4a1fe09b18
This is a follow up of https://reviews.llvm.org/D151559 Where one test point is potentially falky due to a race condition.
54 lines
1.4 KiB
C++
54 lines
1.4 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: no-threads
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// UNSUPPORTED: libcpp-has-no-experimental-stop_token
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// XFAIL: availability-synchronization_library-missing
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// [[nodiscard]] bool joinable() const noexcept;
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#include <atomic>
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#include <cassert>
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#include <concepts>
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#include <thread>
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#include <type_traits>
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#include "test_macros.h"
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static_assert(noexcept(std::declval<const std::jthread&>().joinable()));
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int main(int, char**) {
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// Default constructed
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{
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const std::jthread jt;
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std::same_as<bool> decltype(auto) result = jt.joinable();
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assert(!result);
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}
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// Non-default constructed
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{
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const std::jthread jt{[] {}};
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std::same_as<bool> decltype(auto) result = jt.joinable();
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assert(result);
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}
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// Non-default constructed
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// the thread of execution has not finished
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{
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std::atomic_bool done = false;
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const std::jthread jt{[&done] { done.wait(false); }};
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std::same_as<bool> decltype(auto) result = jt.joinable();
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done = true;
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done.notify_all();
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assert(result);
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}
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return 0;
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}
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