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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_RUNTIME_BARRIER_H_
#define ART_RUNTIME_BARRIER_H_
#include "base/mutex.h"
#include "UniquePtr.h"
namespace art {
class Barrier {
public:
explicit Barrier(int count);
virtual ~Barrier();
// Pass through the barrier, decrements the count but does not block.
void Pass(Thread* self);
// Wait on the barrier, decrement the count.
void Wait(Thread* self);
// Set the count to a new value, if the value is 0 then everyone waiting on the condition
// variable is resumed.
void Init(Thread* self, int count);
// Increment the count by delta, wait on condition if count is non zero.
void Increment(Thread* self, int delta);
// Increment the count by delta, wait on condition if count is non zero, with a timeout
void Increment(Thread* self, int delta, uint32_t timeout_ms) LOCKS_EXCLUDED(lock_);
private:
void SetCountLocked(Thread* self, int count) EXCLUSIVE_LOCKS_REQUIRED(lock_);
// Counter, when this reaches 0 all people blocked on the barrier are signalled.
int count_ GUARDED_BY(lock_);
Mutex lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
ConditionVariable condition_ GUARDED_BY(lock_);
};
} // namespace art
#endif // ART_RUNTIME_BARRIER_H_
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