Replaces TAS with TTAS lock

kernel/src/smp/taslock.c

@@ -11,15 +11,19 @@ void taslock_init(taslock_t *l)
 
 bool taslock_acquire(taslock_t *l)
 {
-	while (!taslock_try_acquire(l))
-		if (kernel_preempt())
-			return false;
-	return true;
+	while (true) {
+		while (__atomic_load_n(&l->lock, __ATOMIC_ACQUIRE)) {
+			if (kernel_preempt())
+				return false;
+		}
+		if (taslock_try_acquire(l))
+			return true;
+	}
 }
 
 bool taslock_try_acquire(taslock_t *l)
 {
-	return __atomic_fetch_or(&l->lock, 1, __ATOMIC_ACQUIRE);
+	return !__atomic_fetch_or(&l->lock, 1, __ATOMIC_ACQUIRE);
 }
 
 void taslock_release(taslock_t *l)

kernel/src/syscall.c

@@ -230,6 +230,7 @@ proc_t *handle_sync(proc_t *const p, const sys_args_t *args)
 	// Full sync invokes scheduler,
 	// otherwise only update memory.
 	if (args->sync.full) {
+		p->timeout = 0;
 		proc_release(p);
 		return NULL;
 	}