58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/**
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* Circular buffer (double linked, threadsafe)
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*
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* Used to store recent readings and buffer in case of net inconnectivity
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*
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* @author Steffen Vogel <info@steffenvogel.de>
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* @copyright Copyright (c) 2011, The volkszaehler.org project
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* @package vzlogger
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* @license http://opensource.org/licenses/gpl-license.php GNU Public License
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*/
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/*
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* This file is part of volkzaehler.org
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*
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* volkzaehler.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* volkzaehler.org 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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*
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* You should have received a copy of the GNU General Public License
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* along with volkszaehler.org. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _BUFFER_H_
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#define _BUFFER_H_
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#include <pthread.h>
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#include <sys/time.h>
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#include "meter.h"
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typedef struct {
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reading_t *tail;
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reading_t *head;
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reading_t *sent;
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int size; /* number of readings currently in the buffer */
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int keep; /* number of readings to cache for local interface */
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pthread_mutex_t mutex;
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} buffer_t;
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/* prototypes */
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void buffer_init(buffer_t *buf);
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reading_t * buffer_push(buffer_t *buf, reading_t *rd);
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void buffer_free(buffer_t *buf);
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void buffer_clean(buffer_t *buf);
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void buffer_clear(buffer_t *buf);
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char * buffer_dump(buffer_t *buf, char *dump, int len);
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#endif /* _BUFFER_H_ */
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