127 lines
3.7 KiB
C
127 lines
3.7 KiB
C
/****************************************************************************
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* sched/wdog/wd_delete.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 <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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* Input 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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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is return to
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* indicate the nature of any failure.
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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 != NULL);
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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 kmm_free() to release the
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* memory. If the timer was released from an interrupt handler,
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* kmm_free() 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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kmm_free(wdog);
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}
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/* Check if this is pre-allocated timer. */
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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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/* This function should not be called for statically allocated timers. */
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else
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{
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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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