a60059d9d0
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@20 42af7a65-404d-4744-a932-0658087f49c3
144 lines
4.5 KiB
C
144 lines
4.5 KiB
C
/************************************************************
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* mq_unlink.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 Gregory Nutt 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 <sys/types.h> /* uint32, etc. */
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#include <mqueue.h>
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#include <sched.h>
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#include "os_internal.h"
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#include "mq_internal.h"
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/************************************************************
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* Definitions
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************************************************************/
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/************************************************************
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* Private Type Declarations
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************************************************************/
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/************************************************************
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* Global Variables
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************************************************************/
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/************************************************************
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* Private Variables
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************************************************************/
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/************************************************************
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* Private Functions
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************************************************************/
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/************************************************************
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* Public Functions
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************************************************************/
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/************************************************************
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* Function: mq_unlink
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*
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* Description:
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* This function removes the message queue named by
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* "mq_name." If one or more tasks have the message queue
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* open when mq_unlink() is called, removal of the message
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* queue is postponed until all references to the message
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* queue have been closed.
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*
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* Parameters:
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* mq_name - Name of the message queue
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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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*
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************************************************************/
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int mq_unlink(const char *mq_name)
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{
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FAR msgq_t *msgq;
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irqstate_t saved_state;
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int ret = ERROR;
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/* Verify the input values */
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if (mq_name)
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{
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sched_lock();
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/* Find the named message queue */
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msgq = mq_findnamed(mq_name);
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if (msgq)
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{
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/* If it is no longer connected, then we can just
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* discard the message queue now.
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*/
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if (!msgq->nconnect)
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{
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/* Remove the message queue from the list of all
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* message queues
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*/
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saved_state = irqsave();
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(void)sq_rem((FAR sq_entry_t*)msgq, &g_msgqueues);
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irqrestore(saved_state);
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/* Then deallocate it (and any messages left in it) */
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mq_msgqfree(msgq);
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}
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/* If the message queue is still connected to a message descriptor,
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* then mark it for deletion when the last message descriptor is
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* closed
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*/
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else
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{
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msgq->unlinked = TRUE;
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}
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ret = OK;
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}
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sched_unlock();
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}
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return ret;
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}
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