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/*
* Copyright 2011 Google Inc. All Rights Reserved.
*
* 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 SFNTLY_CPP_SRC_SFNTLY_PORT_LOCK_H_
#define SFNTLY_CPP_SRC_SFNTLY_PORT_LOCK_H_
#if defined (WIN32)
#include <windows.h>
#else // Assume pthread.
#include <pthread.h>
#include <errno.h>
#endif
#include "sfntly/port/type.h"
namespace sfntly {
#if defined (WIN32)
typedef CRITICAL_SECTION OSLockType;
#else // Assume pthread.
typedef pthread_mutex_t OSLockType;
#endif
class Lock {
public:
Lock();
~Lock();
// If the lock is not held, take it and return true. If the lock is already
// held by something else, immediately return false.
bool Try();
// Take the lock, blocking until it is available if necessary.
void Acquire();
// Release the lock. This must only be called by the lock's holder: after
// a successful call to Try, or a call to Lock.
void Unlock();
private:
OSLockType os_lock_;
NO_COPY_AND_ASSIGN(Lock);
};
// A helper class that acquires the given Lock while the AutoLock is in scope.
class AutoLock {
public:
explicit AutoLock(Lock& lock) : lock_(lock) {
lock_.Acquire();
}
~AutoLock() {
lock_.Unlock();
}
private:
Lock& lock_;
NO_COPY_AND_ASSIGN(AutoLock);
};
} // namespace sfntly
#endif // SFNTLY_CPP_SRC_SFNTLY_PORT_LOCK_H_
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