musl/src/thread/pthread_mutex_consistent.c

#include "pthread_impl.h"

int pthread_mutex_consistent(pthread_mutex_t *m)
{
	if (!(m->_m_type & 8)) return EINVAL;
	if ((m->_m_lock & 0x7fffffff) != __pthread_self()->tid)
		return EPERM;
	m->_m_type &= ~8U;
	return 0;
}