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: libcpp-has-no-threads
10 // UNSUPPORTED: c++03
11 
12 // <future>
13 
14 // class future<R>
15 
16 // template <class Rep, class Period>
17 //   future_status
18 //   wait_for(const chrono::duration<Rep, Period>& rel_time) const;
19 
20 #include <future>
21 #include <cassert>
22 
23 #include "make_test_thread.h"
24 #include "test_macros.h"
25 
26 typedef std::chrono::milliseconds ms;
27 
28 static const ms sleepTime(500);
29 static const ms waitTime(5000);
30 
31 void func1(std::promise<int> p)
32 {
33   std::this_thread::sleep_for(sleepTime);
34   p.set_value(3);
35 }
36 
37 int j = 0;
38 
39 void func3(std::promise<int&> p)
40 {
41   std::this_thread::sleep_for(sleepTime);
42   j = 5;
43   p.set_value(j);
44 }
45 
46 void func5(std::promise<void> p)
47 {
48   std::this_thread::sleep_for(sleepTime);
49   p.set_value();
50 }
51 
52 template <typename T, typename F>
53 void test(F func, bool waitFirst) {
54   typedef std::chrono::high_resolution_clock Clock;
55   std::promise<T> p;
56   std::future<T> f = p.get_future();
57   Clock::time_point t1, t0 = Clock::now();
58   support::make_test_thread(func, std::move(p)).detach();
59   assert(f.valid());
60   assert(f.wait_for(ms(1)) == std::future_status::timeout);
61   assert(f.valid());
62   if (waitFirst) {
63     f.wait();
64     assert(f.valid());
65     t1 = Clock::now();
66     assert(f.wait_for(ms(waitTime)) == std::future_status::ready);
67     assert(f.valid());
68   } else {
69     assert(f.wait_for(ms(waitTime)) == std::future_status::ready);
70     assert(f.valid());
71     t1 = Clock::now();
72     f.wait();
73     assert(f.valid());
74   }
75   assert(t1 - t0 >= sleepTime);
76 }
77 
78 int main(int, char**)
79 {
80   test<int>(func1, true);
81   test<int&>(func3, true);
82   test<void>(func5, true);
83   test<int>(func1, false);
84   test<int&>(func3, false);
85   test<void>(func5, false);
86   return 0;
87 }
88