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: no-threads
10// UNSUPPORTED: c++03, c++11
11
12// Until we drop support for the synchronization library in C++11/14/17
13// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
14
15// XFAIL: availability-synchronization_library-missing
16
17// <semaphore>
18
19#include <semaphore>
20#include <thread>
21#include <chrono>
22#include <cassert>
23
24#include "make_test_thread.h"
25#include "test_macros.h"
26
27int main(int, char**)
28{
29 auto const start = std::chrono::steady_clock::now();
30
31 std::counting_semaphore<> s(0);
32
33 assert(!s.try_acquire_until(start + std::chrono::milliseconds(250)));
34 assert(!s.try_acquire_for(std::chrono::milliseconds(250)));
35
36 std::thread t = support::make_test_thread([&](){
37 std::this_thread::sleep_for(std::chrono::milliseconds(250));
38 s.release();
39 std::this_thread::sleep_for(std::chrono::milliseconds(250));
40 s.release();
41 });
42
43 assert(s.try_acquire_until(start + std::chrono::seconds(2)));
44 assert(s.try_acquire_for(std::chrono::seconds(2)));
45 t.join();
46
47 auto const end = std::chrono::steady_clock::now();
48 assert(end - start < std::chrono::seconds(10));
49
50 return 0;
51}
52

source code of libcxx/test/std/thread/thread.semaphore/timed.pass.cpp