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} 18