queue/get.c

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/**
 * \file
 *
 * \author  Georg Hopp
 *
 * \copyright
 * Copyright © 2012  Georg Hopp
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include "class.h"
#include "queue.h"

void *
queueGet(Queue this)
{
    Queue   first;
    void  * msg;

    if (NULL == this->first) {
        return NULL;
    }

    msg   = this->first->msg;
    first = this->first->next;

    if (this->first == this->last) {
        this->last = NULL;
    }
    delete(this->first);

    this->next  = first;
    this->first = first;
    this->nmsg--;

    return msg;
}

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