29 lines
655 B
C++
29 lines
655 B
C++
// 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();
|
|
}
|