1#include "pthread_impl.h"
 2
 3void __wait(volatile int *addr, volatile int *waiters, int val, int priv)
 4{
 5	int spins=100;
 6	if (priv) priv = FUTEX_PRIVATE;
 7	while (spins-- && (!waiters || !*waiters)) {
 8		if (*addr==val) a_spin();
 9		else return;
10	}
11	if (waiters) a_inc(waiters);
12	while (*addr==val) {
13		__syscall(SYS_futex, addr, FUTEX_WAIT|priv, val, 0) != -ENOSYS
14		|| __syscall(SYS_futex, addr, FUTEX_WAIT, val, 0);
15	}
16	if (waiters) a_dec(waiters);
17}