// 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 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();}
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