150 lines
4.9 KiB
C
150 lines
4.9 KiB
C
/****************************************************************************
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* sched/wdog/wdog.h
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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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#ifndef __SCHED_WDOG_WDOG_H
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#define __SCHED_WDOG_WDOG_H
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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 <stdint.h>
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#include <stdbool.h>
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#include <nuttx/compiler.h>
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#include <nuttx/clock.h>
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#include <nuttx/queue.h>
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#include <nuttx/wdog.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Name: wd_elapse
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*
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* Description:
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* This function is used to get time-elapse from last time wd_timer() be
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* called. In case of CONFIG_SCHED_TICKLESS configured, wd_timer() may
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* take lots of ticks, during this time, wd_start()/wd_cancel() may
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* called, so we need wd_elapse() to correct the delay/lag.
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*
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****************************************************************************/
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#ifdef CONFIG_SCHED_TICKLESS
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# define wd_elapse() (clock_systime_ticks() - g_wdtickbase)
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#else
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# define wd_elapse() (0)
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#endif
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/* The g_wdactivelist data structure is a singly linked list ordered by
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* watchdog expiration time. When watchdog timers expire,the functions on
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* this linked list are removed and the function is called.
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*/
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extern sq_queue_t g_wdactivelist;
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/* This is wdog tickbase, for wd_gettime() may called many times
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* between 2 times of wd_timer(), we use it to update wd_gettime().
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*/
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#ifdef CONFIG_SCHED_TICKLESS
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extern clock_t g_wdtickbase;
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: wd_timer
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*
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* Description:
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* This function is called from the timer interrupt handler to determine
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* if it is time to execute a watchdog function. If so, the watchdog
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* function will be executed in the context of the timer interrupt
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* handler.
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*
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* Input Parameters:
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* ticks - If CONFIG_SCHED_TICKLESS is defined then the number of ticks
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* in the interval that just expired is provided. Otherwise,
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* this function is called on each timer interrupt and a value of one
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* is implicit.
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* noswitches - True: Can't do context switches now.
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*
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* Returned Value:
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* If CONFIG_SCHED_TICKLESS is defined then the number of ticks for the
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* next delay is provided (zero if no delay). Otherwise, this function
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* has no returned value.
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*
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* Assumptions:
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* Called from interrupt handler logic with interrupts disabled.
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*
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****************************************************************************/
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#ifdef CONFIG_SCHED_TICKLESS
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unsigned int wd_timer(int ticks, bool noswitches);
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#else
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void wd_timer(void);
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#endif
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/****************************************************************************
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* Name: wd_recover
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*
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* Description:
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* This function is called from nxtask_recover() when a task is deleted via
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* task_delete() or via pthread_cancel(). It checks if the deleted task
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* is waiting for a timed event and if so cancels the timeout
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*
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* Input Parameters:
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* tcb - The TCB of the terminated task or thread
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*
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* Returned Value:
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* None.
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*
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* Assumptions:
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* This function is called from task deletion logic in a safe context.
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*
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****************************************************************************/
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struct tcb_s;
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void wd_recover(FAR struct tcb_s *tcb);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __SCHED_WDOG_WDOG_H */
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