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// Copyright (C) 2001-2003
// William E. Kempf
//  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)
#include <boost/thread/mutex.hpp>
#include <boost/thread/thread.hpp>
#include <iostream>
boost::mutex g_io_mutex; // The iostreams are not guaranteed to be thread-safe!
class counter
    counter() : count(0) { }
    int increment() {
        boost::unique_lock<boost::mutex> scoped_lock(mutex);
        return ++count;
    boost::mutex mutex;
    int count;
counter g_counter;
void change_count()
    int i = g_counter.increment();
    boost::unique_lock<boost::mutex> scoped_lock(g_io_mutex);
    std::cout << "count == " << i << std::endl;
int main(int, char*[])
    const int num_threads = 4;
    boost::thread_group thrds;
    for (int i=0; i < num_threads; ++i)
        thrds.create_thread(&change_count);
    thrds.join_all();
    return 0;

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