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/***
This file is part of PulseAudio.
Copyright 2004-2008 Lennart Poettering
PulseAudio 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.
PulseAudio 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 PulseAudio; 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 <stdlib.h>
#include <pulse/xmalloc.h>
#include <pulsecore/macro.h>
#include <pulsecore/flist.h>
#include "queue.h"
PA_STATIC_FLIST_DECLARE(entries, 0, pa_xfree);
struct queue_entry {
struct queue_entry *next;
void *data;
};
struct pa_queue {
struct queue_entry *front, *back;
unsigned length;
};
pa_queue* pa_queue_new(void) {
pa_queue *q = pa_xnew(pa_queue, 1);
q->front = q->back = NULL;
q->length = 0;
return q;
}
void pa_queue_free(pa_queue* q, pa_free2_cb_t free_func, void *userdata) {
void *data;
pa_assert(q);
while ((data = pa_queue_pop(q)))
if (free_func)
free_func(data, userdata);
pa_assert(!q->front);
pa_assert(!q->back);
pa_assert(q->length == 0);
pa_xfree(q);
}
void pa_queue_push(pa_queue *q, void *p) {
struct queue_entry *e;
pa_assert(q);
pa_assert(p);
if (!(e = pa_flist_pop(PA_STATIC_FLIST_GET(entries))))
e = pa_xnew(struct queue_entry, 1);
e->data = p;
e->next = NULL;
if (q->back) {
pa_assert(q->front);
q->back->next = e;
} else {
pa_assert(!q->front);
q->front = e;
}
q->back = e;
q->length++;
}
void* pa_queue_pop(pa_queue *q) {
void *p;
struct queue_entry *e;
pa_assert(q);
if (!(e = q->front))
return NULL;
q->front = e->next;
if (q->back == e) {
pa_assert(!e->next);
q->back = NULL;
}
p = e->data;
if (pa_flist_push(PA_STATIC_FLIST_GET(entries), e) < 0)
pa_xfree(e);
q->length--;
return p;
}
int pa_queue_isempty(pa_queue *q) {
pa_assert(q);
return q->length == 0;
}
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