-/* Copyright (C) 2008 Board of Trustees, Leland Stanford Jr. University.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
+/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
+ * Junior University
+ *
+ * We are making the OpenFlow specification and associated documentation
+ * (Software) available for public use and benefit with the expectation
+ * that others will use, modify and enhance the Software and contribute
+ * those enhancements back to the community. However, since we would
+ * like to make the Software available for broadest use, with as few
+ * restrictions as possible permission is hereby granted, free of
+ * charge, to any person obtaining a copy of this Software to deal in
+ * the Software under the copyrights without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * The name and trademarks of copyright holder(s) may NOT be used in
+ * advertising or publicity pertaining to the Software or any
+ * derivatives without specific, written prior permission.
*/
+#include <config.h>
#include "queue.h"
#include <assert.h>
-#include "buffer.h"
+#include "ofpbuf.h"
-static void check_queue(struct queue *q);
+static void check_queue(struct ofp_queue *q);
+/* Initializes 'q' as an empty packet queue. */
void
-queue_init(struct queue *q)
+queue_init(struct ofp_queue *q)
{
q->n = 0;
q->head = NULL;
q->tail = NULL;
}
+/* Destroys 'q' and all of the packets that it contains. */
void
-queue_destroy(struct queue *q)
+queue_destroy(struct ofp_queue *q)
{
- struct buffer *cur, *next;
+ struct ofpbuf *cur, *next;
for (cur = q->head; cur != NULL; cur = next) {
next = cur->next;
- buffer_delete(cur);
+ ofpbuf_delete(cur);
}
}
+/* Removes and destroys all of the packets in 'q', rendering it empty. */
void
-queue_clear(struct queue *q)
+queue_clear(struct ofp_queue *q)
{
queue_destroy(q);
queue_init(q);
}
+/* Advances the first packet in 'q' from 'q->head' to 'next', which should be
+ * the second packet in the queue.
+ *
+ * The odd, unsafe interface here allows the first packet in the queue to be
+ * passed to a function for possible consumption (and destruction) and only
+ * dropped from the queue if that function actually accepts it. */
void
-queue_advance_head(struct queue *q, struct buffer *next)
+queue_advance_head(struct ofp_queue *q, struct ofpbuf *next)
{
assert(q->n);
assert(q->head);
q->n--;
}
+/* Appends 'b' to the tail of 'q'. */
void
-queue_push_tail(struct queue *q, struct buffer *b)
+queue_push_tail(struct ofp_queue *q, struct ofpbuf *b)
{
check_queue(q);
check_queue(q);
}
+/* Removes the first buffer from 'q', which must not be empty, and returns
+ * it. The caller must free the buffer (with ofpbuf_delete()) when it is no
+ * longer needed. */
+struct ofpbuf *
+queue_pop_head(struct ofp_queue *q)
+{
+ struct ofpbuf *head = q->head;
+ queue_advance_head(q, head->next);
+ return head;
+}
+
+/* Checks the internal integrity of 'q'. For use in debugging. */
static void
-check_queue(struct queue *q)
+check_queue(struct ofp_queue *q)
{
#if 0
- struct buffer *iter;
+ struct ofpbuf *iter;
size_t n;
assert(q->n == 0
git://git.onelab.eu / sliver-openvswitch.git / blobdiff