musl/src/thread/pthread_mutex_consistent.c

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#include "pthread_impl.h"
int pthread_mutex_consistent(pthread_mutex_t *m)
{
if (m->_m_type < 8) return EINVAL;
if ((m->_m_lock & 0x3fffffff) != pthread_self()->tid)
return EPERM;
m->_m_type -= 8;
return 0;
}