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