/************************************************************
* mq_msgfree.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 Gregory Nutt 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 <sys/types.h> /* uint32, etc. */
#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
************************************************************/
/************************************************************
* Function: 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(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((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((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);
}
}
