2 * Copyright (C) 2007 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef ANDROID_BARRIER_H
18 #define ANDROID_BARRIER_H
21 #include <sys/types.h>
22 #include <utils/threads.h>
29 inline Barrier() : state(CLOSED) { }
32 // Release any threads waiting at the Barrier.
33 // Provides release semantics: preceding loads and stores will be visible
34 // to other threads before they wake up.
36 Mutex::Autolock _l(lock);
41 // Reset the Barrier, so wait() will block until open() has been called.
43 Mutex::Autolock _l(lock);
47 // Wait until the Barrier is OPEN.
48 // Provides acquire semantics: no subsequent loads or stores will occur
49 // until wait() returns.
51 Mutex::Autolock _l(lock);
52 while (state == CLOSED) {
57 enum { OPENED, CLOSED };
63 }; // namespace android
65 #endif // ANDROID_BARRIER_H