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 12 // <future> 13 14 // class future<R> 15 16 // void wait() const; 17 18 #include <future> 19 #include <cassert> 20 21 void func1(std::promise<int> p) 22 { 23 std::this_thread::sleep_for(std::chrono::milliseconds(500)); 24 p.set_value(3); 25 } 26 27 int j = 0; 28 29 void func3(std::promise<int&> p) 30 { 31 std::this_thread::sleep_for(std::chrono::milliseconds(500)); 32 j = 5; 33 p.set_value(j); 34 } 35 36 void func5(std::promise<void> p) 37 { 38 std::this_thread::sleep_for(std::chrono::milliseconds(500)); 39 p.set_value(); 40 } 41 42 int main() 43 { 44 typedef std::chrono::high_resolution_clock Clock; 45 typedef std::chrono::duration<double, std::milli> ms; 46 { 47 typedef int T; 48 std::promise<T> p; 49 std::future<T> f = p.get_future(); 50 std::thread(func1, std::move(p)).detach(); 51 assert(f.valid()); 52 f.wait(); 53 assert(f.valid()); 54 Clock::time_point t0 = Clock::now(); 55 f.wait(); 56 Clock::time_point t1 = Clock::now(); 57 assert(f.valid()); 58 assert(t1-t0 < ms(5)); 59 } 60 { 61 typedef int& T; 62 std::promise<T> p; 63 std::future<T> f = p.get_future(); 64 std::thread(func3, std::move(p)).detach(); 65 assert(f.valid()); 66 f.wait(); 67 assert(f.valid()); 68 Clock::time_point t0 = Clock::now(); 69 f.wait(); 70 Clock::time_point t1 = Clock::now(); 71 assert(f.valid()); 72 assert(t1-t0 < ms(5)); 73 } 74 { 75 typedef void T; 76 std::promise<T> p; 77 std::future<T> f = p.get_future(); 78 std::thread(func5, std::move(p)).detach(); 79 assert(f.valid()); 80 f.wait(); 81 assert(f.valid()); 82 Clock::time_point t0 = Clock::now(); 83 f.wait(); 84 Clock::time_point t1 = Clock::now(); 85 assert(f.valid()); 86 assert(t1-t0 < ms(5)); 87 } 88 } 89
