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146 lines
4.8 KiB
146 lines
4.8 KiB
/************************************************************************ |
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* sched.mq_unlink.c |
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* |
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* Copyright (C) 2007, 2009 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 <stdbool.h> |
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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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* Pre-processor 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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* Name: mq_unlink |
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* |
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* Description: |
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* This function removes the message queue named by "mq_name." If one |
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* or more tasks have the message queue open when mq_unlink() is called, |
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* removal of the message queue is postponed until all references to the |
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* message 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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