95 lines
1.9 KiB
C++
95 lines
1.9 KiB
C++
// Copyright (C) 2014 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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#ifndef EMUGL_MUTEX_H
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#define EMUGL_MUTEX_H
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#ifdef _WIN32
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# define WIN32_LEAN_AND_MEAN 1
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# include <windows.h>
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#else
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# include <pthread.h>
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#endif
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namespace emugl {
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class ConditionVariable;
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// Simple wrapper class for mutexes.
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class Mutex {
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public:
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// Constructor.
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Mutex() {
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#ifdef _WIN32
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::InitializeCriticalSection(&mLock);
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#else
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::pthread_mutex_init(&mLock, NULL);
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#endif
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}
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// Destructor.
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~Mutex() {
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#ifdef _WIN32
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::DeleteCriticalSection(&mLock);
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#else
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::pthread_mutex_destroy(&mLock);
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#endif
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}
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// Acquire the mutex.
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void lock() {
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#ifdef _WIN32
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::EnterCriticalSection(&mLock);
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#else
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::pthread_mutex_lock(&mLock);
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#endif
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}
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// Release the mutex.
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void unlock() {
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#ifdef _WIN32
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::LeaveCriticalSection(&mLock);
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#else
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::pthread_mutex_unlock(&mLock);
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#endif
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}
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// Helper class to lock / unlock a mutex automatically on scope
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// entry and exit.
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class AutoLock {
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public:
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AutoLock(Mutex& mutex) : mMutex(&mutex) {
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mMutex->lock();
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}
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~AutoLock() {
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mMutex->unlock();
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}
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private:
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Mutex* mMutex;
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};
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private:
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#ifdef _WIN32
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CRITICAL_SECTION mLock;
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#else
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friend class ConditionVariable;
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pthread_mutex_t mLock;
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#endif
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};
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} // namespace emugl
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#endif // EMUGL_MUTEX_H
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