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475e154331
This patch introduces the support::make_test_jthread utility which is basically the same as support::make_test_thread but for std::jthread. It allows vendors to maintain a downstream way to create threads for use within the test suite, which is especially useful for embedded platforms.
71 lines
2.2 KiB
C++
71 lines
2.2 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: 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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// ~jthread();
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#include <atomic>
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#include <cassert>
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#include <optional>
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#include <stop_token>
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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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// !joinable()
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{
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std::jthread jt;
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assert(!jt.joinable());
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}
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// If joinable() is true, calls request_stop() and then join().
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// request_stop is called
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{
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std::optional<std::jthread> jt = support::make_test_jthread([] {});
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bool called = false;
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std::stop_callback cb(jt->get_stop_token(), [&called] { called = true; });
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jt.reset();
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assert(called);
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}
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// If joinable() is true, calls request_stop() and then join().
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// join is called
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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([&calledTimes] {
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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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jts.clear();
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// If join was called as expected, calledTimes must equal to numberOfThreads
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// If join was not called, 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 would 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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return 0;
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}
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