_RECURSIVE && mtx->_mt_cnt) {
		if ((mtx->_mt_lck&0x1fffffff) != __pthread_self()->tid)
			ret = thrd_error;
		/* _m_count is the count of additional locks, no need to real unlock */
		else --mtx->_mt_cnt;
	} else {
		if (a_swap(&mtx->_mt_lck, 0)<0 || mtx->_mt_wts)
			__syscall(SYS_futex, &mtx->_mt_lck, FUTEX_WAKE|THRD_PRIVATE, 1);
	}
	return ret;
}

int mtx_unlock(mtx_t *mut)
{
	int ret = thrd_error;
	__mtx_t * m = __mtx_getref(mut);
	if (m) {
		ret = __mtx_unlock(m);
		__mtx_unref(m);
	}
	return ret;
}