c9af0e61fa
Neither the current C++2b draft, nor any revision of [p1135], nor libstdc++, claims that `counting_semaphore` should be default-constructible. I think this was just a copy-paste issue somehow. Also, `explicit` was missing from the constructor. Also, `constexpr` remains missing; but that's probably more of a technical limitation, since apparently there are some platforms where we don't (can't??) use the atomic implementation and have to rely on pthreads, which obviously isn't constexpr. Differential Revision: https://reviews.llvm.org/D110042
47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// UNSUPPORTED: libcpp-has-no-threads
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// UNSUPPORTED: c++03, c++11
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// This test requires the dylib support introduced in D68480, which shipped in
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// macOS 11.0.
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// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
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// <semaphore>
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#include <semaphore>
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#include <chrono>
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#include <thread>
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#include <type_traits>
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#include "make_test_thread.h"
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#include "test_macros.h"
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static_assert(std::is_same<std::binary_semaphore, std::counting_semaphore<1>>::value, "");
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int main(int, char**)
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{
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std::binary_semaphore s(1);
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auto l = [&](){
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for(int i = 0; i < 1024; ++i) {
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s.acquire();
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std::this_thread::sleep_for(std::chrono::microseconds(1));
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s.release();
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}
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};
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std::thread t = support::make_test_thread(l);
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l();
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t.join();
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return 0;
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}
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