40 lines
830 B
C++
40 lines
830 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)
|
|
|
|
#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);
|
|
}
|