167 lines
5.4 KiB
C
167 lines
5.4 KiB
C
/****************************************************************************
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* sched/wdog/wdog.h
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*
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* Copyright (C) 2007, 2009, 2014 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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#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/wdog.h>
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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_wdfreelist data structure is a singly linked list of watchdogs
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* available to the system for delayed function use.
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*/
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extern sq_queue_t g_wdfreelist;
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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 the number of free, pre-allocated watchdog structures in the
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* g_wdfreelist. This value is used to enforce a reserve for interrupt
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* handlers.
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*/
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extern uint16_t g_wdnfree;
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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_initialize
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*
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* Description:
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* This function initializes the watchdog data structures
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*
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* Input Parameters:
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* None
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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 must be called early in the initialization sequence
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* before the timer interrupt is attached and before any watchdog
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* services are used.
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*
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****************************************************************************/
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void weak_function wd_initialize(void);
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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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*
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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);
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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 task_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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