111 строки
2.1 KiB
C
111 строки
2.1 KiB
C
/* $Id: dqueue.c,v 1.5 2003/04/12 21:40:49 schindler Exp $
|
|
*
|
|
* Driver for Eicon DIVA Server ISDN cards.
|
|
* User Mode IDI Interface
|
|
*
|
|
* Copyright 2000-2003 by Armin Schindler (mac@melware.de)
|
|
* Copyright 2000-2003 Cytronics & Melware (info@melware.de)
|
|
*
|
|
* This software may be used and distributed according to the terms
|
|
* of the GNU General Public License, incorporated herein by reference.
|
|
*/
|
|
|
|
#include "platform.h"
|
|
#include "dqueue.h"
|
|
|
|
int
|
|
diva_data_q_init(diva_um_idi_data_queue_t * q,
|
|
int max_length, int max_segments)
|
|
{
|
|
int i;
|
|
|
|
q->max_length = max_length;
|
|
q->segments = max_segments;
|
|
|
|
for (i = 0; i < q->segments; i++) {
|
|
q->data[i] = NULL;
|
|
q->length[i] = 0;
|
|
}
|
|
q->read = q->write = q->count = q->segment_pending = 0;
|
|
|
|
for (i = 0; i < q->segments; i++) {
|
|
if (!(q->data[i] = diva_os_malloc(0, q->max_length))) {
|
|
diva_data_q_finit(q);
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int diva_data_q_finit(diva_um_idi_data_queue_t * q)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < q->segments; i++) {
|
|
if (q->data[i]) {
|
|
diva_os_free(0, q->data[i]);
|
|
}
|
|
q->data[i] = NULL;
|
|
q->length[i] = 0;
|
|
}
|
|
q->read = q->write = q->count = q->segment_pending = 0;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int diva_data_q_get_max_length(const diva_um_idi_data_queue_t * q)
|
|
{
|
|
return (q->max_length);
|
|
}
|
|
|
|
void *diva_data_q_get_segment4write(diva_um_idi_data_queue_t * q)
|
|
{
|
|
if ((!q->segment_pending) && (q->count < q->segments)) {
|
|
q->segment_pending = 1;
|
|
return (q->data[q->write]);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
diva_data_q_ack_segment4write(diva_um_idi_data_queue_t * q, int length)
|
|
{
|
|
if (q->segment_pending) {
|
|
q->length[q->write] = length;
|
|
q->count++;
|
|
q->write++;
|
|
if (q->write >= q->segments) {
|
|
q->write = 0;
|
|
}
|
|
q->segment_pending = 0;
|
|
}
|
|
}
|
|
|
|
const void *diva_data_q_get_segment4read(const diva_um_idi_data_queue_t *
|
|
q)
|
|
{
|
|
if (q->count) {
|
|
return (q->data[q->read]);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int diva_data_q_get_segment_length(const diva_um_idi_data_queue_t * q)
|
|
{
|
|
return (q->length[q->read]);
|
|
}
|
|
|
|
void diva_data_q_ack_segment4read(diva_um_idi_data_queue_t * q)
|
|
{
|
|
if (q->count) {
|
|
q->length[q->read] = 0;
|
|
q->count--;
|
|
q->read++;
|
|
if (q->read >= q->segments) {
|
|
q->read = 0;
|
|
}
|
|
}
|
|
}
|