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 <thread>
20 #include <chrono>
21 #include <cassert>
22 
23 #include "make_test_thread.h"
24 #include "test_macros.h"
25 
26 int main(int, char**)
27 {
28   auto const start = std::chrono::steady_clock::now();
29 
30   std::counting_semaphore<> s(0);
31 
32   assert(!s.try_acquire_until(start + std::chrono::milliseconds(250)));
33   assert(!s.try_acquire_for(std::chrono::milliseconds(250)));
34 
35   std::thread t = support::make_test_thread([&](){
36     std::this_thread::sleep_for(std::chrono::milliseconds(250));
37     s.release();
38     std::this_thread::sleep_for(std::chrono::milliseconds(250));
39     s.release();
40   });
41 
42   assert(s.try_acquire_until(start + std::chrono::seconds(2)));
43   assert(s.try_acquire_for(std::chrono::seconds(2)));
44   t.join();
45 
46   auto const end = std::chrono::steady_clock::now();
47   assert(end - start < std::chrono::seconds(10));
48 
49   return 0;
50 }
51