?? tx_td.c
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/**************************************************************************/
/* */
/* Copyright (c) 1996-2000 by Express Logic Inc. */
/* */
/* This software is copyrighted by and is the sole property of Express */
/* Logic, Inc. All rights, title, ownership, or other interests */
/* in the software remain the property of Express Logic, Inc. This */
/* software may only be used in accordance with the corresponding */
/* license agreement. Any unauthorized use, duplication, transmission, */
/* distribution, or disclosure of this software is expressly forbidden. */
/* */
/* This Copyright notice may not be removed or modified without prior */
/* written consent of Express Logic, Inc. */
/* */
/* Express Logic, Inc. reserves the right to modify this software */
/* without notice. */
/* */
/* Express Logic, Inc. */
/* 11440 West Bernardo Court info@expresslogic.com */
/* Suite 366 http://www.expresslogic.com */
/* San Diego, CA 92127 */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** ThreadX Component */
/** */
/** Timer Management (TIM) */
/** */
/**************************************************************************/
/**************************************************************************/
#define TX_SOURCE_CODE
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_tim.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_timer_deactivate PORTABLE C */
/* 3.0f */
/* AUTHOR */
/* */
/* William E. Lamie, Express Logic, Inc. */
/* */
/* 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_timer_thread_entry Timer thread processing */
/* _tx_thread_sleep Thread sleep function */
/* _tx_timer_deactivate_api Application timer deactivate */
/* Suspension Timeouts */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 12-31-1996 William E. Lamie Initial Version 3.0 */
/* 07-04-1997 William E. Lamie Removed list head update of */
/* next timer unless the head */
/* of the timer list is */
/* removed, resulting in */
/* version 3.0a. */
/* 11-11-1997 William E. Lamie Modified comment(s), */
/* resulting in version 3.0b. */
/* 01-01-1999 William E. Lamie Modified comment(s), */
/* resulting in version 3.0e. */
/* 11-01-1999 William E. Lamie Modified comment(s), */
/* resulting in version 3.0f. */
/* */
/**************************************************************************/
UINT _tx_timer_deactivate(TX_INTERNAL_TIMER *timer_ptr)
{
TX_INTERRUPT_SAVE_AREA
/* Disable interrupts. */
TX_DISABLE
/* Determine if the timer still needs deactivation. */
if (timer_ptr -> tx_list_head)
{
/* Deactivate the timer. */
/* See if this is the only timer in the list. */
if (timer_ptr == timer_ptr -> tx_active_next)
{
/* Yes, the only timer on the list. */
/* Determine if the head pointer needs to be updated. */
if (*(timer_ptr -> tx_list_head) == timer_ptr)
{
/* Update the head pointer. */
*(timer_ptr -> tx_list_head) = TX_NULL;
}
/* Clear the timer's list head pointer. */
timer_ptr -> tx_list_head = TX_NULL;
}
else
{
/* At least one more timer is on the same expiration list. */
/* Update the links of the adjacent timers. */
(timer_ptr -> tx_active_next) -> tx_active_previous =
timer_ptr -> tx_active_previous;
(timer_ptr -> tx_active_previous) -> tx_active_next =
timer_ptr -> tx_active_next;
/* Determine if the head pointer needs to be updated. */
if (*(timer_ptr -> tx_list_head) == timer_ptr)
{
/* Update the next timer in the list with the list head
pointer. */
(timer_ptr -> tx_active_next) -> tx_list_head = timer_ptr -> tx_list_head;
/* Update the head pointer. */
*(timer_ptr -> tx_list_head) = timer_ptr -> tx_active_next;
}
/* Clear the timer's list head pointer. */
timer_ptr -> tx_list_head = TX_NULL;
}
}
/* Restore interrupts. */
TX_RESTORE
/* Return TX_SUCCESS. */
return(TX_SUCCESS);
}
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