Dr. Dobb's | The Boost.Threads Library


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April 15, 2003

The Boost.Threads Library

(Page 7 of 7)

May 2002/The Boost.Threads Library/Listing 6

Listing 6: A very simple use of boost::call_once

#include <boost/thread/thread.hpp>
#include <boost/thread/once.hpp>
#include <iostream>

int i = 0;
boost::once_flag flag =
  BOOST_ONCE_INIT;

void init()
{
  ++i;
}

void thread()
{
  boost::call_once(&init, flag);
}

int main(int argc, char* argv[])
{
  boost::thread thrd1(&thread);
  boost::thread thrd2(&thread);
  thrd1.join();
  thrd2.join();
  std::cout << i << std::endl;
  return 0;
}
— End of Listing —

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