mirror of
https://github.com/kingToolbox/WindTerm.git
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79 lines
1.6 KiB
C++
79 lines
1.6 KiB
C++
/*
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* Copyright 2020, WindTerm.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SPIN_H
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#define SPIN_H
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#pragma once
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#include <atomic>
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#include <thread>
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class SpinMutex {
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public:
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SpinMutex() {
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unlock();
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}
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void yield(size_t nCount) {
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if (nCount < 2) {
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} else if (nCount < 16) {
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std::this_thread::yield();
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} else if (nCount < 32) {
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std::this_thread::sleep_for(std::chrono::nanoseconds(100));
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} else {
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std::this_thread::sleep_for(std::chrono::microseconds(10));
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}
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}
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void lock() {
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for (size_t i = 0; !try_lock(); i++) {
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yield(i);
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}
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}
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void unlock() {
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flag.clear(std::memory_order_release);
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}
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bool try_lock() {
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return flag.test_and_set(std::memory_order_acquire) == false;
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}
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private:
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SpinMutex(const SpinMutex &) = delete;
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SpinMutex &operator=(const SpinMutex &) = delete;
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std::atomic_flag flag;
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};
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template <typename LockType>
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class ThreadLocker {
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public:
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ThreadLocker(LockType& m_, bool bLock_ = true) : m(m_), bLock(bLock_) {
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if (bLock) m.lock();
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}
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~ThreadLocker() {
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if (bLock) m.unlock();
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}
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private:
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LockType& m;
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bool bLock;
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};
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#endif // SPIN_H
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