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, c++14, c++17
11
12// XFAIL: availability-synchronization_library-missing
13
14// <semaphore>
15
16#include <semaphore>
17#include <thread>
18#include <chrono>
19#include <cassert>
20
21#include "make_test_thread.h"
22#include "test_macros.h"
23
24int main(int, char**)
25{
26 auto const start = std::chrono::steady_clock::now();
27
28 std::counting_semaphore<> s(0);
29
30 assert(!s.try_acquire_until(start + std::chrono::milliseconds(250)));
31 assert(!s.try_acquire_for(std::chrono::milliseconds(250)));
32
33 std::thread t = support::make_test_thread([&](){
34 std::this_thread::sleep_for(std::chrono::milliseconds(250));
35 s.release();
36 std::this_thread::sleep_for(std::chrono::milliseconds(250));
37 s.release();
38 });
39
40 assert(s.try_acquire_until(start + std::chrono::seconds(2)));
41 assert(s.try_acquire_for(std::chrono::seconds(2)));
42 t.join();
43
44 auto const end = std::chrono::steady_clock::now();
45 assert(end - start < std::chrono::seconds(10));
46
47 return 0;
48}
49

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