118 lines
3.9 KiB
C
118 lines
3.9 KiB
C
/****************************************************************************
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* sched/mqueue/mq_msgfree.c
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*
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* Copyright (C) 2007, 2013, 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <queue.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <nuttx/kmalloc.h>
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#include "mqueue/mqueue.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxmq_free_msg
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*
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* Description:
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* The nxmq_free_msg function will return a message to the free pool of
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* messages if it was a pre-allocated message. If the message was
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* allocated dynamically it will be deallocated.
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*
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* Input Parameters:
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* mqmsg - message to free
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void nxmq_free_msg(FAR struct mqueue_msg_s *mqmsg)
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{
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irqstate_t flags;
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/* If this is a generally available pre-allocated message,
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* then just put it back in the free list.
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*/
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if (mqmsg->type == MQ_ALLOC_FIXED)
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{
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/* Make sure we avoid concurrent access to the free
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* list from interrupt handlers.
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*/
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flags = enter_critical_section();
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sq_addlast((FAR sq_entry_t *)mqmsg, &g_msgfree);
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leave_critical_section(flags);
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}
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/* If this is a message pre-allocated for interrupts,
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* then put it back in the correct free list.
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*/
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else if (mqmsg->type == MQ_ALLOC_IRQ)
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{
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/* Make sure we avoid concurrent access to the free
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* list from interrupt handlers.
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*/
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flags = enter_critical_section();
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sq_addlast((FAR sq_entry_t *)mqmsg, &g_msgfreeirq);
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leave_critical_section(flags);
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}
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/* Otherwise, deallocate it. Note: interrupt handlers
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* will never deallocate messages because they will not
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* received them.
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*/
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else if (mqmsg->type == MQ_ALLOC_DYN)
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{
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sched_kfree(mqmsg);
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}
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else
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{
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DEBUGPANIC();
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}
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}
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