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 #include "test_macros.h"
23 
24 std::condition_variable cv;
25 std::mutex mut;
26 
27 int test0 = 0;
28 int test1 = 0;
29 int test2 = 0;
30 
31 void f1()
32 {
33     std::unique_lock<std::mutex> lk(mut);
34     assert(test1 == 0);
35     while (test1 == 0)
36         cv.wait(lk);
37     assert(test1 == 1);
38     test1 = 2;
39 }
40 
41 void f2()
42 {
43     std::unique_lock<std::mutex> lk(mut);
44     assert(test2 == 0);
45     while (test2 == 0)
46         cv.wait(lk);
47     assert(test2 == 1);
48     test2 = 2;
49 }
50 
51 int main(int, char**)
52 {
53     std::thread t1(f1);
54     std::thread t2(f2);
55     std::this_thread::sleep_for(std::chrono::milliseconds(100));
56     {
57         std::unique_lock<std::mutex>lk(mut);
58         test1 = 1;
59         test2 = 1;
60     }
61     cv.notify_all();
62     {
63         std::this_thread::sleep_for(std::chrono::milliseconds(100));
64         std::unique_lock<std::mutex>lk(mut);
65     }
66     t1.join();
67     t2.join();
68     assert(test1 == 2);
69     assert(test2 == 2);
70 
71   return 0;
72 }
73