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143 lines
4.3 KiB
143 lines
4.3 KiB
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Synchronize two or more threads using a condition variable and a mutex.
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*/
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#pragma once
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#include "CondVar.h"
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#include "Mutex.h"
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class SyncEvent {
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public:
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/*******************************************************************************
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**
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** Function: ~SyncEvent
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**
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** Description: Cleanup all resources.
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**
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** Returns: None.
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**
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*******************************************************************************/
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~SyncEvent() {}
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/*******************************************************************************
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**
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** Function: start
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**
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** Description: Start a synchronization operation.
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**
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** Returns: None.
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**
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*******************************************************************************/
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void start() { mMutex.lock(); }
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/*******************************************************************************
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**
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** Function: wait
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**
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** Description: Block the thread and wait for the event to occur.
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**
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** Returns: None.
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**
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*******************************************************************************/
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void wait() { mCondVar.wait(mMutex); }
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/*******************************************************************************
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**
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** Function: wait
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**
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** Description: Block the thread and wait for the event to occur.
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** millisec: Timeout in milliseconds.
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**
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** Returns: True if wait is successful; false if timeout occurs.
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**
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*******************************************************************************/
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bool wait(long millisec) {
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bool retVal = mCondVar.wait(mMutex, millisec);
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return retVal;
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}
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/*******************************************************************************
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**
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** Function: notifyOne
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**
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** Description: Notify a blocked thread that the event has occured.
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*Unblocks it.
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**
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** Returns: None.
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**
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*******************************************************************************/
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void notifyOne() { mCondVar.notifyOne(); }
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/*******************************************************************************
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**
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** Function: end
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**
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** Description: End a synchronization operation.
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**
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** Returns: None.
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**
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*******************************************************************************/
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void end() { mMutex.unlock(); }
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private:
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CondVar mCondVar;
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Mutex mMutex;
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};
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/*****************************************************************************/
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/*****************************************************************************/
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/*****************************************************************************
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**
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** Name: SyncEventGuard
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**
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** Description: Automatically start and end a synchronization event.
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**
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*****************************************************************************/
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class SyncEventGuard {
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public:
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/*******************************************************************************
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**
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** Function: SyncEventGuard
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**
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** Description: Start a synchronization operation.
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**
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** Returns: None.
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**
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*******************************************************************************/
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SyncEventGuard(SyncEvent& event) : mEvent(event) {
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event.start(); // automatically start operation
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};
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/*******************************************************************************
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**
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** Function: ~SyncEventGuard
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**
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** Description: End a synchronization operation.
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**
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** Returns: None.
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**
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*******************************************************************************/
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~SyncEventGuard() {
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mEvent.end(); // automatically end operation
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};
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private:
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SyncEvent& mEvent;
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};
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