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7c673cae FG |
1 | // Copyright (C) 2013 Vicente Botet |
2 | // | |
3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
5 | ||
6 | // futtest.cpp | |
7 | #include <iostream> | |
8 | #define BOOST_THREAD_VERSION 4 | |
9 | ||
10 | #include <boost/thread/future.hpp> | |
11 | #include <boost/thread/thread.hpp> | |
f67539c2 | 12 | #include <boost/bind/bind.hpp> |
7c673cae FG |
13 | #include <boost/chrono.hpp> |
14 | #include <boost/shared_ptr.hpp> | |
15 | #include <boost/scoped_ptr.hpp> | |
16 | ||
17 | typedef boost::shared_ptr< boost::promise<int> > IntPromise; | |
18 | ||
19 | void foo(IntPromise p) | |
20 | { | |
21 | std::cout << "foo" << std::endl; | |
22 | p->set_value(123); // This line locks the future's mutex, then calls the continuation with the mutex already locked. | |
23 | } | |
24 | ||
25 | void bar(boost::future<int> fooResult) | |
26 | { | |
27 | try { | |
28 | std::cout << "bar" << std::endl; | |
29 | int i = fooResult.get(); // Code hangs on this line (Due to future already being locked by the set_value call) | |
30 | std::cout << "i: " << i << std::endl; | |
31 | } catch(...) { | |
32 | std::cout << __FILE__ << ":" << __LINE__ << std::endl; | |
33 | } | |
34 | } | |
35 | ||
36 | int main() | |
37 | { | |
38 | std::cout << __FILE__ << ":" << __LINE__ << std::endl; | |
39 | try { | |
40 | IntPromise p(new boost::promise<int>()); | |
41 | boost::thread t(boost::bind(foo, p)); | |
42 | boost::future<int> f1 = p->get_future(); | |
43 | f1.then(boost::launch::deferred, &bar); | |
44 | t.join(); | |
45 | } catch(...) { | |
46 | return 1; | |
47 | } | |
48 | std::cout << __FILE__ << ":" << __LINE__ << std::endl; | |
49 | try { | |
50 | IntPromise p(new boost::promise<int>()); | |
51 | boost::thread t(boost::bind(foo, p)); | |
52 | boost::future<int> f1 = p->get_future(); | |
53 | f1.then(boost::launch::async, &bar); | |
54 | t.join(); | |
55 | } catch(...) { | |
56 | return 2; | |
57 | } | |
58 | std::cout << __FILE__ << ":" << __LINE__ << std::endl; | |
59 | } | |
60 |