1 #include "pthread_impl.h"
3 void __lock_2(volatile int *l)
5 if (!__syscall(SYS_futex, l, FUTEX_LOCK_PI, 0, 0))
7 int old, tid = __pthread_self()->tid|INT_MIN;
8 while ((old = a_cas(l, 0, tid))) {
9 a_cas(l, old, old|INT_MIN);
10 __syscall(SYS_futex, l, FUTEX_WAIT, old|INT_MIN, 0);
14 void __lock(volatile int *l)
16 if (a_cas(l, 0, __pthread_self()->tid)) __lock_2(l);
19 void __unlock_2(volatile int *l)
21 if (__syscall(SYS_futex, l, FUTEX_UNLOCK_PI)) {
23 __syscall(SYS_futex, l, FUTEX_WAKE, 1);
27 void __unlock(volatile int *l)
30 if (!(old & INT_MIN) && a_cas(l, old, 0)==old) return;