126 lines
4.2 KiB
C
126 lines
4.2 KiB
C
/****************************************************************************
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* sched/mqueue/mq_desclose.c
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*
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* Copyright (C) 2007, 2009, 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 <mqueue.h>
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#include <sched.h>
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#include <string.h>
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#include <assert.h>
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#include <queue.h>
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#include <nuttx/sched.h>
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#include <nuttx/mqueue.h>
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#include "mqueue/mqueue.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mq_desfree
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*
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* Description:
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* Deallocate a message queue descriptor but returning it to the free list
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*
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* Inputs:
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* mqdes - message queue descriptor to free
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*
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****************************************************************************/
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#define mq_desfree(mqdes) sq_addlast((FAR sq_entry_t*)mqdes, &g_desfree)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mq_desclose_group
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*
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* Description:
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* This function performs the portion of the mq_close operation related
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* to freeing resource used by the message queue descriptor itself.
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*
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* Parameters:
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* mqdes - Message queue descriptor.
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* group - Group that has the open descriptor.
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*
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* Return Value:
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* None.
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*
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* Assumptions:
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* - Called only from mq_close() with the scheduler locked.
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*
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****************************************************************************/
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void mq_desclose_group(mqd_t mqdes, FAR struct task_group_s *group)
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{
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FAR struct mqueue_inode_s *msgq;
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DEBUGASSERT(mqdes != NULL && group != NULL);
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/* Remove the message descriptor from the current task's list of message
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* descriptors.
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*/
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sq_rem((FAR sq_entry_t *)mqdes, &group->tg_msgdesq);
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/* Find the message queue associated with the message descriptor */
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msgq = mqdes->msgq;
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/* Check if the calling task has a notification attached to the message
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* queue via this mqdes.
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*/
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#ifndef CONFIG_DISABLE_SIGNALS
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if (msgq->ntmqdes == mqdes)
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{
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memset(&msgq->ntevent, 0, sizeof(struct sigevent));
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msgq->ntpid = INVALID_PROCESS_ID;
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msgq->ntmqdes = NULL;
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}
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#endif
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/* Deallocate the message descriptor */
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mq_desfree(mqdes);
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}
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