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ROBLOX2016
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Library/boost/libs/thread/test/test_9319.cpp
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19 дек 2024, 19:11
19 дек 2024, 19:11
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// Copyright (C) 2013 Vicente Botet // // 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) // futtest.cpp #include <iostream> #define BOOST_THREAD_VERSION 4 #include <boost/thread/future.hpp> #include <boost/thread/thread.hpp> #include <boost/bind/bind.hpp> #include <boost/chrono.hpp> #include <boost/shared_ptr.hpp> #include <boost/scoped_ptr.hpp> typedef boost::shared_ptr< boost::promise<int> > IntPromise; void foo(IntPromise p) { std::cout << "foo" << std::endl; p->set_value(123); // This line locks the future's mutex, then calls the continuation with the mutex already locked. } void bar(boost::future<int> fooResult) { try { std::cout << "bar" << std::endl; int i = fooResult.get(); // Code hangs on this line (Due to future already being locked by the set_value call) std::cout << "i: " << i << std::endl; } catch(...) { std::cout << __FILE__ << ":" << __LINE__ << std::endl; } } int main() { std::cout << __FILE__ << ":" << __LINE__ << std::endl; try { IntPromise p(new boost::promise<int>()); boost::thread t(boost::bind(foo, p)); boost::future<int> f1 = p->get_future(); f1.then(boost::launch::deferred, &bar); t.join(); } catch(...) { return 1; } std::cout << __FILE__ << ":" << __LINE__ << std::endl; try { IntPromise p(new boost::promise<int>()); boost::thread t(boost::bind(foo, p)); boost::future<int> f1 = p->get_future(); f1.then(boost::launch::async, &bar); t.join(); } catch(...) { return 2; } std::cout << __FILE__ << ":" << __LINE__ << std::endl; }