epollscheduler.h

/*
 *  Copyright (C) 2006  Helmut Grohne
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef LIBMUTH_EPOLLSCHEDULER_H
#define LIBMUTH_EPOLLSCHEDULER_H

#ifndef USE_EPOLL
#error this file must be compiled with -DUSE_EPOLL
#endif

#include <map>
#include <sys/epoll.h>
#include "basescheduler_decls.h"
#include "callback_decls.h"
#include "lock.h"
#include "timeval_decls.h"
#include "waitqueue.h"

#define EPOLL_MAX_EVENTS 256

class EpollScheduler : public BaseScheduler {
        private:
                /*
                 * This lock locks all acceess to rfds, wfds and waits.
                 */
                Lock datalock;
                /*
                 * Whenever a Microthread wants to read or write from or to a
                 * filedescriptor it runs the scheduleReader or scheduleWriter
                 * method which will add the filedescriptor as key and the
                 * instance pointer as value to rfdsched or wfdsched. The pair
                 * will be discarded from the map when the filedescriptor
                 * becomes readable or writeable.
                 */
                std::map<int, Callback*> rfds, wfds;
                WaitQueue waits;

                Lock notifylock;
                bool notified;
                int rpipe, wpipe;
                void notifyme();
                int efd;
                void epoll_ctl(int op, int fd, struct epoll_event *event);
                struct epoll_event events[EPOLL_MAX_EVENTS];
        protected:
                EpollScheduler(BlockingQueue<Microthread*> *q=NULL);
        public:
                static EpollScheduler &create(
                                BlockingQueue<Microthread*> *q=NULL);
                void addReadCallback(Callback &cb, int fd);
                void addWriteCallback(Callback &cb, int fd);
                void addWaitCallback(Callback &cb, const timeval &tv);
                void run();
};

#endif

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