+void __lock_2(volatile int *l)
+{
+ if (!__syscall(SYS_futex, l, FUTEX_LOCK_PI, 0, 0))
+ return;
+ int old, tid = __pthread_self()->tid|INT_MIN;
+ while ((old = a_cas(l, 0, tid))) {
+ a_cas(l, old, old|INT_MIN);
+ __syscall(SYS_futex, l, FUTEX_WAIT, old|INT_MIN, 0);
+ }
+}
+