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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* GQueue: Double ended queue implementation, piggy backed on GList.
* Copyright (C) 1998 Tim Janik
*
* 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 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* MT safe
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "glib.h"
G_LOCK_DEFINE_STATIC (queue_memchunk);
static GMemChunk *queue_memchunk = NULL;
static GTrashStack *free_queue_nodes = NULL;
GQueue*
g_queue_new (void)
{
GQueue *queue;
G_LOCK (queue_memchunk);
queue = g_trash_stack_pop (&free_queue_nodes);
if (!queue)
{
if (!queue_memchunk)
queue_memchunk = g_mem_chunk_new ("GLib GQueue chunk",
sizeof (GNode),
sizeof (GNode) * 128,
G_ALLOC_ONLY);
queue = g_chunk_new (GQueue, queue_memchunk);
}
G_UNLOCK (queue_memchunk);
queue->head = NULL;
queue->tail = NULL;
queue->length = 0;
return queue;
}
void
g_queue_free (GQueue *queue)
{
g_return_if_fail (queue != NULL);
g_list_free (queue->head);
#ifdef ENABLE_GC_FRIENDLY
queue->head = NULL;
queue->tail = NULL;
#endif /* ENABLE_GC_FRIENDLY */
G_LOCK (queue_memchunk);
g_trash_stack_push (&free_queue_nodes, queue);
G_UNLOCK (queue_memchunk);
}
void
g_queue_push_head (GQueue *queue,
gpointer data)
{
g_return_if_fail (queue != NULL);
queue->head = g_list_prepend (queue->head, data);
if (!queue->tail)
queue->tail = queue->head;
queue->length++;
}
void
g_queue_push_head_link (GQueue *queue,
GList *link)
{
g_return_if_fail (queue != NULL);
g_return_if_fail (link != NULL);
g_return_if_fail (link->prev == NULL);
g_return_if_fail (link->next == NULL);
link->next = queue->head;
if (queue->head)
queue->head->prev = link;
else
queue->tail = link;
queue->head = link;
queue->length++;
}
void
g_queue_push_tail (GQueue *queue,
gpointer data)
{
g_return_if_fail (queue != NULL);
queue->tail = g_list_append (queue->tail, data);
if (queue->tail->next)
queue->tail = queue->tail->next;
else
queue->head = queue->tail;
queue->length++;
}
void
g_queue_push_tail_link (GQueue *queue,
GList *link)
{
g_return_if_fail (queue != NULL);
g_return_if_fail (link != NULL);
g_return_if_fail (link->prev == NULL);
g_return_if_fail (link->next == NULL);
link->prev = queue->tail;
if (queue->tail)
queue->tail->next = link;
else
queue->head = link;
queue->tail = link;
queue->length++;
}
gpointer
g_queue_pop_head (GQueue *queue)
{
g_return_val_if_fail (queue != NULL, NULL);
if (queue->head)
{
GList *node = queue->head;
gpointer data = node->data;
queue->head = node->next;
if (queue->head)
queue->head->prev = NULL;
else
queue->tail = NULL;
g_list_free_1 (node);
queue->length--;
return data;
}
return NULL;
}
GList*
g_queue_pop_head_link (GQueue *queue)
{
g_return_val_if_fail (queue != NULL, NULL);
if (queue->head)
{
GList *node = queue->head;
queue->head = node->next;
if (queue->head)
{
queue->head->prev = NULL;
node->next = NULL;
}
else
queue->tail = NULL;
queue->length--;
return node;
}
return NULL;
}
gpointer
g_queue_pop_tail (GQueue *queue)
{
g_return_val_if_fail (queue != NULL, NULL);
if (queue->tail)
{
GList *node = queue->tail;
gpointer data = node->data;
queue->tail = node->prev;
if (queue->tail)
queue->tail->next = NULL;
else
queue->head = NULL;
queue->length--;
g_list_free_1 (node);
return data;
}
return NULL;
}
GList*
g_queue_pop_tail_link (GQueue *queue)
{
g_return_val_if_fail (queue != NULL, NULL);
if (queue->tail)
{
GList *node = queue->tail;
queue->tail = node->prev;
if (queue->tail)
{
queue->tail->next = NULL;
node->prev = NULL;
}
else
queue->head = NULL;
queue->length--;
return node;
}
return NULL;
}
gboolean
g_queue_is_empty (GQueue *queue)
{
g_return_val_if_fail (queue != NULL, TRUE);
return queue->head == NULL;
}
gpointer
g_queue_peek_head (GQueue *queue)
{
g_return_val_if_fail (queue != NULL, NULL);
return queue->head ? queue->head->data : NULL;
}
gpointer
g_queue_peek_tail (GQueue *queue)
{
g_return_val_if_fail (queue != NULL, NULL);
return queue->tail ? queue->tail->data : NULL;
}
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