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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 g_value=0;
#ifdef BOOST_THREAD_PROVIDES_ONCE_CXX11
static boost::once_flag g_once;
//static boost::once_flag g_once2 = BOOST_ONCE_INIT;
static boost::once_flag g_once = BOOST_ONCE_INIT;
//static boost::once_flag g_once2 = g_once;
void init()
    ++g_value;
void thread_proc()
    boost::call_once(&init, g_once);
    boost::thread_group threads;
    for (int i=0; i<5; ++i)
        threads.create_thread(&thread_proc);
    threads.join_all();
    assert(g_value == 1);

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