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author | root <root@lamia.panaceas.james.local> | 2015-12-19 13:13:57 +0000 |
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committer | root <root@lamia.panaceas.james.local> | 2015-12-19 14:18:03 +0000 |
commit | 1a2238d1bddc823df06f67312d96ccf9de2893cc (patch) | |
tree | c58a3944d674a667f133ea5a730f5037e57d3d2e /cfe/cfe/lib/lib_queue.c | |
download | bootloader-1a2238d1bddc823df06f67312d96ccf9de2893cc.tar.gz bootloader-1a2238d1bddc823df06f67312d96ccf9de2893cc.tar.bz2 bootloader-1a2238d1bddc823df06f67312d96ccf9de2893cc.zip |
CFE from danitool [without hostTools dir]: https://mega.nz/#!mwZyFK7a!CPT3BKC8dEw29kubtdYxhB91G9vIIismTkgzQ3iUy3k
Diffstat (limited to 'cfe/cfe/lib/lib_queue.c')
-rw-r--r-- | cfe/cfe/lib/lib_queue.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/cfe/cfe/lib/lib_queue.c b/cfe/cfe/lib/lib_queue.c new file mode 100644 index 0000000..0712adf --- /dev/null +++ b/cfe/cfe/lib/lib_queue.c @@ -0,0 +1,219 @@ +/* ********************************************************************* + * 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; +} + |