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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
Brian Carlstromfc0e3212013-07-17 14:40:12 -070017#ifndef ART_RUNTIME_BARRIER_H_
18#define ART_RUNTIME_BARRIER_H_
Mathieu Chartier858f1c52012-10-17 17:45:55 -070019
Elliott Hughes76b61672012-12-12 17:47:30 -080020#include "base/mutex.h"
Mathieu Chartier858f1c52012-10-17 17:45:55 -070021#include "UniquePtr.h"
22
23namespace art {
24
25class Barrier {
26 public:
Brian Carlstrom93ba8932013-07-17 21:31:49 -070027 explicit Barrier(int count);
Mathieu Chartier858f1c52012-10-17 17:45:55 -070028 virtual ~Barrier();
29
30 // Pass through the barrier, decrements the count but does not block.
31 void Pass(Thread* self);
32
33 // Wait on the barrier, decrement the count.
34 void Wait(Thread* self);
35
36 // Set the count to a new value, if the value is 0 then everyone waiting on the condition
37 // variable is resumed.
38 void Init(Thread* self, int count);
39
40 // Increment the count by delta, wait on condition if count is non zero.
41 void Increment(Thread* self, int delta);
42
Dave Allison0aded082013-11-07 13:15:11 -080043 // Increment the count by delta, wait on condition if count is non zero, with a timeout
44 void Increment(Thread* self, int delta, uint32_t timeout_ms) LOCKS_EXCLUDED(lock_);
45
Mathieu Chartier858f1c52012-10-17 17:45:55 -070046 private:
47 void SetCountLocked(Thread* self, int count) EXCLUSIVE_LOCKS_REQUIRED(lock_);
48
49 // Counter, when this reaches 0 all people blocked on the barrier are signalled.
50 int count_ GUARDED_BY(lock_);
51
52 Mutex lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
53 ConditionVariable condition_ GUARDED_BY(lock_);
54};
55
56} // namespace art
Brian Carlstromfc0e3212013-07-17 14:40:12 -070057#endif // ART_RUNTIME_BARRIER_H_