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++03, c++11
11 
12 // This test requires the dylib support introduced in D68480, which shipped in
13 // macOS 11.0.
14 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
15 
16 // <semaphore>
17 
18 #include <semaphore>
19 #include <chrono>
20 #include <thread>
21 #include <type_traits>
22 
23 #include "make_test_thread.h"
24 #include "test_macros.h"
25 
26 static_assert(std::is_same<std::binary_semaphore, std::counting_semaphore<1>>::value, "");
27 
28 int main(int, char**)
29 {
30   std::binary_semaphore s(1);
31 
32   auto l = [&](){
33     for(int i = 0; i < 1024; ++i) {
34         s.acquire();
35         std::this_thread::sleep_for(std::chrono::microseconds(1));
36         s.release();
37     }
38   };
39 
40   std::thread t = support::make_test_thread(l);
41   l();
42 
43   t.join();
44 
45   return 0;
46 }
47