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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#ifdef _WIN32
#include "mongo/platform/windows_basic.h"
#else
#include <pthread.h>
#endif
#include "mongo/util/assert_util.h"
namespace mongo {
/** The concept with SimpleMutex is that it is a basic lock/unlock
* with no special functionality (such as try and try
* timeout). Thus it can be implemented using OS-specific
* facilities in all environments (if desired). On Windows,
* the implementation below is faster than boost mutex.
*/
#if defined(_WIN32)
class SimpleMutex {
SimpleMutex(const SimpleMutex&) = delete;
SimpleMutex& operator=(const SimpleMutex&) = delete;
public:
SimpleMutex() {
InitializeCriticalSection(&_cs);
}
~SimpleMutex() {
DeleteCriticalSection(&_cs);
}
void lock() {
EnterCriticalSection(&_cs);
}
void unlock() {
LeaveCriticalSection(&_cs);
}
private:
CRITICAL_SECTION _cs;
};
#else
class SimpleMutex {
SimpleMutex(const SimpleMutex&) = delete;
SimpleMutex& operator=(const SimpleMutex&) = delete;
public:
SimpleMutex() {
verify(pthread_mutex_init(&_lock, nullptr) == 0);
}
~SimpleMutex() {
verify(pthread_mutex_destroy(&_lock) == 0);
}
void lock() {
verify(pthread_mutex_lock(&_lock) == 0);
}
void unlock() {
verify(pthread_mutex_unlock(&_lock) == 0);
}
private:
pthread_mutex_t _lock;
};
#endif
} // namespace mongo
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