2012-07-14 21:30:31 +02:00
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/****************************************************************************
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2014-09-29 23:48:52 +02:00
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* fs/mqueue/mq_close.c
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2007-02-18 00:21:28 +01:00
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*
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2014-09-29 23:48:52 +02:00
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* Copyright (C) 2007, 2009, 2013-2014 Gregory Nutt. All rights reserved.
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2012-07-14 21:30:31 +02:00
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* Author: Gregory Nutt <gnutt@nuttx.org>
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2007-02-18 00:21:28 +01:00
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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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2009-12-14 20:30:18 +01:00
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* 3. Neither the name NuttX nor the names of its contributors may be
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2007-02-18 00:21:28 +01:00
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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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2012-07-14 21:30:31 +02:00
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****************************************************************************/
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2007-02-18 00:21:28 +01:00
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2012-07-14 21:30:31 +02:00
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/****************************************************************************
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2007-02-18 00:21:28 +01:00
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* Included Files
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2012-07-14 21:30:31 +02:00
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****************************************************************************/
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2007-02-18 00:21:28 +01:00
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2009-12-14 19:39:29 +01:00
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#include <nuttx/config.h>
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2007-02-18 00:21:28 +01:00
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#include <sched.h>
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2014-09-29 23:33:34 +02:00
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#include <mqueue.h>
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2013-02-04 17:55:38 +01:00
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#include <assert.h>
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2012-07-14 21:30:31 +02:00
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2014-09-29 23:33:34 +02:00
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#include <nuttx/kmalloc.h>
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#include <nuttx/sched.h>
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#include <nuttx/mqueue.h>
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#include "inode/inode.h"
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2014-08-08 20:31:23 +02:00
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#include "mqueue/mqueue.h"
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2007-02-18 00:21:28 +01:00
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2012-07-14 21:30:31 +02:00
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/****************************************************************************
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2014-09-29 22:09:31 +02:00
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* Pre-processor Definitions
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2012-07-14 21:30:31 +02:00
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****************************************************************************/
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2007-02-18 00:21:28 +01:00
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2012-07-14 21:30:31 +02:00
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/****************************************************************************
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2007-02-18 00:21:28 +01:00
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* Private Type Declarations
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2012-07-14 21:30:31 +02:00
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****************************************************************************/
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2007-02-18 00:21:28 +01:00
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2012-07-14 21:30:31 +02:00
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/****************************************************************************
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2014-09-29 22:09:31 +02:00
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* Public Variables
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2012-07-14 21:30:31 +02:00
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****************************************************************************/
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2007-02-18 00:21:28 +01:00
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2012-07-14 21:30:31 +02:00
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/****************************************************************************
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2007-02-18 00:21:28 +01:00
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* Private Variables
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2012-07-14 21:30:31 +02:00
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****************************************************************************/
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2007-02-18 00:21:28 +01:00
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2012-07-14 21:30:31 +02:00
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/****************************************************************************
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2007-02-18 00:21:28 +01:00
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* Private Functions
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2012-07-14 21:30:31 +02:00
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****************************************************************************/
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2007-02-18 00:21:28 +01:00
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2012-07-14 21:30:31 +02:00
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/****************************************************************************
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2007-02-18 00:21:28 +01:00
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* Public Functions
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2012-07-14 21:30:31 +02:00
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****************************************************************************/
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2007-02-18 00:21:28 +01:00
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2012-07-14 21:30:31 +02:00
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/****************************************************************************
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* Name: mq_close
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2007-02-18 00:21:28 +01:00
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*
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* Description:
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2012-07-14 21:30:31 +02:00
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* This function is used to indicate that the calling task is finished
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* with the specified message queued mqdes. The mq_close() deallocates
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* any system resources allocated by the system for use by this task for
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* its message queue.
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2007-02-18 00:21:28 +01:00
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*
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2012-07-14 21:30:31 +02:00
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* If the calling task has attached a notification to the message queue
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* via this mqdes, this attachment will be removed and the message queue
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* is available for another process to attach a notification.
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2007-02-18 00:21:28 +01:00
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*
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* Parameters:
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* mqdes - Message queue descriptor.
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*
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* Return Value:
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* 0 (OK) if the message queue is closed successfully,
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* otherwise, -1 (ERROR).
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*
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* Assumptions:
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2012-07-14 21:30:31 +02:00
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* - The behavior of a task that is blocked on either a mq_send() or
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* mq_receive() is undefined when mq_close() is called.
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* - The results of using this message queue descriptor after a successful
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* return from mq_close() is undefined.
