140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
/****************************************************************************
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* sched/wdog/wd_cancel.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <assert.h>
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#include <errno.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <nuttx/wdog.h>
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#include "sched/sched.h"
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#include "wdog/wdog.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: wd_cancel
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*
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* Description:
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* This function cancels a currently running watchdog timer. Watchdog
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* timers may be canceled from the interrupt level.
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*
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* Input Parameters:
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* wdog - ID of the watchdog to cancel.
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*
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* Returned Value:
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* Zero (OK) is returned on success; A negated errno value is returned to
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* indicate the nature of any failure.
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*
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****************************************************************************/
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int wd_cancel(WDOG_ID wdog)
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{
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FAR struct wdog_s *curr;
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FAR struct wdog_s *prev;
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irqstate_t flags;
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int ret = -EINVAL;
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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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flags = enter_critical_section();
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/* Make sure that the watchdog is initialized (non-NULL) and is still
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* active.
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*/
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if (wdog != NULL && WDOG_ISACTIVE(wdog))
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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 = (FAR struct wdog_s *)g_wdactivelist.head;
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while ((curr) && (curr != wdog))
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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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DEBUGASSERT(curr);
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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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/* Remove the watchdog from mid- or end-of-queue */
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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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/* Remove the watchdog at the head of the queue */
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sq_remfirst(&g_wdactivelist);
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/* Reassess the interval timer that will generate the next
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* interval event.
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*/
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sched_timer_reassess();
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}
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/* Mark the watchdog inactive */
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wdog->next = NULL;
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WDOG_CLRACTIVE(wdog);
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/* Return success */
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ret = OK;
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}
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leave_critical_section(flags);
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return ret;
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}
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