| // 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/thread.hpp> |
| #include <boost/thread/once.hpp> |
| #include <cassert> |
| |
| int value=0; |
| boost::once_flag once = BOOST_ONCE_INIT; |
| |
| void init() |
| { |
| ++value; |
| } |
| |
| void thread_proc() |
| { |
| boost::call_once(&init, once); |
| } |
| |
| int main(int argc, char* argv[]) |
| { |
| boost::thread_group threads; |
| for (int i=0; i<5; ++i) |
| threads.create_thread(&thread_proc); |
| threads.join_all(); |
| assert(value == 1); |
| } |