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- /****************************************************************************
- * sched/mqueue/mq_desclose.c
- *
- * Copyright (C) 2007, 2009, 2013-2017 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 <mqueue.h>
- #include <sched.h>
- #include <string.h>
- #include <assert.h>
- #include <queue.h>
- #include <nuttx/sched.h>
- #include <nuttx/mqueue.h>
- #include "mqueue/mqueue.h"
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: mq_desfree
- *
- * Description:
- * Deallocate a message queue descriptor but returning it to the free list
- *
- * Input Parameters:
- * mqdes - message queue descriptor to free
- *
- ****************************************************************************/
- #define mq_desfree(mqdes) sq_addlast((FAR sq_entry_t*)mqdes, &g_desfree)
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: nxmq_desclose_group
- *
- * Description:
- * This function performs the portion of the mq_close operation related
- * to freeing resource used by the message queue descriptor itself.
- *
- * Input Parameters:
- * mqdes - Message queue descriptor.
- * group - Group that has the open descriptor.
- *
- * Returned Value:
- * Zero (OK) is returned on success; a negated errno value is returned on
- * and failure.
- *
- * Assumptions:
- * - Called only from mq_close() with the scheduler locked.
- *
- ****************************************************************************/
- int nxmq_desclose_group(mqd_t mqdes, FAR struct task_group_s *group)
- {
- FAR struct mqueue_inode_s *msgq;
- #ifdef CONFIG_DEBUG_FEATURES
- mqd_t mq_ptr;
- #endif
- DEBUGASSERT(mqdes != NULL && group != NULL);
- #ifdef CONFIG_DEBUG_FEATURES
- /* Check that msgq is valid for closing. It must be owned by the current
- * group. NOTE the call to sq_rem() below would corrupt the descriptor
- * list if mqdes did not lie in the list.
- */
- mq_ptr = (mqd_t)sq_peek(&group->tg_msgdesq);
- while (mq_ptr)
- {
- if (mq_ptr == mqdes)
- {
- break;
- }
- mq_ptr = (mqd_t)sq_next(mq_ptr);
- }
- DEBUGASSERT(mq_ptr != NULL);
- if (mq_ptr == NULL)
- {
- /* 'mqdes' does not lie in the group's list of message descriptors. */
- return -EPERM;
- }
- #endif
- /* Remove the message descriptor from the current group's list of message
- * descriptors.
- */
- sq_rem((FAR sq_entry_t *)mqdes, &group->tg_msgdesq);
- /* Find the message queue associated with the message descriptor */
- msgq = mqdes->msgq;
- /* Check if the calling task has a notification attached to the message
- * queue via this mqdes.
- */
- if (msgq->ntmqdes == mqdes)
- {
- memset(&msgq->ntevent, 0, sizeof(struct sigevent));
- msgq->ntpid = INVALID_PROCESS_ID;
- msgq->ntmqdes = NULL;
- nxsig_cancel_notification(&msgq->ntwork);
- }
- /* Deallocate the message descriptor */
- mq_desfree(mqdes);
- return OK;
- }
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