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author | px4dev <px4@purgatory.org> | 2012-08-04 15:12:36 -0700 |
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committer | px4dev <px4@purgatory.org> | 2012-08-04 15:12:36 -0700 |
commit | 8a365179eafdf3aea98e60ab9f5882b200d4c759 (patch) | |
tree | 4f38d6d4cd80bd0b6e22e2bb534c3f117ce44e56 /nuttx/sched/mq_msgfree.c | |
download | px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.tar.gz px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.tar.bz2 px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.zip |
Fresh import of the PX4 firmware sources.
Diffstat (limited to 'nuttx/sched/mq_msgfree.c')
-rw-r--r-- | nuttx/sched/mq_msgfree.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/nuttx/sched/mq_msgfree.c b/nuttx/sched/mq_msgfree.c new file mode 100644 index 000000000..91322fbf3 --- /dev/null +++ b/nuttx/sched/mq_msgfree.c @@ -0,0 +1,134 @@ +/************************************************************************ + * sched/mq_msgfree.c + * + * Copyright (C) 2007 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/arch.h> +#include "os_internal.h" +#include "mq_internal.h" + +/************************************************************************ + * Definitions + ************************************************************************/ + +/************************************************************************ + * Private Type Declarations + ************************************************************************/ + +/************************************************************************ + * Global Variables + ************************************************************************/ + +/************************************************************************ + * Private Variables + ************************************************************************/ + +/************************************************************************ + * Private Functions + ************************************************************************/ + +/************************************************************************ + * Public Functions + ************************************************************************/ + +/************************************************************************ + * Name: mq_msgfree + * + * Description: + * The mq_msgfree function will return a message to the free pool of + * messages if it was a pre-allocated message. If the message was + * allocated dynamically it will be deallocated. + * + * Inputs: + * mqmsg - message to free + * + * Return Value: + * None + * + ************************************************************************/ + +void mq_msgfree(FAR mqmsg_t *mqmsg) +{ + irqstate_t saved_state; + + /* If this is a generally available pre-allocated message, + * then just put it back in the free list. + */ + + if (mqmsg->type == MQ_ALLOC_FIXED) + { + /* Make sure we avoid concurrent access to the free + * list from interrupt handlers. + */ + + saved_state = irqsave(); + sq_addlast((FAR sq_entry_t*)mqmsg, &g_msgfree); + irqrestore(saved_state); + } + + /* If this is a message pre-allocated for interrupts, + * then put it back in the correct free list. + */ + + else if (mqmsg->type == MQ_ALLOC_IRQ) + { + /* Make sure we avoid concurrent access to the free + * list from interrupt handlers. + */ + + saved_state = irqsave(); + sq_addlast((FAR sq_entry_t*)mqmsg, &g_msgfreeirq); + irqrestore(saved_state); + } + + /* Otherwise, deallocate it. Note: interrupt handlers + * will never deallocate messages because they will not + * received them. + */ + + else if (mqmsg->type == MQ_ALLOC_DYN) + { + sched_free(mqmsg); + } + else + { + PANIC(OSERR_BADMSGTYPE); + } +} |