?? tx_tda.c
字號(hào):
/**************************************************************************/
/* */
/* 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_api PORTABLE C */
/* 3.0f */
/* AUTHOR */
/* */
/* William E. Lamie, Express Logic, Inc. */
/* */
/* DESCRIPTION */
/* */
/* This function deactivates the specified application timer. */
/* */
/* INPUT */
/* */
/* timer_ptr Pointer to timer control block */
/* */
/* OUTPUT */
/* */
/* TX_SUCCESS Always returns success */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 12-31-1996 William E. Lamie Initial Version 3.0 */
/* 11-11-1997 William E. Lamie Modified comment(s), */
/* resulting in version 3.0b. */
/* 12-25-1997 William E. Lamie Added logic to calculate and */
/* save the remaining time */
/* left before expiration, */
/* resulting in version 3.0c. */
/* 03-01-1998 William E. Lamie Replaced the timer deactivate */
/* call with in-line logic, */
/* resulting in version 3.0d. */
/* 01-01-1999 William E. Lamie Modified comment(s), */
/* resulting in version 3.0e. */
/* 11-01-1999 William E. Lamie Modified comment(s), */
/* added logic to track events,*/
/* resulting in version 3.0f. */
/* */
/**************************************************************************/
UINT _tx_timer_deactivate_api(TX_TIMER *timer_ptr)
{
TX_INTERRUPT_SAVE_AREA
REG_1 TX_INTERNAL_TIMER *internal_ptr; /* Internal timer pointer */
REG_2 ULONG ticks_left; /* Ticks left before expiration */
/* Setup internal timer pointer. */
internal_ptr = &(timer_ptr -> tx_timer_internal);
/* Disable interrupts while the remaining time before expiration is
calculated. */
TX_DISABLE
/* Log this kernel call. */
TX_EL_TIMER_DEACTIVATE_INSERT
/* Determine if the head pointer is within the timer expiration list. */
if ((internal_ptr -> tx_list_head >= _tx_timer_list_start) &&
(internal_ptr -> tx_list_head < _tx_timer_list_end))
{
/* This timer is active and has not yet expired. */
/* Calculate the amount of time that has elapsed since the timer
was activated. */
/* Is this timer's entry after the current timer pointer? */
if (internal_ptr -> tx_list_head >= _tx_timer_current_ptr)
{
/* Calculate ticks left to expiration - just the difference between this
timer's entry and the current timer pointer. */
ticks_left = (internal_ptr -> tx_list_head - _tx_timer_current_ptr) + 1;
}
else
{
/* Calculate the ticks left with a wrapped list condition. */
ticks_left = (internal_ptr -> tx_list_head - _tx_timer_list_start);
ticks_left = ticks_left + (_tx_timer_list_end - _tx_timer_current_ptr) + 1;
}
/* Adjust the remaining ticks accordingly. */
if (internal_ptr -> tx_remaining_ticks > TX_TIMER_ENTRIES)
{
/* Subtract off the last full pass throught the timer list and add the
time left. */
internal_ptr -> tx_remaining_ticks =
(internal_ptr -> tx_remaining_ticks - TX_TIMER_ENTRIES) + ticks_left;
}
else
{
/* Just put the ticks left into the timer's remaining ticks. */
internal_ptr -> tx_remaining_ticks = ticks_left;
}
}
/* Determine if the timer still needs deactivation. */
if (internal_ptr -> tx_list_head)
{
/* See if this is the only timer in the list. */
if (internal_ptr == internal_ptr -> tx_active_next)
{
/* Yes, the only timer on the list. */
/* Determine if the head pointer needs to be updated. */
if (*(internal_ptr -> tx_list_head) == internal_ptr)
{
/* Update the head pointer. */
*(internal_ptr -> tx_list_head) = TX_NULL;
}
/* Clear the timer's list head pointer. */
internal_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. */
(internal_ptr -> tx_active_next) -> tx_active_previous =
internal_ptr -> tx_active_previous;
(internal_ptr -> tx_active_previous) -> tx_active_next =
internal_ptr -> tx_active_next;
/* Determine if the head pointer needs to be updated. */
if (*(internal_ptr -> tx_list_head) == internal_ptr)
{
/* Update the next timer in the list with the list head
pointer. */
(internal_ptr -> tx_active_next) -> tx_list_head = internal_ptr -> tx_list_head;
/* Update the head pointer. */
*(internal_ptr -> tx_list_head) = internal_ptr -> tx_active_next;
}
/* Clear the timer's list head pointer. */
internal_ptr -> tx_list_head = TX_NULL;
}
}
/* Restore interrupts to previous posture. */
TX_RESTORE
/* Return TX_SUCCESS. */
return(TX_SUCCESS);
}
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