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112 lines
2.6 KiB
C++
112 lines
2.6 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#ifndef FILEBLOCKREQUESTQUEUE_H
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#define FILEBLOCKREQUESTQUEUE_H
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/***************************************************************************
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*
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* $Id: fileblockrequestqueue.h 483 2008-02-10 20:23:28Z rdempsey $
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*
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* jrodriguez@calpont.com *
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* *
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***************************************************************************/
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#include <deque>
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#include <pthread.h>
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#include <iostream>
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#include "filerequest.h"
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/**
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@author Jason Rodriguez <jrodriguez@calpont.com>
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*/
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/**
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* @brief definition of the block request queue as stl std::priority_queue
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**/
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namespace dbbc {
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typedef std::deque<fileRequest*> fileBlockRequestQueue_t;
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/**
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* @brief class to hold requests for disk blocks in a queue. sorted by the size of a request
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**/
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class fileBlockRequestQueue {
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public:
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/**
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* @brief default ctor
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**/
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fileBlockRequestQueue();
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/**
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* @brief dtor
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**/
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virtual ~fileBlockRequestQueue();
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/**
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* @brief add a request to the queue
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**/
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int push(fileRequest& blk);
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/**
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* @brief get the next request from the queue and delete it from the queue
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**/
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fileRequest* pop(void);
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/**
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* @brief true if no reuquests are in the queue. false if there are requests in the queue
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**/
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bool empty() const;
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/**
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* @brief number of requests in the queue
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**/
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uint32_t size() const {return queueSize;}
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/**
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* @brief queue will stop accecpting requests in preparation for the dtor
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**/
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void stop();
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protected:
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pthread_mutex_t mutex;
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pthread_cond_t notEmpty;
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fileBlockRequestQueue_t fbQueue;
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uint32_t queueSize;
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uint32_t readersWaiting;
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private:
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// do not implement
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fileBlockRequestQueue(const fileBlockRequestQueue& Q){}
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const fileBlockRequestQueue& operator=(const fileBlockRequestQueue& Q);
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/**
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* @brief pointer to the next request to be popped from the queue
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**/
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fileRequest* top() const;
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};
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}
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#endif
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