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/****************************************************************************
* sched/wdog/wd_delete.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 <queue.h>
#include <assert.h>
#include <errno.h>
#include <nuttx/arch.h>
#include <nuttx/wdog.h>
#include <nuttx/kmalloc.h>
#include "wdog/wdog.h"
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Type Declarations
****************************************************************************/
/****************************************************************************
* Global Variables
****************************************************************************/
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: wd_delete
*
* Description:
* The wd_delete function will deallocate a watchdog by returning it to
* the free pool of watchdogs. The watchdog will be removed from the timer
* queue if has been started.
*
* Parameters:
* wdog - The watchdog ID to delete. This is actually a pointer to a
* watchdog structure.
*
* Return Value:
* Returns OK or ERROR
*
* Assumptions:
* The caller has assured that the watchdog is no longer in use.
*
****************************************************************************/
int wd_delete(WDOG_ID wdog)
{
irqstate_t state;
DEBUGASSERT(wdog);
/* The following steps are atomic... the watchdog must not be active when
* it is being deallocated.
*/
state = irqsave();
/* Check if the watchdog has been started. */
if (WDOG_ISACTIVE(wdog))
{
/* Yes.. stop it */
wd_cancel(wdog);
}
/* Did this watchdog come from the pool of pre-allocated timers? Or, was
* it allocated from the heap?
*/
if (WDOG_ISALLOCED(wdog))
{
/* It was allocated from the heap. Use sched_kfree() to release the
* memory. If the timer was released from an interrupt handler,
* sched_kfree() will defer the actual deallocation of the memory
* until a more appropriate time.
*
* We don't need interrupts disabled to do this.
*/
irqrestore(state);
sched_kfree(wdog);
}
/* This was a pre-allocated timer. This function should not be called for
* statically allocated timers.
*/
else if (!WDOG_ISSTATIC(wdog))
{
/* Put the timer back on the free list and increment the count of free
* timers, all with interrupts disabled.
*/
sq_addlast((FAR sq_entry_t*)wdog, &g_wdfreelist);
g_wdnfree++;
DEBUGASSERT(g_wdnfree <= CONFIG_PREALLOC_WDOGS);
irqrestore(state);
}
/* Return success */
return OK;
}
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