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2007-02-18 00:21:28 +01:00
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*
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2012-07-14 21:30:31 +02:00
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****************************************************************************/
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2007-02-18 00:21:28 +01:00
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int mq_close(mqd_t mqdes)
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{
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2014-09-29 23:33:34 +02:00
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FAR struct tcb_s *rtcb = sched_self();
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2013-02-04 17:55:38 +01:00
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FAR struct task_group_s *group = rtcb->group;
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2014-09-29 21:19:11 +02:00
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FAR struct mqueue_inode_s *msgq;
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2014-09-29 23:48:52 +02:00
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FAR struct inode *inode;
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2013-02-04 17:55:38 +01:00
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DEBUGASSERT(group);
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2007-02-18 00:21:28 +01:00
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/* Verify the inputs */
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if (mqdes)
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{
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sched_lock();
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/* Remove the message descriptor from the current task's
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* list of message descriptors.
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*/
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2013-02-04 17:55:38 +01:00
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sq_rem((FAR sq_entry_t*)mqdes, &group->tg_msgdesq);
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2007-02-18 00:21:28 +01:00
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/* Find the message queue associated with the message descriptor */
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msgq = mqdes->msgq;
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2014-09-29 23:33:34 +02:00
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DEBUGASSERT(msgq && msgq->inode);
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2007-02-18 00:21:28 +01:00
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/* Check if the calling task has a notification attached to
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* the message queue via this mqdes.
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*/
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2007-03-01 00:45:56 +01:00
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#ifndef CONFIG_DISABLE_SIGNALS
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2007-02-18 00:21:28 +01:00
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if (msgq->ntmqdes == mqdes)
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{
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msgq->ntpid = INVALID_PROCESS_ID;
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msgq->ntsigno = 0;
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msgq->ntvalue.sival_int = 0;
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msgq->ntmqdes = NULL;
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}
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2007-03-01 00:45:56 +01:00
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#endif
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2007-02-18 00:21:28 +01:00
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2014-09-29 23:48:52 +02:00
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/* Get the inode from the message queue structure */
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inode = msgq->inode;
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DEBUGASSERT(inode->u.i_mqueue == msgq);
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2014-09-29 23:33:34 +02:00
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/* Decrement the reference count on the inode */
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2007-02-18 00:21:28 +01:00
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2014-09-29 23:48:52 +02:00
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mq_release(inode);
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}
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2007-02-18 00:21:28 +01:00
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2014-09-29 23:48:52 +02:00
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return OK;
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}
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2007-02-18 00:21:28 +01:00
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2014-09-29 23:48:52 +02:00
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/****************************************************************************
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* Name: mq_close
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*
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* Description:
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* Release a reference count on a message queue inode.
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*
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* Parameters:
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* inode - The message queue inode
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*
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* Return Value:
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* None
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*
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****************************************************************************/
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void mq_release(FAR struct inode *inode)
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{
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/* Decrement the reference count on the inode */
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2007-02-18 00:21:28 +01:00
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2014-09-29 23:48:52 +02:00
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inode_semtake();
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if (inode->i_crefs > 0)
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{
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inode->i_crefs--;
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}
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2007-02-18 00:21:28 +01:00
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2014-09-29 23:48:52 +02:00
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/* If the message queue was previously unlinked and the reference count
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* has decremented to zero, then release the message queue and delete
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* the inode now.
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*/
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2007-02-18 00:21:28 +01:00
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2014-09-29 23:48:52 +02:00
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if (inode->i_crefs <= 0 && (inode->i_flags & FSNODEFLAG_DELETED) != 0)
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{
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FAR struct mqueue_inode_s *msgq = inode->u.i_mqueue;
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DEBUGASSERT(msgq);
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/* Free the message queue (and any messages left in it) */
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2007-02-18 00:21:28 +01:00
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2014-09-29 23:48:52 +02:00
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mq_msgqfree(msgq);
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inode->u.i_mqueue = NULL;
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2007-02-18 00:21:28 +01:00
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2014-09-29 23:48:52 +02:00
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/* Release and free the inode container */
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2007-02-18 00:21:28 +01:00
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2014-09-29 23:33:34 +02:00
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inode_semgive();
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2014-09-29 23:48:52 +02:00
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inode_free(inode->i_child);
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kmm_free(inode);
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return;
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}
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2007-02-18 00:21:28 +01:00
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2014-09-29 23:48:52 +02:00
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inode_semgive();
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2007-02-18 00:21:28 +01:00
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}
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