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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** ThreadX Component */
/** */
/** Timer */
/** */
/**************************************************************************/
/**************************************************************************/
#define TX_SOURCE_CODE
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_timer.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_timer_system_deactivate PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function deactivates, or removes the timer from the active */
/* timer expiration list. If the timer is already deactivated, this */
/* function just returns. */
/* */
/* INPUT */
/* */
/* timer_ptr Pointer to timer control block */
/* */
/* OUTPUT */
/* */
/* TX_SUCCESS Always returns success */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _tx_thread_system_resume Thread resume function */
/* _tx_timer_thread_entry Timer thread processing */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
VOID _tx_timer_system_deactivate(TX_TIMER_INTERNAL *timer_ptr)
{
TX_TIMER_INTERNAL **list_head;
TX_TIMER_INTERNAL *next_timer;
TX_TIMER_INTERNAL *previous_timer;
/* Pickup the list head pointer. */
list_head = timer_ptr -> tx_timer_internal_list_head;
/* Determine if the timer still needs deactivation. */
if (list_head != TX_NULL)
{
/* Deactivate the timer. */
/* Pickup the next active timer. */
next_timer = timer_ptr -> tx_timer_internal_active_next;
/* See if this is the only timer in the list. */
if (timer_ptr == next_timer)
{
/* Yes, the only timer on the list. */
/* Determine if the head pointer needs to be updated. */
if (*(list_head) == timer_ptr)
{
/* Update the head pointer. */
*(list_head) = TX_NULL;
}
}
else
{
/* At least one more timer is on the same expiration list. */
/* Update the links of the adjacent timers. */
previous_timer = timer_ptr -> tx_timer_internal_active_previous;
next_timer -> tx_timer_internal_active_previous = previous_timer;
previous_timer -> tx_timer_internal_active_next = next_timer;
/* Determine if the head pointer needs to be updated. */
if (*(list_head) == timer_ptr)
{
/* Update the next timer in the list with the list head pointer. */
next_timer -> tx_timer_internal_list_head = list_head;
/* Update the head pointer. */
*(list_head) = next_timer;
}
}
/* Clear the timer's list head pointer. */
timer_ptr -> tx_timer_internal_list_head = TX_NULL;
}
}