mailing list of musl libc

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 #include <threads.h>
#include <pthread.h>
#include <errno.h>

int mtx_timedlock_base(mtx_t *restrict m, int time_base, const struct timespec *restrict ts)
{
	clockid_t clock = CLOCK_REALTIME;
	switch (time_base)
	{
	case TIME_UTC:
		clock = CLOCK_REALTIME;
		break;
	case TIME_MONOTONIC:
		clock = CLOCK_MONOTONIC;
		break;
	default:
		return thrd_error;
	}
	int ret = pthread_mutex_clocklock((pthread_mutex_t *)m, clock, ts);
	switch (ret) {
	default:        return thrd_error;
	case 0:         return thrd_success;
	case ETIMEDOUT: return thrd_timedout;
	}
}