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d1236680 | 1 | // { dg-do run } |
1e42d2f4 | 2 | // { dg-additional-options "-pthread" { target pthread } } |
71c54f8e | 3 | // { dg-require-effective-target c++11 } |
5d020aa2 | 4 | // { dg-require-gthreads "" } |
28c2f60e | 5 | // { dg-require-sched-yield "" } |
5d020aa2 | 6 | |
a945c346 | 7 | // Copyright (C) 2011-2024 Free Software Foundation, Inc. |
5d020aa2 JW |
8 | // |
9 | // This file is part of the GNU ISO C++ Library. This library is free | |
10 | // software; you can redistribute it and/or modify it under the | |
11 | // terms of the GNU General Public License as published by the | |
12 | // Free Software Foundation; either version 3, or (at your option) | |
13 | // any later version. | |
14 | ||
15 | // This library is distributed in the hope that it will be useful, | |
16 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | // GNU General Public License for more details. | |
19 | ||
20 | // You should have received a copy of the GNU General Public License along | |
21 | // with this library; see the file COPYING3. If not see | |
22 | // <http://www.gnu.org/licenses/>. | |
23 | ||
24 | #include <condition_variable> | |
25 | #include <thread> | |
26 | #include <mutex> | |
27 | #include <array> | |
28 | #include <sstream> | |
29 | ||
30 | struct scoped_thread | |
31 | { | |
32 | ~scoped_thread() { if (t.joinable()) t.join(); } | |
33 | std::thread t; | |
34 | }; | |
35 | ||
36 | int main() | |
37 | { | |
38 | typedef std::unique_lock<std::mutex> Lock; | |
39 | ||
40 | std::mutex m; | |
41 | std::condition_variable_any cond; | |
e8a25ac8 PC |
42 | unsigned int product = 0; |
43 | const unsigned int count = 10; | |
5d020aa2 JW |
44 | |
45 | // writing to stream causes timing changes which makes deadlock easier | |
46 | // to reproduce - do not remove | |
47 | std::ostringstream out; | |
48 | ||
49 | // create consumers | |
50 | std::array<scoped_thread, 2> threads; | |
e8a25ac8 PC |
51 | for (std::size_t i = 0; i < threads.size(); ++i) |
52 | threads[i].t | |
53 | = std::thread( [&] | |
54 | { | |
55 | for (unsigned int i = 0; i < count; ++i) | |
56 | { | |
57 | std::this_thread::yield(); | |
58 | Lock lock(m); | |
59 | while(product == 0) | |
60 | cond.wait(lock); | |
61 | out << "got product " | |
62 | << std::this_thread::get_id() | |
63 | << ' ' << product << std::endl; | |
64 | --product; | |
65 | } | |
66 | } ); | |
5d020aa2 JW |
67 | |
68 | // single producer | |
e8a25ac8 PC |
69 | for (std::size_t i = 0; i < threads.size() * count; ++i) |
70 | { | |
71 | std::this_thread::yield(); | |
72 | Lock lock(m); | |
73 | ++product; | |
74 | out << "setting product " << std::this_thread::get_id() | |
75 | << ' ' << product << std::endl; | |
76 | cond.notify_one(); | |
77 | } | |
5d020aa2 | 78 | } |