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 // UNSUPPORTED: c++98, c++03, c++11
11 
12 // <semaphore>
13 
14 #include <semaphore>
15 #include <chrono>
16 #include <thread>
17 
18 #include "test_macros.h"
19 
20 int main(int, char**)
21 {
22   std::binary_semaphore s(1);
23 
24   auto l = [&](){
25     for(int i = 0; i < 1024; ++i) {
26         s.acquire();
27         std::this_thread::sleep_for(std::chrono::microseconds(1));
28         s.release();
29     }
30   };
31 
32   std::thread t(l);
33   l();
34 
35   t.join();
36 
37   return 0;
38 }
39