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Mathieu Chartier858f1c52012-10-17 17:45:55 -07001/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
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
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
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.
15 */
16
Mathieu Chartier0e4627e2012-10-23 16:13:36 -070017#ifndef ART_SRC_BARRIER_H_
18#define ART_SRC_BARRIER_H_
Mathieu Chartier858f1c52012-10-17 17:45:55 -070019
Mathieu Chartier0e4627e2012-10-23 16:13:36 -070020#include "../src/mutex.h"
Mathieu Chartier858f1c52012-10-17 17:45:55 -070021#include "locks.h"
22#include "UniquePtr.h"
23
24namespace art {
25
26class Barrier {
27 public:
28 Barrier();
29 virtual ~Barrier();
30
31 // Pass through the barrier, decrements the count but does not block.
32 void Pass(Thread* self);
33
34 // Wait on the barrier, decrement the count.
35 void Wait(Thread* self);
36
37 // Set the count to a new value, if the value is 0 then everyone waiting on the condition
38 // variable is resumed.
39 void Init(Thread* self, int count);
40
41 // Increment the count by delta, wait on condition if count is non zero.
42 void Increment(Thread* self, int delta);
43
44 private:
45 void SetCountLocked(Thread* self, int count) EXCLUSIVE_LOCKS_REQUIRED(lock_);
46
47 // Counter, when this reaches 0 all people blocked on the barrier are signalled.
48 int count_ GUARDED_BY(lock_);
49
50 Mutex lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
51 ConditionVariable condition_ GUARDED_BY(lock_);
52};
53
54} // namespace art
55#endif // ART_SRC_GC_BARRIER_H_
56