136 lines
4.4 KiB
C
136 lines
4.4 KiB
C
/****************************************************************************
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* sched/wdog/wd_delete.c
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*
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* Copyright (C) 2007-2009, 2014, 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 <nuttx/config.h>
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#include <queue.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 <nuttx/kmalloc.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_delete
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*
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* Description:
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* The wd_delete() function will deallocate a watchdog timer by returning
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* it to the free pool of watchdog timers. The watchdog timer will be
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* removed from the active timer queue if had been started.
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*
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* Parameters:
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* wdog - The watchdog ID to delete. This is actually a pointer to a
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* watchdog structure.
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*
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* Return Value:
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* Returns OK or ERROR
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*
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* Assumptions:
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* The caller has assured that the watchdog is no longer in use.
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*
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****************************************************************************/
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int wd_delete(WDOG_ID wdog)
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{
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irqstate_t flags;
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DEBUGASSERT(wdog);
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/* The following steps are atomic... the watchdog must not be active when
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* it is being deallocated.
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*/
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flags = enter_critical_section();
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/* Check if the watchdog has been started. */
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if (WDOG_ISACTIVE(wdog))
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{
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/* Yes.. stop it */
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wd_cancel(wdog);
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}
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/* Did this watchdog come from the pool of pre-allocated timers? Or, was
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* it allocated from the heap?
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*/
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if (WDOG_ISALLOCED(wdog))
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{
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/* It was allocated from the heap. Use sched_kfree() to release the
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* memory. If the timer was released from an interrupt handler,
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* sched_kfree() will defer the actual deallocation of the memory
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* until a more appropriate time.
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*
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* We don't need interrupts disabled to do this.
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*/
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leave_critical_section(flags);
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sched_kfree(wdog);
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}
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/* This was a pre-allocated timer. This function should not be called for
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* statically allocated timers.
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*/
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else if (!WDOG_ISSTATIC(wdog))
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{
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/* Put the timer back on the free list and increment the count of free
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* timers, all with interrupts disabled.
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*/
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sq_addlast((FAR sq_entry_t *)wdog, &g_wdfreelist);
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g_wdnfree++;
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DEBUGASSERT(g_wdnfree <= CONFIG_PREALLOC_WDOGS);
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leave_critical_section(flags);
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}
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/* Return success */
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return OK;
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}
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