/************************************************************************ * sched.mq_unlink.c * * Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include "os_internal.h" #include "mqueue/mqueue.h" /************************************************************************ * Pre-processor Definitions ************************************************************************/ /************************************************************************ * Private Type Declarations ************************************************************************/ /************************************************************************ * Global Variables ************************************************************************/ /************************************************************************ * Private Variables ************************************************************************/ /************************************************************************ * Private Functions ************************************************************************/ /************************************************************************ * Public Functions ************************************************************************/ /************************************************************************ * Name: mq_unlink * * Description: * This function removes the message queue named by "mq_name." If one * or more tasks have the message queue open when mq_unlink() is called, * removal of the message queue is postponed until all references to the * message queue have been closed. * * Parameters: * mq_name - Name of the message queue * * Return Value: * None * * Assumptions: * ************************************************************************/ int mq_unlink(const char *mq_name) { FAR msgq_t *msgq; irqstate_t saved_state; int ret = ERROR; /* Verify the input values */ if (mq_name) { sched_lock(); /* Find the named message queue */ msgq = mq_findnamed(mq_name); if (msgq) { /* If it is no longer connected, then we can just * discard the message queue now. */ if (!msgq->nconnect) { /* Remove the message queue from the list of all * message queues */ saved_state = irqsave(); (void)sq_rem((FAR sq_entry_t*)msgq, &g_msgqueues); irqrestore(saved_state); /* Then deallocate it (and any messages left in it) */ mq_msgqfree(msgq); } /* If the message queue is still connected to a message descriptor, * then mark it for deletion when the last message descriptor is * closed */ else { msgq->unlinked = true; } ret = OK; } sched_unlock(); } return ret; }