mirror of https://gitee.com/bigwinds/arangodb
136 lines
4.5 KiB
C++
136 lines
4.5 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief generic thread pool
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2014 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 Jan Steemann
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/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
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/// @author Copyright 2013-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_BASICS_THREAD_POOL_H
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#define ARANGODB_BASICS_THREAD_POOL_H 1
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#include "Basics/Common.h"
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#include "Basics/ConditionLocker.h"
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#include "Basics/ConditionVariable.h"
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#include "Basics/Mutex.h"
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#include <functional>
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namespace triagens {
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namespace basics {
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class WorkerThread;
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// -----------------------------------------------------------------------------
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// --SECTION-- ThreadPool
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// -----------------------------------------------------------------------------
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class ThreadPool {
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors / destructors
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// -----------------------------------------------------------------------------
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public:
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ThreadPool (ThreadPool const&) = delete;
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ThreadPool& operator= (ThreadPool const&) = delete;
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ThreadPool (size_t,
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std::string const&);
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~ThreadPool ();
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// -----------------------------------------------------------------------------
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// --SECTION-- public functions
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// -----------------------------------------------------------------------------
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return the number of threads in the pool
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////////////////////////////////////////////////////////////////////////////////
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size_t numThreads () const {
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return _threads.size();
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return the name of the pool
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////////////////////////////////////////////////////////////////////////////////
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char const* name () const {
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return _name.c_str();
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief dequeue a task
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////////////////////////////////////////////////////////////////////////////////
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bool dequeue (std::function<void()>&);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief enqueue a task
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////////////////////////////////////////////////////////////////////////////////
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template<typename T>
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void enqueue (T task) {
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{
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CONDITION_LOCKER(guard, _condition);
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_tasks.emplace_back(std::function<void()>(task));
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}
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_condition.signal();
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- private variables
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// -----------------------------------------------------------------------------
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private:
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triagens::basics::ConditionVariable _condition;
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std::vector<triagens::basics::WorkerThread*> _threads;
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std::deque<std::function<void()>> _tasks;
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std::string _name;
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std::atomic<bool> _stopping;
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};
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} // namespace triagens::basics
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} // namespace triagens
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#endif
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// -----------------------------------------------------------------------------
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// --SECTION-- END-OF-FILE
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// -----------------------------------------------------------------------------
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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