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authorroot <root@lamia.panaceas.james.local>2015-12-19 13:13:57 +0000
committerroot <root@lamia.panaceas.james.local>2015-12-19 14:18:03 +0000
commit1a2238d1bddc823df06f67312d96ccf9de2893cc (patch)
treec58a3944d674a667f133ea5a730f5037e57d3d2e /cfe/cfe/lib/lib_queue.c
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CFE from danitool [without hostTools dir]: https://mega.nz/#!mwZyFK7a!CPT3BKC8dEw29kubtdYxhB91G9vIIismTkgzQ3iUy3k
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+/* *********************************************************************
+ * Broadcom Common Firmware Environment (CFE)
+ *
+ * Queue Management routines File: lib_queue.c
+ *
+ * Routines to manage doubly-linked queues.
+ *
+ * Author: Mitch Lichtenberg (mpl@broadcom.com)
+ *
+ *********************************************************************
+ *
+ * Copyright 2000,2001,2002,2003
+ * Broadcom Corporation. All rights reserved.
+ *
+ * This software is furnished under license and may be used and
+ * copied only in accordance with the following terms and
+ * conditions. Subject to these conditions, you may download,
+ * copy, install, use, modify and distribute modified or unmodified
+ * copies of this software in source and/or binary form. No title
+ * or ownership is transferred hereby.
+ *
+ * 1) Any source code used, modified or distributed must reproduce
+ * and retain this copyright notice and list of conditions
+ * as they appear in the source file.
+ *
+ * 2) No right is granted to use any trade name, trademark, or
+ * logo of Broadcom Corporation. The "Broadcom Corporation"
+ * name may not be used to endorse or promote products derived
+ * from this software without the prior written permission of
+ * Broadcom Corporation.
+ *
+ * 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED
+ * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+ * PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT
+ * SHALL BROADCOM BE LIABLE FOR ANY DAMAGES WHATSOEVER, AND IN
+ * PARTICULAR, BROADCOM SHALL NOT BE LIABLE FOR DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE), EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ ********************************************************************* */
+
+
+#include "lib_types.h"
+#include "lib_queue.h"
+
+
+/* *********************************************************************
+ * Q_ENQUEUE(qb,item)
+ *
+ * Add item to a queue
+ *
+ * Input Parameters:
+ * qb - queue block
+ * item - item to add
+ *
+ * Return Value:
+ * Nothing.
+ ********************************************************************* */
+
+void q_enqueue(queue_t *qb,queue_t *item)
+{
+ qb->q_prev->q_next = item;
+ item->q_next = qb;
+ item->q_prev = qb->q_prev;
+ qb->q_prev = item;
+}
+
+
+/* *********************************************************************
+ * Q_DEQUEUE(element)
+ *
+ * Remove an element from the queue
+ *
+ * Input Parameters:
+ * element - element to remove
+ *
+ * Return Value:
+ * Nothing.
+ ********************************************************************* */
+
+void q_dequeue(queue_t *item)
+{
+ item->q_prev->q_next = item->q_next;
+ item->q_next->q_prev = item->q_prev;
+}
+
+
+/* *********************************************************************
+ * Q_DEQNEXT(qb)
+ *
+ * Dequeue next element from the specified queue
+ *
+ * Input Parameters:
+ * qb - queue block
+ *
+ * Return Value:
+ * next element, or NULL
+ ********************************************************************* */
+
+queue_t *q_deqnext(queue_t *qb)
+{
+ if (qb->q_next == qb) {
+ return NULL;
+ }
+
+ qb = qb->q_next;
+
+ qb->q_prev->q_next = qb->q_next;
+ qb->q_next->q_prev = qb->q_prev;
+
+ return qb;
+}
+
+
+/* *********************************************************************
+ * Q_MAP(qb)
+ *
+ * "Map" a queue, calling the specified function for each
+ * element in the queue
+ *
+ * If the function returns nonzero, q_map will terminate.
+ *
+ * Input Parameters:
+ * qb - queue block
+ * fn - function pointer
+ * a,b - parameters for the function
+ *
+ * Return Value:
+ * return value from function, or zero if entire queue
+ * was mapped.
+ ********************************************************************* */
+
+int q_map(queue_t *qb, int (*func)(queue_t *,unsigned int,unsigned int),
+ unsigned int a,unsigned int b)
+{
+ queue_t *qe;
+ queue_t *nextq;
+ int res;
+
+ qe = qb;
+
+ qe = qb->q_next;
+
+ while (qe != qb) {
+ nextq = qe->q_next;
+ if ((res = (*func)(qe,a,b))) return res;
+ qe = nextq;
+ }
+
+ return 0;
+}
+
+
+
+
+
+/* *********************************************************************
+ * Q_COUNT(qb) *
+ * *
+ * Counts the elements on a queue (not interlocked) *
+ * *
+ * Input Parameters: *
+ * qb - queue block *
+ * *
+ * Return Value: *
+ * number of elements *
+ ********************************************************************* */
+int q_count(queue_t *qb)
+{
+ queue_t *qe;
+ int res = 0;
+
+ qe = qb;
+
+ while (qe->q_next != qb) {
+ qe = qe->q_next;
+ res++;
+ }
+
+ return res;
+}
+
+
+
+
+/* *********************************************************************
+ * Q_FIND(qb,item)
+ *
+ * Determines if a particular element is on a queue.
+ *
+ * Input Parameters:
+ * qb - queue block
+ * item - queue element
+ *
+ * Return Value:
+ * 0 - not on queue
+ * >0 - position on queue
+ ********************************************************************* */
+int q_find(queue_t *qb,queue_t *item)
+{
+ queue_t *q;
+ int res = 1;
+
+ q = qb->q_next;
+
+ while (q != item) {
+ if (q == qb) return 0;
+ q = q->q_next;
+ res++;
+ }
+
+ return res;
+}
+