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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_trace.h"
#include "tx_timer.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_timer_deactivate PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* 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 */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _tx_timer_deactivate(TX_TIMER *timer_ptr)
{
TX_INTERRUPT_SAVE_AREA
TX_TIMER_INTERNAL *internal_ptr;
TX_TIMER_INTERNAL **list_head;
TX_TIMER_INTERNAL *next_timer;
TX_TIMER_INTERNAL *previous_timer;
ULONG ticks_left;
UINT active_timer_list;
/* Setup internal timer pointer. */
internal_ptr = &(timer_ptr -> tx_timer_internal);
/* Disable interrupts while the remaining time before expiration is
calculated. */
TX_DISABLE
#ifdef TX_TIMER_ENABLE_PERFORMANCE_INFO
/* Increment the total deactivations counter. */
_tx_timer_performance_deactivate_count++;
/* Increment the number of deactivations on this timer. */
timer_ptr -> tx_timer_performance_deactivate_count++;
#endif
/* If trace is enabled, insert this event into the trace buffer. */
TX_TRACE_IN_LINE_INSERT(TX_TRACE_TIMER_DEACTIVATE, timer_ptr, TX_POINTER_TO_ULONG_CONVERT(&ticks_left), 0, 0, TX_TRACE_TIMER_EVENTS)
/* Log this kernel call. */
TX_EL_TIMER_DEACTIVATE_INSERT
/* Pickup the list head. */
list_head = internal_ptr -> tx_timer_internal_list_head;
/* Is the timer active? */
if (list_head != TX_NULL)
{
/* Default the active timer list flag to false. */
active_timer_list = TX_FALSE;
/* Determine if the head pointer is within the timer expiration list. */
if (TX_TIMER_INDIRECT_TO_VOID_POINTER_CONVERT(list_head) >= TX_TIMER_INDIRECT_TO_VOID_POINTER_CONVERT(_tx_timer_list_start))
{
/* Now check to make sure the list head is before the end of the list. */
if (TX_TIMER_INDIRECT_TO_VOID_POINTER_CONVERT(list_head) < TX_TIMER_INDIRECT_TO_VOID_POINTER_CONVERT(_tx_timer_list_end))
{
/* Set the active timer list flag to true. */
active_timer_list = TX_TRUE;
}
}
/* Determine if the timer is on active timer list. */
if (active_timer_list == TX_TRUE)
{
/* 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 (TX_TIMER_INDIRECT_TO_VOID_POINTER_CONVERT(list_head) >= TX_TIMER_INDIRECT_TO_VOID_POINTER_CONVERT(_tx_timer_current_ptr))
{
/* Calculate ticks left to expiration - just the difference between this
timer's entry and the current timer pointer. */
ticks_left = (ULONG) (TX_TIMER_POINTER_DIF(list_head,_tx_timer_current_ptr)) + ((ULONG) 1);
}
else
{
/* Calculate the ticks left with a wrapped list condition. */
ticks_left = (ULONG) (TX_TIMER_POINTER_DIF(list_head,_tx_timer_list_start));
ticks_left = ticks_left + (ULONG) ((TX_TIMER_POINTER_DIF(_tx_timer_list_end, _tx_timer_current_ptr)) + ((ULONG) 1));
}
/* Adjust the remaining ticks accordingly. */
if (internal_ptr -> tx_timer_internal_remaining_ticks > TX_TIMER_ENTRIES)
{
/* Subtract off the last full pass through the timer list and add the
time left. */
internal_ptr -> tx_timer_internal_remaining_ticks =
(internal_ptr -> tx_timer_internal_remaining_ticks - TX_TIMER_ENTRIES) + ticks_left;
}
else
{
/* Just put the ticks left into the timer's remaining ticks. */
internal_ptr -> tx_timer_internal_remaining_ticks = ticks_left;
}
}
else
{
/* Determine if this is timer has just expired. */
if (_tx_timer_expired_timer_ptr != internal_ptr)
{
/* No, it hasn't expired. Now check for remaining time greater than the list
size. */
if (internal_ptr -> tx_timer_internal_remaining_ticks > TX_TIMER_ENTRIES)
{
/* Adjust the remaining ticks. */
internal_ptr -> tx_timer_internal_remaining_ticks =
internal_ptr -> tx_timer_internal_remaining_ticks - TX_TIMER_ENTRIES;
}
else
{
/* Set the remaining time to the reactivation time. */
internal_ptr -> tx_timer_internal_remaining_ticks = internal_ptr -> tx_timer_internal_re_initialize_ticks;
}
}
else
{
/* Set the remaining time to the reactivation time. */
internal_ptr -> tx_timer_internal_remaining_ticks = internal_ptr -> tx_timer_internal_re_initialize_ticks;
}
}
/* Pickup the next timer. */
next_timer = internal_ptr -> tx_timer_internal_active_next;
/* See if this is the only timer in the list. */
if (internal_ptr == next_timer)
{
/* Yes, the only timer on the list. */
/* Determine if the head pointer needs to be updated. */
if (*(list_head) == internal_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 = internal_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) == internal_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. */
internal_ptr -> tx_timer_internal_list_head = TX_NULL;
}
/* Restore interrupts to previous posture. */
TX_RESTORE
/* Return TX_SUCCESS. */
return(TX_SUCCESS);
}
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