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/********************************************************************************
* sched/wdog/wd_gettime.c
*
* Copyright (C) 2007, 2009, 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <nuttx/config.h>
#include <wdog.h>
#include "wdog/wdog.h"
/********************************************************************************
* Definitions
********************************************************************************/
/********************************************************************************
* Private Types
********************************************************************************/
/********************************************************************************
* Global Variables
********************************************************************************/
/********************************************************************************
* Private Variables
********************************************************************************/
/********************************************************************************
* Private Functions
********************************************************************************/
/********************************************************************************
* Public Functions
********************************************************************************/
/********************************************************************************
* Name: wd_gettime
*
* Description:
* This function returns the time remaining before the specified watchdog
* expires.
*
* Parameters:
* wdog = watchdog ID
*
* Return Value:
* The time in system ticks remaining until the watchdog time expires. Zero
* means either that wdog is not valid or that the wdog has already expired.
*
* Assumptions:
*
********************************************************************************/
int wd_gettime(WDOG_ID wdog)
{
irqstate_t flags;
/* Verify the wdog */
flags = irqsave();
if (wdog && WDOG_ISACTIVE(wdog))
{
/* Traverse the watchdog list accumulating lag times until we find the wdog
* that we are looking for
*/
wdog_t *curr;
int delay = 0;
for (curr = (wdog_t*)g_wdactivelist.head; curr; curr = curr->next)
{
delay += curr->lag;
if (curr == wdog)
{
irqrestore(flags);
return delay;
}
}
}
irqrestore(flags);
return 0;
}
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