mirror of https://gitee.com/bigwinds/arangodb
104 lines
2.6 KiB
C++
104 lines
2.6 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2016 ArangoDB 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 Dr. Frank Celler
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_SCHEDULER_JOB_GUARD_H
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#define ARANGOD_SCHEDULER_JOB_GUARD_H 1
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#include "Basics/Common.h"
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#include "Basics/SameThreadAsserter.h"
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#include "Scheduler/EventLoop.h"
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#include "Scheduler/Scheduler.h"
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namespace arangodb {
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namespace rest {
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class Scheduler;
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}
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class JobGuard : public SameThreadAsserter {
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public:
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JobGuard(JobGuard const&) = delete;
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JobGuard& operator=(JobGuard const&) = delete;
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explicit JobGuard(EventLoop const& loop) : SameThreadAsserter(), _scheduler(loop.scheduler) {}
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explicit JobGuard(rest::Scheduler* scheduler) : SameThreadAsserter(), _scheduler(scheduler) {}
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~JobGuard() { release(); }
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public:
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void work() {
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TRI_ASSERT(!_isWorkingFlag);
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if (0 == _isWorking++) {
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_scheduler->workThread();
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}
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_isWorkingFlag = true;
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}
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void block() {
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TRI_ASSERT(!_isBlockedFlag);
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if (0 == _isBlocked++) {
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_scheduler->blockThread();
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}
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_isBlockedFlag = true;
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}
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private:
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void release() {
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if (_isWorkingFlag) {
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_isWorkingFlag = false;
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TRI_ASSERT(_isWorking > 0);
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if (0 == --_isWorking) {
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// if this is the last JobGuard we inform the
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// scheduler that the thread is back to idle
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_scheduler->unworkThread();
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}
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}
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if (_isBlockedFlag) {
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_isBlockedFlag = false;
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TRI_ASSERT(_isBlocked > 0);
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if (0 == --_isBlocked) {
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// if this is the last JobGuard we inform the
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// scheduler that the thread is now unblocked
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_scheduler->unblockThread();
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}
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}
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}
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private:
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rest::Scheduler* _scheduler;
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bool _isWorkingFlag = false;
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bool _isBlockedFlag = false;
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static thread_local size_t _isWorking;
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static thread_local size_t _isBlocked;
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};
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}
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#endif
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