source: source/ariba/utility/transport/asio/unique_io_service.cpp@ 12460

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/**
 * @author Mario Hock <mario@omnifile.org>, Michael TÀnzer <neo@nhng.de>
 */

#include "unique_io_service.h"

#include <boost/asio.hpp>
#include <boost/thread.hpp>

namespace ariba {
namespace transport {
namespace detail {

using namespace std;


/* init static members */
boost::asio::io_service* unique_io_service::asio_io_service = NULL;
int unique_io_service::asio_io_service_ref_count = 0;
boost::thread* unique_io_service::thread = NULL;
int unique_io_service::run_count = 0;
boost::mutex unique_io_service::thread_stopped_mutex;
boost::condition_variable unique_io_service::thread_stopped_cond;
bool unique_io_service::thread_stopped = true;


unique_io_service::unique_io_service():
        running(false)
{
    if ( asio_io_service_ref_count == 0 )
    {
        asio_io_service = new boost::asio::io_service();
    }
    
    asio_io_service_ref_count++;
}



unique_io_service::~unique_io_service()
{
    assert( !running );
    
    asio_io_service_ref_count--;
    
    if ( asio_io_service_ref_count <= 0 )
    {
        delete asio_io_service;
        asio_io_service = NULL;
    }
}



boost::asio::io_service & unique_io_service::get_asio_io_service()
{
    assert(asio_io_service != NULL );
    
    return *asio_io_service;
}



void unique_io_service::start()
{
    assert(!running);
    
    boost::mutex::scoped_lock lock(thread_stopped_mutex);
    if (thread_stopped)
    {
        thread_stopped = false;
        thread = new boost::thread(&unique_io_service::thread_function);
    }
    
    run_count++;
    running = true;
}



void unique_io_service::stop()
{
    assert( running );
    
    running = false;
    run_count--;
    
    if ( run_count == 0 )
    {
        asio_io_service->stop();
        
        boost::mutex::scoped_lock lock(thread_stopped_mutex);
        while (!thread_stopped)
        {
            thread_stopped_cond.wait(lock);
        }
        delete thread;
    }
}


void unique_io_service::thread_function()
{
    asio_io_service->run();
    
    {
        boost::mutex::scoped_lock lock(thread_stopped_mutex);
        thread_stopped = true;
    }
    thread_stopped_cond.notify_one();
}


}}} // namespace ariba::transport::detail