124 lines
4.6 KiB
C
124 lines
4.6 KiB
C
/****************************************************************************
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* sched/work_cancel.c
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*
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* Copyright (C) 2009-2010 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 <queue.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/wqueue.h>
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#include "work_internal.h"
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#ifdef CONFIG_SCHED_WORKQUEUE
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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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* Public 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: work_cancel
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*
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* Description:
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* Cancel previously queued work. This removes work from the work queue.
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* After work has been canceled, it may be re-queue by calling work_queue()
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* again.
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*
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* Input parameters:
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* work - The previously queue work structure to cancel
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*
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* Returned Value:
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* Zero on success, a negated errno on failure
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*
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****************************************************************************/
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int work_cancel(struct work_s *work)
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{
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irqstate_t flags;
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DEBUGASSERT(work != NULL);
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/* Cancelling the work is simply a matter of removing the work structure
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* from the work queue. This must be done with interrupts disabled because
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* new work is typically added to the work queue from interrupt handlers.
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*/
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flags = irqsave();
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if (work->worker != NULL)
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{
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/* A little test of the integrity of the work queue */
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DEBUGASSERT(work->dq.flink ||(FAR dq_entry_t *)work == g_work.tail);
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DEBUGASSERT(work->dq.blink ||(FAR dq_entry_t *)work == g_work.head);
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/* Remove the entry from the work queue and make sure that it is
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* mark as availalbe (i.e., the worker field is nullified).
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*/
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dq_rem((FAR dq_entry_t *)work, &g_work);
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work->worker = NULL;
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}
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irqrestore(flags);
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return OK;
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}
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#endif /* CONFIG_SCHED_WORKQUEUE */
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