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author | px4dev <px4@purgatory.org> | 2013-01-14 21:01:58 -0800 |
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committer | px4dev <px4@purgatory.org> | 2013-01-14 21:01:58 -0800 |
commit | 854c6436b4e3b292fd04843795d0369dc8856783 (patch) | |
tree | 4d5602f5c70926d2dcd01294561ddd8df4378462 /nuttx/libc/queue/dq_addfirst.c | |
parent | 6d138a845aabad31060bd00da0d20d177d3f4be4 (diff) | |
parent | c38ad4ded570eddadeeca3579d02dfc63dcc8a9d (diff) | |
download | px4-firmware-854c6436b4e3b292fd04843795d0369dc8856783.tar.gz px4-firmware-854c6436b4e3b292fd04843795d0369dc8856783.tar.bz2 px4-firmware-854c6436b4e3b292fd04843795d0369dc8856783.zip |
Pull NuttX up to the 6.24 release.
Merge branch 'nuttx-merge-5447'
Diffstat (limited to 'nuttx/libc/queue/dq_addfirst.c')
-rw-r--r-- | nuttx/libc/queue/dq_addfirst.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/nuttx/libc/queue/dq_addfirst.c b/nuttx/libc/queue/dq_addfirst.c new file mode 100644 index 000000000..56767b928 --- /dev/null +++ b/nuttx/libc/queue/dq_addfirst.c @@ -0,0 +1,74 @@ +/************************************************************ + * libc/queue/dq_addfirst.c + * + * Copyright (C) 2007, 2011 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. + * + ************************************************************/ + +/************************************************************ + * Compilation Switches + ************************************************************/ + +/************************************************************ + * Included Files + ************************************************************/ + +#include <queue.h> + +/************************************************************ + * Public Functions + ************************************************************/ + +/************************************************************ + * Name: dq_addfirst + * + * Description: + * dq_addfirst affs 'node' at the beginning of 'queue' + * + ************************************************************/ + +void dq_addfirst(FAR dq_entry_t *node, dq_queue_t *queue) +{ + node->blink = NULL; + node->flink = queue->head; + + if (!queue->head) + { + queue->head = node; + queue->tail = node; + } + else + { + queue->head->blink = node; + queue->head = node; + } +} + |