Mutex.h

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//
// Copyright (c) 2009, Markus Rickert
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
 
#ifndef _RL_UTIL_MUTEX_H_
#define _RL_UTIL_MUTEX_H_
 
#ifdef WIN32
#include <windows.h>
#else // WIN32
#include <errno.h>
#include <pthread.h>
#endif // WIN32
 
namespace rl
{
    namespace util
    {
        class Mutex
        {
        public:
            explicit Mutex() :
                mutex()
            {
#ifdef WIN32
                InitializeCriticalSection(&(*this).mutex);
#else // WIN32
                pthread_mutex_init(&(*this).mutex, NULL);
#endif // WIN32
            }
            
            virtual ~Mutex()
            {
#ifdef WIN32
                DeleteCriticalSection(&(*this).mutex);
#else // WIN32
                pthread_mutex_destroy(&(*this).mutex);
#endif // WIN32
            }
            
            Mutex& operator++()
            {
                (*this).unlock();
                return (*this);
            }
            
            Mutex& operator--()
            {
                (*this).lock();
                return (*this);
            }
            
            void lock()
            {
#ifdef WIN32
                EnterCriticalSection(&(*this).mutex);
#else // WIN32
                pthread_mutex_lock(&(*this).mutex);
#endif // WIN32
            }
            
            bool tryLock()
            {
#ifdef WIN32
                return TryEnterCriticalSection(&(*this).mutex) ? true : false; 
#else // WIN32
                return pthread_mutex_trylock(&(*this).mutex) == EBUSY ? false : true;
#endif // WIN32
            }
            
            void unlock()
            {
#ifdef WIN32
                LeaveCriticalSection(&(*this).mutex);
#else // WIN32
                pthread_mutex_unlock(&(*this).mutex);
#endif // WIN32
            }
            
        protected:
            
        private:
#ifdef WIN32
            CRITICAL_SECTION mutex;
#else // WIN32
            pthread_mutex_t mutex;
#endif // WIN32
        };
    }
}
 
#endif // _RL_UTIL_MUTEX_H_