github.com/afumu/libc@v0.0.6/musl/src/thread/pthread_mutex_init.c

#include "pthread_impl.h"

int pthread_mutex_init(pthread_mutex_t *restrict m, const pthread_mutexattr_t *restrict a)
{
	*m = (pthread_mutex_t){0};
	if (a) m->_m_type = a->__attr;
	return 0;
}