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121ed5c198
<stop_token> is not experimental anymore, so its tests shouldn't be guarded by libcpp-has-no-experimental-stop_token.
89 lines
2.7 KiB
C++
89 lines
2.7 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: c++03, c++11, c++14, c++17
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// XFAIL: availability-synchronization_library-missing
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// void join();
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#include <atomic>
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#include <cassert>
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#include <chrono>
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#include <concepts>
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#include <functional>
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#include <system_error>
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#include <thread>
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#include <type_traits>
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#include <vector>
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#include "make_test_thread.h"
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#include "test_macros.h"
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int main(int, char**) {
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// Effects: Blocks until the thread represented by *this has completed.
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{
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std::atomic_int calledTimes = 0;
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std::vector<std::jthread> jts;
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constexpr auto numberOfThreads = 10u;
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jts.reserve(numberOfThreads);
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for (auto i = 0u; i < numberOfThreads; ++i) {
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jts.emplace_back(support::make_test_jthread([&] {
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std::this_thread::sleep_for(std::chrono::milliseconds(2));
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calledTimes.fetch_add(1, std::memory_order_relaxed);
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}));
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}
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for (auto i = 0u; i < numberOfThreads; ++i) {
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jts[i].join();
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}
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// If join did block, calledTimes must equal to numberOfThreads
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// If join did not block, there is a chance that the check below happened
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// before test threads incrementing the counter, thus calledTimed would
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// be less than numberOfThreads.
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// This is not going to catch issues 100%. Creating more threads to increase
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// the probability of catching the issue
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assert(calledTimes.load(std::memory_order_relaxed) == numberOfThreads);
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}
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// Synchronization: The completion of the thread represented by *this synchronizes with
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// ([intro.multithread]) the corresponding successful join() return.
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{
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bool flag = false;
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std::jthread jt = support::make_test_jthread([&] { flag = true; });
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jt.join();
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assert(flag); // non atomic write is visible to the current thread
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}
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// Postconditions: The thread represented by *this has completed. get_id() == id().
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{
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std::jthread jt = support::make_test_jthread([] {});
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assert(jt.get_id() != std::jthread::id());
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jt.join();
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assert(jt.get_id() == std::jthread::id());
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}
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#if !defined(TEST_HAS_NO_EXCEPTIONS)
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// Throws: system_error when an exception is required ([thread.req.exception]).
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// invalid_argument - if the thread is not joinable.
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{
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std::jthread jt;
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try {
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jt.join();
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assert(false);
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} catch (const std::system_error& err) {
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assert(err.code() == std::errc::invalid_argument);
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}
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}
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#endif
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return 0;
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}
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