cavis/libnd4j/include/execution/ThreadPool.h

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/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://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.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
//
// @author raver119@gmail.com
//
#ifndef SAMEDIFF_THREADPOOL_H
#define SAMEDIFF_THREADPOOL_H
#include <list>
#include <vector>
#include <thread>
#include <atomic>
#include <mutex>
#include <execution/BlockingQueue.h>
#include <execution/CallableWithArguments.h>
#include <execution/CallableInterface.h>
#include <execution/Ticket.h>
#include <queue>
namespace samediff {
class ND4J_EXPORT ThreadPool {
private:
std::vector<std::thread> _threads;
std::vector<BlockingQueue<CallableWithArguments*>*> _queues;
std::vector<CallableInterface*> _interfaces;
std::mutex _lock;
std::atomic<int> _available;
std::queue<Ticket*> _tickets;
protected:
ThreadPool();
~ThreadPool();
public:
static ThreadPool& getInstance();
/**
* This method returns list of pointers to threads ONLY if num_threads of threads were available upon request, returning empty list otherwise
* @param num_threads
* @return
*/
Ticket* tryAcquire(int num_threads);
/**
* This method marks specified number of threads as released, and available for use
* @param num_threads
*/
void release(int num_threads = 1);
void release(Ticket *ticket);
};
}
#endif //DEV_TESTS_THREADPOOL_H