mutex.h

/***************************************************************************
 *  include/stxxl/bits/common/mutex.h
 *
 *  Part of the STXXL. See http://stxxl.sourceforge.net
 *
 *  Copyright (C) 2002 Roman Dementiev <[email protected]>
 *
 *  Distributed under the Boost Software License, Version 1.0.
 *  (See accompanying file LICENSE_1_0.txt or copy at
 *  http://www.boost.org/LICENSE_1_0.txt)
 **************************************************************************/

#ifndef STXXL_MUTEX_HEADER
#define STXXL_MUTEX_HEADER

#include <stxxl/bits/namespace.h>

#ifdef STXXL_BOOST_THREADS

 #include <boost/thread/mutex.hpp>

#else

 #include <pthread.h>

 #include <stxxl/bits/noncopyable.h>
 #include <stxxl/bits/common/utils.h>

#endif


__STXXL_BEGIN_NAMESPACE

#ifdef STXXL_BOOST_THREADS

// stxxl::mutex is not needed since boost:mutex exists

#else

class mutex : private noncopyable
{
    pthread_mutex_t _mutex;

public:
    mutex()
    {
        check_pthread_call(pthread_mutex_init(&_mutex, NULL));
    }

    ~mutex()
    {
        int res = pthread_mutex_trylock(&_mutex);

        if (res == 0 || res == EBUSY) {
            check_pthread_call(pthread_mutex_unlock(&_mutex));
        } else
            stxxl_function_error(resource_error);

        check_pthread_call(pthread_mutex_destroy(&_mutex));
    }
    void lock()
    {
        check_pthread_call(pthread_mutex_lock(&_mutex));
    }
    void unlock()
    {
        check_pthread_call(pthread_mutex_unlock(&_mutex));
    }
};

#endif

__STXXL_END_NAMESPACE

#endif // !STXXL_MUTEX_HEADER

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