From add995c32e86f9de8fa8fc05172435332c25a895 Mon Sep 17 00:00:00 2001 From: patacongo Date: Mon, 19 Dec 2011 19:24:09 +0000 Subject: Completes coding of the PWM module git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4200 7fd9a85b-ad96-42d3-883c-3090e2eb8679 --- nuttx/sched/mq_unlink.c | 146 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 146 insertions(+) create mode 100644 nuttx/sched/mq_unlink.c (limited to 'nuttx/sched/mq_unlink.c') diff --git a/nuttx/sched/mq_unlink.c b/nuttx/sched/mq_unlink.c new file mode 100644 index 000000000..0f1e63e48 --- /dev/null +++ b/nuttx/sched/mq_unlink.c @@ -0,0 +1,146 @@ +/************************************************************************ + * 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 "mq_internal.h" + +/************************************************************************ + * Pre-processor Definitions + ************************************************************************/ + +/************************************************************************ + * Private Type Declarations + ************************************************************************/ + +/************************************************************************ + * Global Variables + ************************************************************************/ + +/************************************************************************ + * Private Variables + ************************************************************************/ + +/************************************************************************ + * Private Functions + ************************************************************************/ + +/************************************************************************ + * Public Functions + ************************************************************************/ + +/************************************************************************ + * Function: 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; +} + -- cgit v1.2.3