Boost.Threads question

From: James Zappia (James.Zappia_at_[hidden])
Date: 2002-12-04 03:57:49

Hi,

I'm a newbie to C++ and Boost and I'm trying to port a threaded C program I
have to Boost.Threads.  I'm trying to use scoped_try_lock to test a lock on
mutex and it's not working.  I'm obviously doing something wrong but I can't
figure it out.  Below is the source code.  Any help would be greatly
appreciated.

Thanks,
James

SOURCE:

#include <iostream>
#include <boost/thread/thread.hpp>
#include <boost/thread/exceptions.hpp>

using namespace std;

boost::try_mutex mutex;

void thread_test( void )
{
        cout << "thread: locking mutex\n";

        {
                boost::try_mutex::scoped_try_lock lock(mutex);
                cout << "thread: sleeping for 10 seconds\n";
                sleep(10);
        }

        cout << "thread: unlocked mutex - goodbye!\n";

        return;
}

int main( void )
{
        cout << "main: creating thread\n";
        boost::thread thread(thread_test);

        cout << "main: sleeping for 2 seconds\n";
        sleep(2);

        cout << "main: trying to lock mutex\n";
        boost::try_mutex::scoped_try_lock lock(mutex,true);

        while ( !lock.try_lock() )
                cout << "main: retrying to lock mutex\n";

        cout << "main: joining thread\n";
        thread.join();

        cout << "main: thread joined\n";
        return 0;
}