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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)
- #define BOOST_THREAD_PROVIDES_ONCE_CXX11
- #include <boost/thread/thread.hpp>
- #include <boost/thread/once.hpp>
- #include <cassert>
- int value=0;
- #ifdef BOOST_THREAD_PROVIDES_ONCE_CXX11
- static boost::once_flag once;
- //static boost::once_flag once2 = BOOST_ONCE_INIT;
- #else
- static boost::once_flag once = BOOST_ONCE_INIT;
- //static boost::once_flag once2 = once;
- #endif
- void init()
- {
- ++value;
- }
- void thread_proc()
- {
- boost::call_once(&init, once);
- }
- int main()
- {
- boost::thread_group threads;
- for (int i=0; i<5; ++i)
- threads.create_thread(&thread_proc);
- threads.join_all();
- assert(value == 1);
- }
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