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/*****************************************************************************
* buffer.c: buffer management
*****************************************************************************
* Copyright (C) 2011 M2X BV
*
* Authors: Jean-Paul Saman <jpsaman@videolan.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************/
#include "config.h"
#include <stdlib.h>
#include <stdbool.h>
#include <pthread.h>
#if defined(HAVE_INTTYPES_H)
# include <inttypes.h>
#elif defined(HAVE_STDINT_H)
# include <stdint.h>
#endif
#include <sys/types.h>
#include <assert.h>
typedef int64_t mtime_t;
#include "buffer.h"
struct fifo_s
{
pthread_mutex_t lock;
pthread_cond_t wait;
bool b_force_wake;
ssize_t i_count;
size_t i_size; /* fifo size in bytes */
buffer_t *p_first;
buffer_t **pp_last;
};
/* */
buffer_t *buffer_new(size_t i_size)
{
buffer_t *buffer = (buffer_t*)malloc(sizeof(buffer_t) + i_size);
if (buffer == NULL) return NULL;
buffer->i_size = i_size;
buffer->i_date = 0;
buffer->p_next = NULL;
buffer->p_data = (uint8_t*)((uint8_t *)buffer + sizeof(buffer_t));
return buffer;
}
void buffer_free(buffer_t *buffer)
{
free(buffer);
buffer = NULL;
}
/* Fifo */
fifo_t *fifo_new(void)
{
fifo_t *fifo = (fifo_t *) malloc(sizeof(fifo_t));
if (fifo == NULL) return NULL;
fifo->i_count = 0;
fifo->i_size = 0;
fifo->b_force_wake = false;
fifo->p_first = NULL;
fifo->pp_last = &fifo->p_first;
pthread_mutex_init(&fifo->lock, NULL);
pthread_cond_init(&fifo->wait, NULL);
return fifo;
}
void fifo_free(fifo_t *fifo)
{
if (fifo == NULL)
return;
pthread_mutex_lock(&fifo->lock);
buffer_t *p = fifo->p_first;
if (p != NULL)
{
fifo->i_count = 0;
fifo->p_first = NULL;
fifo->pp_last = &fifo->p_first;
}
pthread_mutex_unlock(&fifo->lock);
while (p != NULL)
{
buffer_t *buffer;
buffer = p->p_next;
buffer_free(p);
p = buffer;
}
pthread_cond_destroy(&fifo->wait);
pthread_mutex_destroy(&fifo->lock);
free(fifo);
fifo = NULL;
}
void fifo_wake(fifo_t *fifo)
{
pthread_mutex_lock(&fifo->lock);
if (fifo->p_first == NULL)
fifo->b_force_wake = true;
pthread_cond_broadcast(&fifo->wait);
pthread_mutex_unlock(&fifo->lock);
}
ssize_t fifo_count(fifo_t *fifo)
{
pthread_mutex_lock(&fifo->lock);
ssize_t count = fifo->i_count;
pthread_mutex_unlock(&fifo->lock);
return count;
}
size_t fifo_size(fifo_t *fifo)
{
pthread_mutex_lock(&fifo->lock);
size_t size = fifo->i_size;
pthread_mutex_unlock(&fifo->lock);
return size;
}
void fifo_push(fifo_t *fifo, buffer_t *buffer)
{
buffer_t *p_last;
size_t i_depth = 0;
if (buffer == NULL)
return;
pthread_mutex_lock(&fifo->lock);
for (p_last = buffer; ; p_last = p_last->p_next)
{
i_depth ++;
if (!p_last->p_next)
break;
}
*fifo->pp_last = buffer;
fifo->pp_last = &p_last->p_next;
fifo->i_count += i_depth;
fifo->i_size += buffer->i_size;
assert(fifo->p_first != NULL);
assert(fifo->pp_last != NULL);
pthread_cond_signal(&fifo->wait);
pthread_mutex_unlock(&fifo->lock);
}
buffer_t *fifo_pop(fifo_t *fifo)
{
buffer_t *buffer;
pthread_mutex_lock(&fifo->lock);
while ((fifo->p_first == NULL) && !fifo->b_force_wake)
pthread_cond_wait(&fifo->wait, &fifo->lock);
buffer = fifo->p_first;
fifo->b_force_wake = false;
if (buffer == NULL)
{
pthread_mutex_unlock(&fifo->lock);
return NULL;
}
fifo->p_first = buffer->p_next;
fifo->i_count--;
fifo->i_size -= buffer->i_size;
if (fifo->p_first == NULL)
{
fifo->pp_last = &fifo->p_first;
}
pthread_mutex_unlock(&fifo->lock);
buffer->p_next = NULL;
return buffer;
}
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