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83ffe9cd | 1 | // Copyright (C) 2017-2023 Free Software Foundation, Inc. |
83fd5e73 JW |
2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
18 | // { dg-do run } | |
1e42d2f4 | 19 | // { dg-additional-options "-pthread" { target pthread } } |
83fd5e73 | 20 | // { dg-require-effective-target c++11 } |
83fd5e73 JW |
21 | // { dg-require-gthreads "" } |
22 | ||
23 | #include <condition_variable> | |
24 | #include <testsuite_hooks.h> | |
25 | ||
26 | // PR libstdc++/68519 | |
27 | ||
83fd5e73 | 28 | void |
e05ff300 | 29 | test_wait_for() |
83fd5e73 | 30 | { |
e05ff300 MC |
31 | std::mutex mx; |
32 | std::condition_variable cv; | |
33 | ||
83fd5e73 JW |
34 | for (int i = 0; i < 3; ++i) |
35 | { | |
36 | std::unique_lock<std::mutex> l(mx); | |
37 | auto start = std::chrono::system_clock::now(); | |
e05ff300 | 38 | cv.wait_for(l, std::chrono::duration<float>(1), [] { return false; }); |
83fd5e73 JW |
39 | auto t = std::chrono::system_clock::now(); |
40 | VERIFY( (t - start) >= std::chrono::seconds(1) ); | |
41 | } | |
42 | } | |
43 | ||
e05ff300 MC |
44 | // In order to ensure that the delta calculated in the arbitrary clock overload |
45 | // of condition_variable::wait_until fits accurately in a float, but the result | |
46 | // of adding it to steady_clock with a float duration does not, this clock | |
47 | // needs to use a more recent epoch. | |
48 | struct recent_epoch_float_clock | |
49 | { | |
0a74a0e1 JW |
50 | using duration = std::chrono::duration<float>; |
51 | using rep = duration::rep; | |
52 | using period = duration::period; | |
53 | using time_point | |
54 | = std::chrono::time_point<recent_epoch_float_clock, duration>; | |
e05ff300 MC |
55 | static constexpr bool is_steady = true; |
56 | ||
57 | static const std::chrono::steady_clock::time_point epoch; | |
58 | ||
59 | static time_point now() | |
60 | { | |
61 | const auto steady = std::chrono::steady_clock::now(); | |
62 | return time_point{steady - epoch}; | |
63 | } | |
64 | }; | |
65 | ||
66 | const std::chrono::steady_clock::time_point recent_epoch_float_clock::epoch = | |
67 | std::chrono::steady_clock::now(); | |
68 | ||
69 | void | |
70 | test_wait_until() | |
71 | { | |
72 | using clock = recent_epoch_float_clock; | |
73 | ||
74 | std::mutex mx; | |
75 | std::condition_variable cv; | |
76 | ||
77 | for (int i = 0; i < 3; ++i) | |
78 | { | |
79 | std::unique_lock<std::mutex> l(mx); | |
80 | const auto start = clock::now(); | |
81 | const auto wait_time = start + std::chrono::duration<float>{1.0}; | |
82 | ||
83 | // In theory we could get a spurious wakeup, but in practice we won't. | |
84 | const auto result = cv.wait_until(l, wait_time); | |
85 | ||
86 | VERIFY( result == std::cv_status::timeout ); | |
87 | const auto elapsed = clock::now() - start; | |
88 | VERIFY( elapsed >= std::chrono::seconds(1) ); | |
89 | } | |
90 | } | |
91 | ||
83fd5e73 JW |
92 | int |
93 | main() | |
94 | { | |
e05ff300 MC |
95 | test_wait_for(); |
96 | test_wait_until(); | |
83fd5e73 | 97 | } |