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/* -*- C++ -*- */
/****************************************************************************
** Copyright (c) 2001-2014
**
** This file is part of the QuickFIX FIX Engine
**
** This file may be distributed under the terms of the quickfixengine.org
** license as defined by quickfixengine.org and appearing in the file
** LICENSE included in the packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.quickfixengine.org/LICENSE for licensing information.
**
** Contact ask@quickfixengine.org if any conditions of this licensing are
** not clear to you.
**
****************************************************************************/
#ifndef FIX_MUTEX_H
#define FIX_MUTEX_H
#include "Utility.h"
namespace FIX {
/// Portable implementation of a mutex.
class Mutex {
public:
Mutex() {
#ifdef _MSC_VER
InitializeCriticalSection(&m_mutex);
#else
m_count = 0;
m_threadID = 0;
// pthread_mutexattr_t attr;
// pthread_mutexattr_init(&attr);
// pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
// pthread_mutex_init(&m_mutex, &attr);
pthread_mutex_init(&m_mutex, 0);
#endif
}
~Mutex() {
#ifdef _MSC_VER
DeleteCriticalSection(&m_mutex);
#else
pthread_mutex_destroy(&m_mutex);
#endif
}
void lock() {
#ifdef _MSC_VER
EnterCriticalSection(&m_mutex);
#else
if (m_count && m_threadID == pthread_self()) {
++m_count;
return;
}
pthread_mutex_lock(&m_mutex);
++m_count;
m_threadID = pthread_self();
#endif
}
void unlock() {
#ifdef _MSC_VER
LeaveCriticalSection(&m_mutex);
#else
if (m_count > 1) {
m_count--;
return;
}
--m_count;
m_threadID = 0;
pthread_mutex_unlock(&m_mutex);
#endif
}
private:
#ifdef _MSC_VER
CRITICAL_SECTION m_mutex;
#else
pthread_mutex_t m_mutex;
pthread_t m_threadID;
int m_count;
#endif
};
/// Locks/Unlocks a mutex using RAII.
class Locker {
public:
Locker(Mutex &mutex)
: m_mutex(mutex) {
m_mutex.lock();
}
~Locker() { m_mutex.unlock(); }
private:
Mutex &m_mutex;
};
/// Does the opposite of the Locker to ensure mutex ends up in a locked state.
class ReverseLocker {
public:
ReverseLocker(Mutex &mutex)
: m_mutex(mutex) {
m_mutex.unlock();
}
~ReverseLocker() { m_mutex.lock(); }
private:
Mutex &m_mutex;
};
} // namespace FIX
#endif