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117 lines
3.1 KiB
C++
117 lines
3.1 KiB
C++
/**
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Lightweight profiler library for c++
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Copyright(C) 2016 Sergey Yagovtsev, Victor Zarubkin
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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GNU General Public License Usage
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Alternatively, this file may be used under the terms of the GNU
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General Public License as published by the Free Software Foundation,
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either version 3 of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program.If not, see <http://www.gnu.org/licenses/>.
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**/
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#ifndef EASY_PROFILER__SPIN_LOCK__________H______
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#define EASY_PROFILER__SPIN_LOCK__________H______
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#define EASY_USE_CRITICAL_SECTION // Use CRITICAL_SECTION instead of std::atomic_flag
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#if defined(_WIN32) && defined(EASY_USE_CRITICAL_SECTION)
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#include <Windows.h>
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#else
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#include <atomic>
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#endif
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namespace profiler {
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#if defined(_WIN32) && defined(EASY_USE_CRITICAL_SECTION)
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// std::atomic_flag on Windows works slower than critical section, so we will use it instead of std::atomic_flag...
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// By the way, Windows critical sections are slower than std::atomic_flag on Unix.
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class spin_lock { CRITICAL_SECTION m_lock; public:
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void lock() {
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EnterCriticalSection(&m_lock);
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}
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void unlock() {
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LeaveCriticalSection(&m_lock);
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}
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spin_lock() {
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InitializeCriticalSection(&m_lock);
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}
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~spin_lock() {
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DeleteCriticalSection(&m_lock);
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}
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};
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#else
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// std::atomic_flag on Unix works fine and very fast (almost instant!)
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class spin_lock { ::std::atomic_flag m_lock; public:
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void lock() {
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while (m_lock.test_and_set(::std::memory_order_acquire));
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}
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void unlock() {
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m_lock.clear(::std::memory_order_release);
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}
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spin_lock() {
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m_lock.clear();
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}
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};
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#endif
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template <class T>
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class guard_lock
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{
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T& m_lock;
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bool m_isLocked = false;
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public:
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explicit guard_lock(T& m) : m_lock(m) {
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m_lock.lock();
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m_isLocked = true;
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}
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~guard_lock() {
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unlock();
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}
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inline void unlock() {
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if (m_isLocked) {
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m_lock.unlock();
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m_isLocked = false;
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}
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}
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};
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} // END of namespace profiler.
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#ifdef EASY_USE_CRITICAL_SECTION
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# undef EASY_USE_CRITICAL_SECTION
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#endif
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#endif // EASY_PROFILER__SPIN_LOCK__________H______
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