1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // UNSUPPORTED: no-threads 10 // UNSUPPORTED: c++03 11 12 // <future> 13 14 // class future<R> 15 16 // void wait() const; 17 18 #include <cassert> 19 #include <chrono> 20 #include <future> 21 #include <ratio> 22 23 #include "make_test_thread.h" 24 #include "test_macros.h" 25 func1(std::promise<int> p)26void func1(std::promise<int> p) 27 { 28 std::this_thread::sleep_for(std::chrono::milliseconds(500)); 29 p.set_value(3); 30 } 31 32 int j = 0; 33 func3(std::promise<int &> p)34void func3(std::promise<int&> p) 35 { 36 std::this_thread::sleep_for(std::chrono::milliseconds(500)); 37 j = 5; 38 p.set_value(j); 39 } 40 func5(std::promise<void> p)41void func5(std::promise<void> p) 42 { 43 std::this_thread::sleep_for(std::chrono::milliseconds(500)); 44 p.set_value(); 45 } 46 47 template <typename T, typename F> test(F func)48void test(F func) { 49 typedef std::chrono::high_resolution_clock Clock; 50 typedef std::chrono::duration<double, std::milli> ms; 51 52 std::promise<T> p; 53 std::future<T> f = p.get_future(); 54 support::make_test_thread(func, std::move(p)).detach(); 55 assert(f.valid()); 56 f.wait(); 57 assert(f.valid()); 58 Clock::time_point t0 = Clock::now(); 59 f.wait(); 60 Clock::time_point t1 = Clock::now(); 61 assert(f.valid()); 62 assert(t1-t0 < ms(5)); 63 } 64 main(int,char **)65int main(int, char**) 66 { 67 test<int>(func1); 68 test<int&>(func3); 69 test<void>(func5); 70 return 0; 71 } 72