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author | Gregory Nutt <gnutt@nuttx.org> | 2014-06-03 12:41:34 -0600 |
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committer | Gregory Nutt <gnutt@nuttx.org> | 2014-06-03 12:41:34 -0600 |
commit | 6d7446a054fdfa9bed57d003e085175a5ed89b92 (patch) | |
tree | d703850da16c7635da749542ff387681026b0e2f /nuttx/net/iob/iob_free.c | |
parent | e8f16d76fb1dc7ec47dde9558a59472223f68547 (diff) | |
download | px4-nuttx-6d7446a054fdfa9bed57d003e085175a5ed89b92.tar.gz px4-nuttx-6d7446a054fdfa9bed57d003e085175a5ed89b92.tar.bz2 px4-nuttx-6d7446a054fdfa9bed57d003e085175a5ed89b92.zip |
NET: Add generic I/O buffering logic
Diffstat (limited to 'nuttx/net/iob/iob_free.c')
-rw-r--r-- | nuttx/net/iob/iob_free.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/nuttx/net/iob/iob_free.c b/nuttx/net/iob/iob_free.c new file mode 100644 index 000000000..273f4b5a0 --- /dev/null +++ b/nuttx/net/iob/iob_free.c @@ -0,0 +1,83 @@ +/**************************************************************************** + * net/iob/iob_free.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 <queue.h> + +#include <nuttx/net/iob.h> + +#include "iob.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: iob_free + * + * Description: + * Free the I/O buffer at the head of a buffer chain returning it to the + * free list. The link to the next I/O buffer in the chain is return. + * + ****************************************************************************/ + +FAR struct iob_s *iob_free(FAR struct iob_s *iob) +{ + sq_entry_t *next = iob->io_link.flink; + + sq_addlast(&iob->io_link, &g_iob_freelist); + return (FAR struct iob_s *)next; +} |