86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/****************************************************************************
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* sched/wdog/wd_gettime.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 <nuttx/wdog.h>
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#include <nuttx/irq.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_gettime
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*
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* Description:
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* This function returns the time remaining before the specified watchdog
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* timer expires.
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*
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* Input Parameters:
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* wdog - watchdog ID
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*
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* Returned Value:
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* The time in system ticks remaining until the watchdog time expires.
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* Zero means either that wdog is not valid or that the wdog has already
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* expired.
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*
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****************************************************************************/
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sclock_t wd_gettime(FAR struct wdog_s *wdog)
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{
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irqstate_t flags;
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/* Verify the wdog */
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flags = enter_critical_section();
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if (wdog != NULL && WDOG_ISACTIVE(wdog))
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{
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/* Traverse the watchdog list accumulating lag times until we find the
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* wdog that we are looking for
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*/
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FAR struct wdog_s *curr;
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sclock_t delay = 0;
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for (curr = (FAR struct wdog_s *)g_wdactivelist.head;
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curr != NULL;
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curr = curr->next)
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{
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delay += curr->lag;
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if (curr == wdog)
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{
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delay -= wd_elapse();
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leave_critical_section(flags);
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return delay;
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}
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}
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}
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leave_critical_section(flags);
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return 0;
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}
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