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 shared_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 <cassert>
21 #include <chrono>
22 #include <future>
23 
24 #include "make_test_thread.h"
25 #include "test_macros.h"
26 
27 typedef std::chrono::milliseconds ms;
28 
29 static const ms sleepTime(500);
30 static const ms waitTime(5000);
31 
32 void func1(std::promise<int> p)
33 {
34   std::this_thread::sleep_for(sleepTime);
35   p.set_value(3);
36 }
37 
38 int j = 0;
39 
40 void func3(std::promise<int&> p)
41 {
42   std::this_thread::sleep_for(sleepTime);
43   j = 5;
44   p.set_value(j);
45 }
46 
47 void func5(std::promise<void> p)
48 {
49   std::this_thread::sleep_for(sleepTime);
50   p.set_value();
51 }
52 
53 int main(int, char**)
54 {
55   typedef std::chrono::high_resolution_clock Clock;
56 
57   {
58     typedef int T;
59     std::promise<T> p;
60     std::shared_future<T> f = p.get_future();
61     support::make_test_thread(func1, std::move(p)).detach();
62     assert(f.valid());
63     assert(f.wait_for(ms(1)) == std::future_status::timeout);
64     assert(f.valid());
65     assert(f.wait_for(waitTime) == std::future_status::ready);
66     assert(f.valid());
67     f.wait();
68     assert(f.valid());
69   }
70   {
71     typedef int& T;
72     std::promise<T> p;
73     std::shared_future<T> f = p.get_future();
74     support::make_test_thread(func3, std::move(p)).detach();
75     assert(f.valid());
76     assert(f.wait_for(ms(1)) == std::future_status::timeout);
77     assert(f.valid());
78     assert(f.wait_for(waitTime) == std::future_status::ready);
79     assert(f.valid());
80     f.wait();
81     assert(f.valid());
82   }
83   {
84     typedef void T;
85     std::promise<T> p;
86     std::shared_future<T> f = p.get_future();
87     support::make_test_thread(func5, std::move(p)).detach();
88     assert(f.valid());
89     assert(f.wait_for(ms(1)) == std::future_status::timeout);
90     assert(f.valid());
91     assert(f.wait_for(waitTime) == std::future_status::ready);
92     assert(f.valid());
93     f.wait();
94     assert(f.valid());
95   }
96 
97   {
98     typedef int T;
99     std::promise<T> p;
100     std::shared_future<T> f = p.get_future();
101     Clock::time_point t0 = Clock::now();
102     support::make_test_thread(func1, std::move(p)).detach();
103     assert(f.valid());
104     assert(f.wait_for(ms(1)) == std::future_status::timeout);
105     assert(f.valid());
106     f.wait();
107     Clock::time_point t1 = Clock::now();
108     assert(f.valid());
109     assert(t1 - t0 >= sleepTime);
110     assert(f.wait_for(waitTime) == std::future_status::ready);
111     assert(f.valid());
112   }
113   {
114     typedef int& T;
115     std::promise<T> p;
116     std::shared_future<T> f = p.get_future();
117     Clock::time_point t0 = Clock::now();
118     support::make_test_thread(func3, std::move(p)).detach();
119     assert(f.valid());
120     assert(f.wait_for(ms(1)) == std::future_status::timeout);
121     assert(f.valid());
122     f.wait();
123     Clock::time_point t1 = Clock::now();
124     assert(f.valid());
125     assert(t1 - t0 >= sleepTime);
126     assert(f.wait_for(waitTime) == std::future_status::ready);
127     assert(f.valid());
128   }
129   {
130     typedef void T;
131     std::promise<T> p;
132     std::shared_future<T> f = p.get_future();
133     Clock::time_point t0 = Clock::now();
134     support::make_test_thread(func5, std::move(p)).detach();
135     assert(f.valid());
136     assert(f.wait_for(ms(1)) == std::future_status::timeout);
137     assert(f.valid());
138     f.wait();
139     Clock::time_point t1 = Clock::now();
140     assert(f.valid());
141     assert(t1 - t0 >= sleepTime);
142     assert(f.wait_for(waitTime) == std::future_status::ready);
143     assert(f.valid());
144   }
145 
146   return 0;
147 }
148