mirror of https://gitee.com/bigwinds/arangodb
56 lines
1.7 KiB
C++
56 lines
1.7 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2017 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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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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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Daniel H. Larkin
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGO_CPU_RELAX_H
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#define ARANGO_CPU_RELAX_H 1
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#include "Basics/Common.h"
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#include "Basics/operating-system.h"
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#include <thread>
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namespace arangodb {
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namespace basics {
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////////////////////////////////////////////////////////////////////////////////
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/// @brief Function to let CPU relax inside spinlock.
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////////////////////////////////////////////////////////////////////////////////
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inline void cpu_relax() {
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// TODO use <boost/fiber/detail/cpu_relax.hpp> when available (>1.65.0?)
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#if defined(__i386) || defined(_M_IX86) || defined(__x86_64__) || defined(_M_X64)
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#if defined _WIN32
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YieldProcessor();
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#else
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asm volatile("pause" ::: "memory");
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#endif
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#else
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static constexpr std::chrono::microseconds us0{0};
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std::this_thread::sleep_for(us0);
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#endif
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}
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} // namespace basics
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} // namespace arangodb
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#endif
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