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/* $Id$ */
/***
This file is part of polypaudio.
polypaudio 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 2 of the License,
or (at your option) any later version.
polypaudio 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 polypaudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <stdlib.h>
#include "queue.h"
#include "xmalloc.h"
struct queue_entry {
struct queue_entry *next;
void *data;
};
struct pa_queue {
struct queue_entry *front, *back;
unsigned length;
};
struct pa_queue* pa_queue_new(void) {
struct pa_queue *q = pa_xmalloc(sizeof(struct pa_queue));
q->front = q->back = NULL;
q->length = 0;
return q;
}
void pa_queue_free(struct pa_queue* q, void (*destroy)(void *p, void *userdata), void *userdata) {
struct queue_entry *e;
assert(q);
e = q->front;
while (e) {
struct queue_entry *n = e->next;
if (destroy)
destroy(e->data, userdata);
pa_xfree(e);
e = n;
}
pa_xfree(q);
}
void pa_queue_push(struct pa_queue *q, void *p) {
struct queue_entry *e;
e = pa_xmalloc(sizeof(struct queue_entry));
e->data = p;
e->next = NULL;
if (q->back)
q->back->next = e;
else {
assert(!q->front);
q->front = e;
}
q->back = e;
q->length++;
}
void* pa_queue_pop(struct pa_queue *q) {
void *p;
struct queue_entry *e;
assert(q);
if (!(e = q->front))
return NULL;
q->front = e->next;
if (q->back == e)
q->back = NULL;
p = e->data;
pa_xfree(e);
q->length--;
return p;
}
int pa_queue_is_empty(struct pa_queue *q) {
assert(q);
return q->length == 0;
}
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