2e43a304f1
| | old time | new time | | ------------------ | -------- | -------- | | functional - c++23 | 416ms | 225ms | | random - c++23 | 513ms | 392ms | | vector - c++17 | 206ms | 100ms |
105 lines
2.3 KiB
C++
105 lines
2.3 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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// UNSUPPORTED: no-threads
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// UNSUPPORTED: c++03, c++11
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// <shared_mutex>
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// template <class Mutex> class shared_lock;
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// explicit shared_lock(mutex_type& m);
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// template<class _Mutex> shared_lock(shared_lock<_Mutex>)
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// -> shared_lock<_Mutex>; // C++17
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#include <atomic>
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#include <cassert>
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#include <shared_mutex>
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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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struct Monitor {
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bool lock_shared_called = false;
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bool unlock_shared_called = false;
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};
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struct TrackedMutex {
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Monitor* monitor = nullptr;
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void lock_shared() {
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if (monitor != nullptr)
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monitor->lock_shared_called = true;
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}
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void unlock_shared() {
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if (monitor != nullptr)
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monitor->unlock_shared_called = true;
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}
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};
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template <class Mutex>
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void test() {
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// Basic sanity test
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{
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Mutex mutex;
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std::vector<std::thread> threads;
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std::atomic<bool> ready(false);
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for (int i = 0; i != 5; ++i) {
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threads.push_back(support::make_test_thread([&] {
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while (!ready) {
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// spin
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}
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std::shared_lock<Mutex> lock(mutex);
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assert(lock.owns_lock());
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}));
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}
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ready = true;
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for (auto& t : threads)
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t.join();
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}
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// Test CTAD
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{
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#if TEST_STD_VER >= 17
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Mutex mutex;
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std::shared_lock lock(mutex);
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static_assert(std::is_same<decltype(lock), std::shared_lock<Mutex>>::value);
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#endif
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}
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}
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int main(int, char**) {
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#if TEST_STD_VER >= 17
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test<std::shared_mutex>();
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#endif
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test<std::shared_timed_mutex>();
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test<TrackedMutex>();
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// Use shared_lock with a dummy mutex class that tracks whether each
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// operation has been called or not.
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{
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Monitor monitor;
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TrackedMutex mutex{&monitor};
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std::shared_lock<TrackedMutex> lock(mutex);
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assert(monitor.lock_shared_called);
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assert(lock.owns_lock());
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lock.unlock();
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assert(monitor.unlock_shared_called);
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}
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return 0;
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}
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