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// 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 mutex;

int counter=0;

void change_count()

{

boost::mutex::scoped_lock lock(mutex);

int i = ++counter;

std::cout << "count == " << i << std::endl;

}

int main()

{

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();

}