waitqueue.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_WAITQUEUE_H
#define LIBMUTH_WAITQUEUE_H

#include <queue>
#include "callback_decls.h"
#include "timeval_decls.h"

class WaitQueue {
        private:
                class Waiter : public Timeval {
                        public:
                                Callback &callback;
                                Waiter(Callback&, const timeval&);
                                Timeval delay() const;
                                Timeval delay(const timeval &now) const;
                                bool iscompleted() const;
                };
                class WaiterComparator : public std::binary_function<Waiter*,
                                Waiter*, bool> {
                        public:
                                bool operator()(Waiter *a, Waiter *b) {
                                                return *a > *b; }
                };

                std::priority_queue<Waiter*, std::vector<Waiter*>,
                                WaiterComparator> waits;
        public:
                bool isempty() const;
                Timeval delay() const;
                Timeval delay(const timeval &now) const;
                void put(Callback &callback, const timeval &tv);
                Callback *get();
                Callback *get(const timeval &now);
                bool cleanup();

};

#endif

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