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author | Gregory Nutt <gnutt@nuttx.org> | 2014-06-06 09:35:31 -0600 |
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committer | Gregory Nutt <gnutt@nuttx.org> | 2014-06-06 09:35:31 -0600 |
commit | 34c0b633c6530b8e7fce5479a5d0d41cd10b10cb (patch) | |
tree | 7ca3bf869409dd7665b31d5f7ff18fe42863c77b /nuttx/net/iob/iob_remove_queue.c | |
parent | c7395ffbde4fb05be4f9f7dae07d2e3bb67c3438 (diff) | |
download | nuttx-34c0b633c6530b8e7fce5479a5d0d41cd10b10cb.tar.gz nuttx-34c0b633c6530b8e7fce5479a5d0d41cd10b10cb.tar.bz2 nuttx-34c0b633c6530b8e7fce5479a5d0d41cd10b10cb.zip |
IOB: Add queue handling interfaces; improve lists
Diffstat (limited to 'nuttx/net/iob/iob_remove_queue.c')
-rw-r--r-- | nuttx/net/iob/iob_remove_queue.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/nuttx/net/iob/iob_remove_queue.c b/nuttx/net/iob/iob_remove_queue.c new file mode 100644 index 000000000..7a64d47c7 --- /dev/null +++ b/nuttx/net/iob/iob_remove_queue.c @@ -0,0 +1,94 @@ +/**************************************************************************** + * net/iob/iob_remove_queue.c + * + * Copyright (C) 2014 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY 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) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <debug.h> + +#include <nuttx/net/iob.h> + +#include "iob.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +#ifndef NULL +# define NULL ((FAR void *)0) +#endif + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: iob_add_queue + * + * Description: + * Remove one I/O buffer chain from the heaqd of a queue. + * + ****************************************************************************/ + +FAR struct iob_s *iob_remove_queue(FAR struct iob_queue_s *iobq) +{ + FAR struct iob_qentry_s *qentry; + FAR struct iob_s *iob = NULL; + + /* Remove the I/O buffer chain from the head of the queue */ + + qentry = iobq->qh_head; + if (qentry) + { + iobq->qh_head = qentry->qe_flink; + if (!iobq->qh_head) + { + iobq->qh_tail = NULL; + } + + /* Extract the I/O buffer chain from the container and free the + * container. + */ + + iob = qentry->qe_head; + iob_free_qentry(qentry); + } + + return iob; +} + |