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 <cassert>
19 #include <semaphore>
20 #include <thread>
21 
22 #include "make_test_thread.h"
23 #include "test_macros.h"
24 
25 int main(int, char**)
26 {
27   std::counting_semaphore<> s(1);
28 
29   assert(s.try_acquire());
30   s.release();
31   assert(s.try_acquire());
32   s.release(2);
33   std::thread t = support::make_test_thread([&](){
34     assert(s.try_acquire());
35   });
36   t.join();
37   assert(s.try_acquire());
38 
39   return 0;
40 }
41