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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 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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