61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
// Copyright (C) 2013 Vicente Botet
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// futtest.cpp
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#include <iostream>
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#define BOOST_THREAD_VERSION 4
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#include <boost/thread/future.hpp>
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#include <boost/thread/thread.hpp>
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#include <boost/bind.hpp>
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#include <boost/chrono.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/scoped_ptr.hpp>
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typedef boost::shared_ptr< boost::promise<int> > IntPromise;
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void foo(IntPromise p)
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{
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std::cout << "foo" << std::endl;
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p->set_value(123); // This line locks the future's mutex, then calls the continuation with the mutex already locked.
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}
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void bar(boost::future<int> fooResult)
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{
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try {
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std::cout << "bar" << std::endl;
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int i = fooResult.get(); // Code hangs on this line (Due to future already being locked by the set_value call)
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std::cout << "i: " << i << std::endl;
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} catch(...) {
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std::cout << __FILE__ << ":" << __LINE__ << std::endl;
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}
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}
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int main()
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{
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std::cout << __FILE__ << ":" << __LINE__ << std::endl;
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try {
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IntPromise p(new boost::promise<int>());
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boost::thread t(boost::bind(foo, p));
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boost::future<int> f1 = p->get_future();
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f1.then(boost::launch::deferred, &bar);
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t.join();
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} catch(...) {
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return 1;
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}
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std::cout << __FILE__ << ":" << __LINE__ << std::endl;
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try {
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IntPromise p(new boost::promise<int>());
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boost::thread t(boost::bind(foo, p));
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boost::future<int> f1 = p->get_future();
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f1.then(boost::launch::async, &bar);
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t.join();
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} catch(...) {
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return 2;
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}
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std::cout << __FILE__ << ":" << __LINE__ << std::endl;
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}
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