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 
11 // <condition_variable>
12 
13 // class condition_variable;
14 
15 // void notify_all();
16 
17 #include <condition_variable>
18 #include <mutex>
19 #include <thread>
20 #include <cassert>
21 
22 std::condition_variable cv;
23 std::mutex mut;
24 
25 int test0 = 0;
26 int test1 = 0;
27 int test2 = 0;
28 
29 void f1()
30 {
31     std::unique_lock<std::mutex> lk(mut);
32     assert(test1 == 0);
33     while (test1 == 0)
34         cv.wait(lk);
35     assert(test1 == 1);
36     test1 = 2;
37 }
38 
39 void f2()
40 {
41     std::unique_lock<std::mutex> lk(mut);
42     assert(test2 == 0);
43     while (test2 == 0)
44         cv.wait(lk);
45     assert(test2 == 1);
46     test2 = 2;
47 }
48 
49 int main(int, char**)
50 {
51     std::thread t1(f1);
52     std::thread t2(f2);
53     std::this_thread::sleep_for(std::chrono::milliseconds(100));
54     {
55         std::unique_lock<std::mutex>lk(mut);
56         test1 = 1;
57         test2 = 1;
58     }
59     cv.notify_all();
60     {
61         std::this_thread::sleep_for(std::chrono::milliseconds(100));
62         std::unique_lock<std::mutex>lk(mut);
63     }
64     t1.join();
65     t2.join();
66     assert(test1 == 2);
67     assert(test2 == 2);
68 
69   return 0;
70 }
71