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  • Committer: Package Import Robot
  • Author(s): Steve M. Robbins
  • Date: 2012-02-26 00:31:44 UTC
  • Revision ID: package-import@ubuntu.com-20120226003144-eaytp12cbf6ubpms
Tags: upstream-1.49.0
Import upstream version 1.49.0

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libs/thread/tutorial/counter.cpp
 
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// Copyright (C) 2001-2003
 
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// William E. Kempf
 
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//
 
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//  Distributed under the Boost Software License, Version 1.0. (See accompanying 
 
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//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
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#include <boost/thread/mutex.hpp>
 
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#include <boost/thread/thread.hpp>
 
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#include <iostream>
 
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boost::mutex mutex;
 
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int counter=0;
 
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void change_count()
 
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{
 
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    boost::mutex::scoped_lock lock(mutex);
 
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    int i = ++counter;
 
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    std::cout << "count == " << i << std::endl;
 
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}
 
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int main()
 
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{
 
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    const int num_threads = 4;
 
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    boost::thread_group thrds;
 
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    for (int i=0; i < num_threads; ++i)
 
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        thrds.create_thread(&change_count);
 
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    thrds.join_all();
 
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}