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 // TODO(ldionne): This test fails on Ubuntu Focal on our CI nodes (and only there), in 32 bit mode.
12 // UNSUPPORTED: linux && 32bits-on-64bits
13 
14 // <condition_variable>
15 
16 // class condition_variable;
17 
18 // void notify_all();
19 
20 #include <condition_variable>
21 #include <mutex>
22 #include <thread>
23 #include <cassert>
24 
25 #include "make_test_thread.h"
26 #include "test_macros.h"
27 
28 std::condition_variable cv;
29 std::mutex mut;
30 
31 int test0 = 0;
32 int test1 = 0;
33 int test2 = 0;
34 
35 void f1()
36 {
37     std::unique_lock<std::mutex> lk(mut);
38     assert(test1 == 0);
39     while (test1 == 0)
40         cv.wait(lk);
41     assert(test1 == 1);
42     test1 = 2;
43 }
44 
45 void f2()
46 {
47     std::unique_lock<std::mutex> lk(mut);
48     assert(test2 == 0);
49     while (test2 == 0)
50         cv.wait(lk);
51     assert(test2 == 1);
52     test2 = 2;
53 }
54 
55 int main(int, char**)
56 {
57     std::thread t1 = support::make_test_thread(f1);
58     std::thread t2 = support::make_test_thread(f2);
59     std::this_thread::sleep_for(std::chrono::milliseconds(100));
60     {
61         std::unique_lock<std::mutex>lk(mut);
62         test1 = 1;
63         test2 = 1;
64     }
65     cv.notify_all();
66     {
67         std::this_thread::sleep_for(std::chrono::milliseconds(100));
68         std::unique_lock<std::mutex>lk(mut);
69     }
70     t1.join();
71     t2.join();
72     assert(test1 == 2);
73     assert(test2 == 2);
74 
75   return 0;
76 }
77