queue.h

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/*
 *  Copyright (C) 2023 Swansea University
 *
 *  This file is part of the SELKIELogger suite of tools.
 *
 *  SELKIELogger 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.
 *
 *  SELKIELogger 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 SELKIELogger product.
 *  If not, see <http://www.gnu.org/licenses/>.
*/
 
#ifndef SELKIELoggerBase_Queue
#define SELKIELoggerBase_Queue
 
#include <pthread.h>
#include <stdbool.h>
 
#include "messages.h"
 
typedef struct queueitem queueitem;
 
typedef struct msgqueue {
    queueitem *head;      
    queueitem *tail;      
    pthread_mutex_t lock; 
    bool valid;           
} msgqueue;
 
struct queueitem {
    msg_t *item;     
    queueitem *next; 
};
 
bool queue_init(msgqueue *queue);
 
void queue_destroy(msgqueue *queue);
 
bool queue_push(msgqueue *queue, msg_t *item);
 
bool queue_push_qi(msgqueue *queue, queueitem *item);
 
msg_t *queue_pop(msgqueue *queue);
 
int queue_count(const msgqueue *queue);
#endif