mailing list of musl libc

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

int __pthread_cond_timedwait(cnd_t *restrict c, mtx_t *restrict m, const struct timespec *restrict ts);

int cnd_timedwait(cnd_t *restrict cond, mtx_t *restrict mutex, const struct timespec *restrict ts) {
	int ret = __pthread_cond_timedwait(cond, mutex, ts);
	switch (ret) {
	/* May also return EINVAL or EPERM. */
	default:        return thrd_error;
	case 0:         return thrd_success;
	case ETIMEDOUT: return thrd_timedout;
	}
}