Loading...
#include "pthread_impl.h" static int vmlock[2]; void __vm_lock(int inc) { for (;;) { int v = vmlock[0]; if (inc*v < 0) __wait(vmlock, vmlock+1, v, 1); else if (a_cas(vmlock, v, v+inc)==v) break; } } void __vm_unlock(void) { int inc = vmlock[0]>0 ? -1 : 1; if (a_fetch_add(vmlock, inc)==-inc && vmlock[1]) __wake(vmlock, -1, 1); } weak_alias(__vm_lock, __vm_lock_impl); weak_alias(__vm_unlock, __vm_unlock_impl); |