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 // ~condition_variable();
16 
17 #include <condition_variable>
18 #include <mutex>
19 #include <thread>
20 #include <cassert>
21 
22 std::condition_variable* cv;
23 std::mutex m;
24 typedef std::unique_lock<std::mutex> Lock;
25 
26 bool f_ready = false;
27 bool g_ready = false;
28 
29 void f()
30 {
31     Lock lk(m);
32     f_ready = true;
33     cv->notify_one();
34     delete cv;
35 }
36 
37 void g()
38 {
39     Lock lk(m);
40     g_ready = true;
41     cv->notify_one();
42     while (!f_ready)
43         cv->wait(lk);
44 }
45 
46 int main(int, char**)
47 {
48     cv = new std::condition_variable;
49     std::thread th2(g);
50     Lock lk(m);
51     while (!g_ready)
52         cv->wait(lk);
53     lk.unlock();
54     std::thread th1(f);
55     th1.join();
56     th2.join();
57 
58   return 0;
59 }
60