request_queue_impl_worker.h

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/***************************************************************************
 *  include/stxxl/bits/io/request_queue_impl_worker.h
 *
 *  Part of the STXXL. See http://stxxl.sourceforge.net
 *
 *  Copyright (C) 2002 Roman Dementiev <[email protected]>
 *  Copyright (C) 2008, 2009 Andreas Beckmann <[email protected]>
 *  Copyright (C) 2009 Johannes Singler <[email protected]>
 *  Copyright (C) 2013 Timo Bingmann <[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_IO_REQUEST_QUEUE_IMPL_WORKER_HEADER
#define STXXL_IO_REQUEST_QUEUE_IMPL_WORKER_HEADER

#include <stxxl/bits/config.h>

#if STXXL_STD_THREADS
 #include <thread>
#elif STXXL_BOOST_THREADS
 #include <boost/thread/thread.hpp>
#elif STXXL_POSIX_THREADS
 #include <pthread.h>
#else
 #error "Thread implementation not detected."
#endif

#include <stxxl/bits/io/request_queue.h>
#include <stxxl/bits/common/semaphore.h>
#include <stxxl/bits/common/state.h>

STXXL_BEGIN_NAMESPACE

//! \addtogroup reqlayer
//! \{

//! Implementation of request queue worker threads. Worker threads can be
//! started by start_thread and stopped with stop_thread. The queue state is
//! checked before termination and updated afterwards.
class request_queue_impl_worker : public request_queue
{
protected:
    enum thread_state { NOT_RUNNING, RUNNING, TERMINATING, TERMINATED };

#if STXXL_STD_THREADS
    typedef std::thread* thread_type;
#elif STXXL_BOOST_THREADS
    typedef boost::thread* thread_type;
#else
    typedef pthread_t thread_type;
#endif

protected:
    void start_thread(void* (*worker)(void*), void* arg, thread_type& t, state<thread_state>& s);
    void stop_thread(thread_type& t, state<thread_state>& s, semaphore& sem);
};

//! \}

STXXL_END_NAMESPACE

#endif // !STXXL_IO_REQUEST_QUEUE_IMPL_WORKER_HEADER
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