141 lines
4.2 KiB
C
141 lines
4.2 KiB
C
/****************************************************************************
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* sched/mqueue/mq_desclose.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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* Input Parameters:
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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: nxmq_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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* Input 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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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned on
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* and failure.
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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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int nxmq_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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#ifdef CONFIG_DEBUG_FEATURES
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mqd_t mq_ptr;
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#endif
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DEBUGASSERT(mqdes != NULL && group != NULL);
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#ifdef CONFIG_DEBUG_FEATURES
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/* Check that msgq is valid for closing. It must be owned by the current
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* group. NOTE the call to sq_rem() below would corrupt the descriptor
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* list if mqdes did not lie in the list.
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*/
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mq_ptr = (mqd_t)sq_peek(&group->tg_msgdesq);
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while (mq_ptr)
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{
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if (mq_ptr == mqdes)
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{
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break;
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}
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mq_ptr = (mqd_t)sq_next(mq_ptr);
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}
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DEBUGASSERT(mq_ptr != NULL);
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if (mq_ptr == NULL)
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{
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/* 'mqdes' does not lie in the group's list of message descriptors. */
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return -EPERM;
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}
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#endif
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/* Remove the message descriptor from the current group'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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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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nxsig_cancel_notification(&msgq->ntwork);
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}
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/* Deallocate the message descriptor */
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mq_desfree(mqdes);
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return OK;
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}
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