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78 lines
1.2 KiB
78 lines
1.2 KiB
6 years ago
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/*
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* Copyright (c) 2018-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include <mutex>
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namespace basics {
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class Basic {
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public:
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Basic() {}
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void thread1() {
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mutex_1.lock();
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mutex_2.lock();
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mutex_2.unlock();
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mutex_1.unlock();
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}
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void thread2() {
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mutex_2.lock();
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mutex_1.lock();
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mutex_1.unlock();
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mutex_2.unlock();
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}
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private:
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std::mutex mutex_1;
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std::mutex mutex_2;
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};
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class WithGuard {
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public:
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WithGuard() {}
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void thread1() {
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std::lock_guard<std::mutex> lock1(mutex_1);
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std::lock_guard<std::mutex> lock2(mutex_2);
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}
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void thread2() {
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std::lock_guard<std::mutex> lock2(mutex_2);
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std::lock_guard<std::mutex> lock1(mutex_1);
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}
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private:
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std::mutex mutex_1;
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std::mutex mutex_2;
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};
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class StdLock {
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public:
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StdLock() {}
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// no reports, std::lock magically avoids deadlocks
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void thread1() {
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std::lock<std::mutex>(mutex_1, mutex_2);
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mutex_1.unlock();
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mutex_2.unlock();
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}
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void thread2() {
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std::lock<std::mutex>(mutex_2, mutex_1);
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mutex_2.unlock();
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mutex_1.unlock();
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}
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private:
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std::mutex mutex_1;
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std::mutex mutex_2;
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};
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} // namespace basics
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