Re: [Boost-users] [Boost.thread] Simultaneously starting threadexecution

From: Patrick Loney (Patrick.Loney_at_[hidden])
Date: 2008-08-06 10:45:44

I wrote the following to do some volume testing on a service, may help
you:

boost::mutex mutex;
bool testthreads( std::string& mdoid, std::vector<unsigned char>&
userpin )
{
    boost::mutex::scoped_lock lock( mutex );//wait for the main thread
to say go
    lock.unlock();//release mutex immediately to allow other threads to
start

    performOp();
    
    return true;
}

bool testmultithreaded()
{
    printf( "Please enter thread count [1-2048] : " );
    std::string input;
    std::cin >> input;
    unsigned long encCnt = std::strtoul( input.c_str(), NULL, 0 );
    if( encCnt == 0 || encCnt > 2048 ) {
        printf( "Thread count out of range" );
        return false;
    }

    const int threadCnt = encCnt;
    std::vector<boost::shared_ptr<boost::thread>> threads;

    boost::timer t;
    boost::mutex::scoped_lock lock( mutex );//lock the mutex to stop
threads from starting

    for( int i = 0; i < threadCnt; ++i )
    {
        threads.push_back( boost::shared_ptr<boost::thread>( new
boost::thread ( boost::bind( &testthreads, mdoid, userpin ) ) ) );
    }

    double threadscreated = t.elapsed();
    lock.unlock();//start the threads off

    for( int i = 0; i < threadCnt; ++i )
    {
        threads[i]->join();//wait for each thread to finish
    }

    double threadsFinished = t.elapsed();

    boost::mutex::scoped_lock hmilock(hmiMutex);
    printf( "%lu threads completed\n", encCnt );
    printf( "Threads created in %f seconds\n", threadscreated );
    printf( "Threads completed in %f seconds\n", threadsFinished -
threadscreated );

    return true;
}

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