mailing list of musl libc

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 #include "pthread_impl.h"
#include <threads.h>

int __clock_gettime(clockid_t clk, struct timespec *ts);

int __thrd_wait(volatile int *addr, int val, const struct timespec *at)
{
	int r;
	struct timespec to, *top=0;

	if (at) {
		if (at->tv_nsec >= 1000000000UL) return EINVAL;
		if (__clock_gettime(CLOCK_REALTIME, &to)) return EINVAL;
		to.tv_sec = at->tv_sec - to.tv_sec;
		if ((to.tv_nsec = at->tv_nsec - to.tv_nsec) < 0) {
			to.tv_sec--;
			to.tv_nsec += 1000000000;
		}
		if (to.tv_sec < 0) return ETIMEDOUT;
		top = &to;
	}

	r = -__syscall_cp(SYS_futex, addr, FUTEX_WAIT|THRD_PRIVATE, val, top);
	if (r == EINTR || r == EINVAL || r == ETIMEDOUT || r == EWOULDBLOCK) return r;
	return 0;
}