Dan Albert | 287553d | 2017-02-16 10:47:51 -0800 | [diff] [blame] | 1 | //===----------------------------------------------------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | // Source Licenses. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // UNSUPPORTED: libcpp-has-no-threads |
| 11 | // UNSUPPORTED: c++98, c++03 |
| 12 | |
| 13 | // <future> |
| 14 | |
| 15 | // class future<R> |
| 16 | |
| 17 | // void wait() const; |
| 18 | |
| 19 | #include <future> |
| 20 | #include <cassert> |
| 21 | |
| 22 | void func1(std::promise<int> p) |
| 23 | { |
| 24 | std::this_thread::sleep_for(std::chrono::milliseconds(500)); |
| 25 | p.set_value(3); |
| 26 | } |
| 27 | |
| 28 | int j = 0; |
| 29 | |
| 30 | void func3(std::promise<int&> p) |
| 31 | { |
| 32 | std::this_thread::sleep_for(std::chrono::milliseconds(500)); |
| 33 | j = 5; |
| 34 | p.set_value(j); |
| 35 | } |
| 36 | |
| 37 | void func5(std::promise<void> p) |
| 38 | { |
| 39 | std::this_thread::sleep_for(std::chrono::milliseconds(500)); |
| 40 | p.set_value(); |
| 41 | } |
| 42 | |
| 43 | int main() |
| 44 | { |
| 45 | typedef std::chrono::high_resolution_clock Clock; |
| 46 | typedef std::chrono::duration<double, std::milli> ms; |
| 47 | { |
| 48 | typedef int T; |
| 49 | std::promise<T> p; |
| 50 | std::future<T> f = p.get_future(); |
| 51 | std::thread(func1, std::move(p)).detach(); |
| 52 | assert(f.valid()); |
| 53 | f.wait(); |
| 54 | assert(f.valid()); |
| 55 | Clock::time_point t0 = Clock::now(); |
| 56 | f.wait(); |
| 57 | Clock::time_point t1 = Clock::now(); |
| 58 | assert(f.valid()); |
| 59 | assert(t1-t0 < ms(5)); |
| 60 | } |
| 61 | { |
| 62 | typedef int& T; |
| 63 | std::promise<T> p; |
| 64 | std::future<T> f = p.get_future(); |
| 65 | std::thread(func3, std::move(p)).detach(); |
| 66 | assert(f.valid()); |
| 67 | f.wait(); |
| 68 | assert(f.valid()); |
| 69 | Clock::time_point t0 = Clock::now(); |
| 70 | f.wait(); |
| 71 | Clock::time_point t1 = Clock::now(); |
| 72 | assert(f.valid()); |
| 73 | assert(t1-t0 < ms(5)); |
| 74 | } |
| 75 | { |
| 76 | typedef void T; |
| 77 | std::promise<T> p; |
| 78 | std::future<T> f = p.get_future(); |
| 79 | std::thread(func5, std::move(p)).detach(); |
| 80 | assert(f.valid()); |
| 81 | f.wait(); |
| 82 | assert(f.valid()); |
| 83 | Clock::time_point t0 = Clock::now(); |
| 84 | f.wait(); |
| 85 | Clock::time_point t1 = Clock::now(); |
| 86 | assert(f.valid()); |
| 87 | assert(t1-t0 < ms(5)); |
| 88 | } |
| 89 | } |