162 lines
5.2 KiB
C
162 lines
5.2 KiB
C
/****************************************************************************
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* wd_cancel.c
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*
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* Copyright (C) 2007, 2008 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 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 <sys/types.h>
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#include <assert.h>
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#include <wdog.h>
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#include <nuttx/arch.h>
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#include "os_internal.h"
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#include "wd_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: wd_cancel
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*
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* Description:
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* This function cancels a currently running watchdog timer.
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* Watchdog timers may be canceled from the interrupt level.
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*
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* Parameters:
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* wdid - ID of the watchdog to cancel.
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*
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* Return Value:
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* OK or ERROR
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*
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* Assumptions:
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*
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****************************************************************************/
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STATUS wd_cancel (WDOG_ID wdid)
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{
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wdog_t *curr;
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wdog_t *prev;
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irqstate_t saved_state;
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STATUS ret = ERROR;
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/* Prohibit timer interactions with the timer queue until the
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* cancellation is complete
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*/
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saved_state = irqsave();
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/* Make sure that the the watchdog is still active */
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if (wdid->active)
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{
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/* Search the g_wdactivelist for the target FCB. We can't use sq_rem
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* to do this because there are additional operations that need to be
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* done.
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*/
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prev = NULL;
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curr = (wdog_t*)g_wdactivelist.head;
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while((curr) && (curr != wdid))
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{
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prev = curr;
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curr = curr->next;
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}
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/* Check if the watchdog was found in the list. If not, then an OS
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* error has occurred because the watchdog is marked active!
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*/
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if (!curr)
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{
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PANIC(OSERR_WDOGNOTFOUND);
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}
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else
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{
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/* If there is a watchdog in the timer queue after the one that
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* is being canceled, then it inherits the remaining ticks.
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*/
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if (curr->next)
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{
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curr->next->lag += curr->lag;
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}
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/* Now, remove the watchdog from the timer queue */
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if (prev)
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{
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(void)sq_remafter((FAR sq_entry_t*)prev, &g_wdactivelist);
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}
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else
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{
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(void)sq_remfirst(&g_wdactivelist);
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}
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wdid->next = NULL;
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/* Return success */
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ret = OK;
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}
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/* Mark the watchdog inactive */
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wdid->active = FALSE;
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}
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irqrestore(saved_state);
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return ret;
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}
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