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 // <future> 11 12 // class future<R> 13 14 // template <class Rep, class Period> 15 // future_status 16 // wait_for(const chrono::duration<Rep, Period>& rel_time) const; 17 18 #include <future> 19 #include <cassert> 20 21 typedef std::chrono::milliseconds ms; 22 23 void func1(std::promise<int> p) 24 { 25 std::this_thread::sleep_for(ms(500)); 26 p.set_value(3); 27 } 28 29 int j = 0; 30 31 void func3(std::promise<int&> p) 32 { 33 std::this_thread::sleep_for(ms(500)); 34 j = 5; 35 p.set_value(j); 36 } 37 38 void func5(std::promise<void> p) 39 { 40 std::this_thread::sleep_for(ms(500)); 41 p.set_value(); 42 } 43 44 int main() 45 { 46 typedef std::chrono::high_resolution_clock Clock; 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 assert(f.wait_for(ms(300)) == std::future_status::timeout); 54 assert(f.valid()); 55 assert(f.wait_for(ms(300)) == std::future_status::ready); 56 assert(f.valid()); 57 Clock::time_point t0 = Clock::now(); 58 f.wait(); 59 Clock::time_point t1 = Clock::now(); 60 assert(f.valid()); 61 assert(t1-t0 < ms(50)); 62 } 63 { 64 typedef int& T; 65 std::promise<T> p; 66 std::future<T> f = p.get_future(); 67 std::thread(func3, std::move(p)).detach(); 68 assert(f.valid()); 69 assert(f.wait_for(ms(300)) == std::future_status::timeout); 70 assert(f.valid()); 71 assert(f.wait_for(ms(300)) == std::future_status::ready); 72 assert(f.valid()); 73 Clock::time_point t0 = Clock::now(); 74 f.wait(); 75 Clock::time_point t1 = Clock::now(); 76 assert(f.valid()); 77 assert(t1-t0 < ms(50)); 78 } 79 { 80 typedef void T; 81 std::promise<T> p; 82 std::future<T> f = p.get_future(); 83 std::thread(func5, std::move(p)).detach(); 84 assert(f.valid()); 85 assert(f.wait_for(ms(300)) == std::future_status::timeout); 86 assert(f.valid()); 87 assert(f.wait_for(ms(300)) == std::future_status::ready); 88 assert(f.valid()); 89 Clock::time_point t0 = Clock::now(); 90 f.wait(); 91 Clock::time_point t1 = Clock::now(); 92 assert(f.valid()); 93 assert(t1-t0 < ms(50)); 94 } 95 } 96
