join.cpp
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// Copyright Oliver Kowalke 2013.
// 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 <cstdlib>
#include <functional>
#include <stdexcept>
#include <iostream>
#include <string>
#include <boost/fiber/all.hpp>
int value1 = 0;
int value2 = 0;
void fn1()
{
boost::fibers::fiber::id this_id = boost::this_fiber::get_id();
for ( int i = 0; i < 5; ++i)
{
++value1;
std::cout << "fiber " << this_id << " fn1: increment value1: " << value1 << std::endl;
boost::this_fiber::yield();
}
std::cout << "fiber " << this_id << " fn1: returns" << std::endl;
}
void fn2( boost::fibers::fiber & f)
{
boost::fibers::fiber::id this_id = boost::this_fiber::get_id();
for ( int i = 0; i < 5; ++i)
{
++value2;
std::cout << "fiber " << this_id << " fn2: increment value2: " << value2 << std::endl;
if ( i == 1)
{
boost::fibers::fiber::id id = f.get_id();
std::cout << "fiber " << this_id << " fn2: joins fiber " << id << std::endl;
f.join();
std::cout << "fiber " << this_id << " fn2: joined fiber " << id << std::endl;
}
boost::this_fiber::yield();
}
std::cout << "fiber " << this_id << " fn2: returns" << std::endl;
}
int main()
{
try
{
boost::fibers::fiber f1( fn1);
boost::fibers::fiber f2( fn2, std::ref( f1) );
f2.join();
std::cout << "done." << std::endl;
return EXIT_SUCCESS;
}
catch ( std::exception const& e)
{ std::cerr << "exception: " << e.what() << std::endl; }
catch (...)
{ std::cerr << "unhandled exception" << std::endl; }
return EXIT_FAILURE;
}