| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /** |
| * @file |
| * Declares ignite::common::ThreadPool class. |
| */ |
| |
| #ifndef _IGNITE_COMMON_THREAD_POOL |
| #define _IGNITE_COMMON_THREAD_POOL |
| |
| #include <deque> |
| #include <vector> |
| |
| #include <ignite/ignite_error.h> |
| |
| #include <ignite/common/common.h> |
| #include <ignite/common/concurrent.h> |
| |
| namespace ignite |
| { |
| namespace common |
| { |
| /** |
| * Thread pool task. |
| */ |
| class ThreadPoolTask |
| { |
| public: |
| /** |
| * Destructor. |
| */ |
| virtual ~ThreadPoolTask() |
| { |
| // No-op. |
| } |
| |
| /** |
| * Execute task. |
| */ |
| virtual void Execute() = 0; |
| |
| /** |
| * Called if error occurred during task processing. |
| * |
| * @param err Error. |
| */ |
| virtual void OnError(const IgniteError& err) = 0; |
| }; |
| |
| /** Shared pointer to thread pool task. */ |
| typedef concurrent::SharedPointer< ThreadPoolTask > SP_ThreadPoolTask; |
| |
| /** |
| * Thread Pool. |
| */ |
| class ThreadPool |
| { |
| public: |
| /** |
| * Constructor. |
| * |
| * @param threadsNum Number of threads. If set to 0 current number of processors is used. |
| */ |
| IGNITE_IMPORT_EXPORT explicit ThreadPool(uint32_t threadsNum); |
| |
| /** |
| * Destructor. |
| */ |
| IGNITE_IMPORT_EXPORT virtual ~ThreadPool(); |
| |
| /** |
| * Start threads in pool. |
| */ |
| IGNITE_IMPORT_EXPORT void Start(); |
| |
| /** |
| * Stop threads in pool. |
| * |
| * @warning Once stopped it can not be restarted. |
| */ |
| IGNITE_IMPORT_EXPORT void Stop(); |
| |
| /** |
| * Dispatch task. |
| * |
| * @param task Task. |
| */ |
| IGNITE_IMPORT_EXPORT void Dispatch(const SP_ThreadPoolTask& task); |
| |
| private: |
| IGNITE_NO_COPY_ASSIGNMENT(ThreadPool); |
| |
| /** |
| * Task queue. |
| */ |
| class TaskQueue |
| { |
| public: |
| /** |
| * Constructor. |
| */ |
| TaskQueue(); |
| |
| /** |
| * Destructor. |
| */ |
| ~TaskQueue(); |
| |
| /** |
| * Push a new task to the queue. |
| * |
| * @param task Task. Should not be null. |
| */ |
| void Push(const SP_ThreadPoolTask& task); |
| |
| /** |
| * Pop a task from the queue. |
| * |
| * @return New task or null when unblocked. |
| */ |
| SP_ThreadPoolTask Pop(); |
| |
| /** |
| * Unblock queue. When unblocked queue will not block or return new tasks. |
| */ |
| void Unblock(); |
| |
| private: |
| /** If true queue will not block. */ |
| volatile bool unblocked; |
| |
| /** Tasks queue. */ |
| std::deque< SP_ThreadPoolTask > tasks; |
| |
| /** Critical section. */ |
| concurrent::CriticalSection mutex; |
| |
| /** Condition variable. */ |
| concurrent::ConditionVariable waitPoint; |
| }; |
| |
| /** |
| * Worker thread. |
| */ |
| class WorkerThread : public concurrent::Thread |
| { |
| public: |
| /** |
| * Constructor. |
| * |
| * @param taskQueue Task queue. |
| */ |
| explicit WorkerThread(TaskQueue& taskQueue); |
| |
| /** |
| * Destructor. |
| */ |
| ~WorkerThread(); |
| |
| private: |
| /** |
| * Run thread. |
| */ |
| virtual void Run(); |
| |
| /** Task queue. */ |
| TaskQueue& taskQueue; |
| }; |
| |
| /** |
| * Handle an error that occurred during task execution. |
| * |
| * @param task Task. |
| * @param err Error. |
| */ |
| static void HandleTaskError(ThreadPoolTask &task, const IgniteError &err); |
| |
| /** Shared pointer to thread pool worker thread. */ |
| typedef concurrent::SharedPointer< WorkerThread > SP_WorkerThread; |
| |
| /** Started flag. */ |
| bool started; |
| |
| /** Stopped flag. */ |
| bool stopped; |
| |
| /** Task queue. */ |
| TaskQueue queue; |
| |
| /** Worker Threads. */ |
| std::vector<SP_WorkerThread> threads; |
| |
| /** Critical section. */ |
| concurrent::CriticalSection mutex; |
| }; |
| } |
| } |
| |
| #endif //_IGNITE_COMMON_THREAD_POOL |