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 shared_future<R> 16 17 // void wait() const; 18 19 #include <future> 20 #include <cassert> 21 func1(std::promise<int> p)22void 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 func3(std::promise<int &> p)30void 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 func5(std::promise<void> p)37void func5(std::promise<void> p) 38 { 39 std::this_thread::sleep_for(std::chrono::milliseconds(500)); 40 p.set_value(); 41 } 42 main()43int 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::shared_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::shared_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::shared_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 } 90