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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_info_get PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function retrieves information from the specified timer. */
/* */
/* INPUT */
/* */
/* timer_ptr Pointer to timer control block */
/* name Destination for the timer name */
/* active Destination for active flag */
/* remaining_ticks Destination for remaining ticks */
/* before expiration */
/* reschedule_ticks Destination for reschedule ticks */
/* next_timer Destination for next timer on the */
/* created list */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* 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_info_get(TX_TIMER *timer_ptr, CHAR **name, UINT *active, ULONG *remaining_ticks,
ULONG *reschedule_ticks, TX_TIMER **next_timer)
{
TX_INTERRUPT_SAVE_AREA
TX_TIMER_INTERNAL *internal_ptr;
TX_TIMER_INTERNAL **list_head;
ULONG ticks_left;
UINT timer_active;
UINT active_timer_list;
/* Disable interrupts. */
TX_DISABLE
/* If trace is enabled, insert this event into the trace buffer. */
TX_TRACE_IN_LINE_INSERT(TX_TRACE_TIMER_INFO_GET, timer_ptr, TX_POINTER_TO_ULONG_CONVERT(&ticks_left), 0, 0, TX_TRACE_TIMER_EVENTS)
/* Log this kernel call. */
TX_EL_TIMER_INFO_GET_INSERT
/* Retrieve the name of the timer. */
if (name != TX_NULL)
{
*name = timer_ptr -> tx_timer_name;
}
/* Pickup address of internal timer structure. */
internal_ptr = &(timer_ptr -> tx_timer_internal);
/* Retrieve all the pertinent information and return it in the supplied
destinations. */
/* Default active to false. */
timer_active = TX_FALSE;
/* Default the ticks left to the remaining ticks. */
ticks_left = internal_ptr -> tx_timer_internal_remaining_ticks;
/* Determine if the timer is still active. */
if (internal_ptr -> tx_timer_internal_list_head != TX_NULL)
{
/* Indicate this timer is active. */
timer_active = TX_TRUE;
/* Default the active timer list flag to false. */
active_timer_list = TX_FALSE;
/* Determine if the timer is still active. */
if (internal_ptr -> tx_timer_internal_list_head >= _tx_timer_list_start)
{
/* Determine if the list head is before the end of the list. */
if (internal_ptr -> tx_timer_internal_list_head < _tx_timer_list_end)
{
/* This timer is active and has not yet expired. */
active_timer_list = TX_TRUE;
}
}
/* Determine if the timer is on the active timer list. */
if (active_timer_list == TX_TRUE)
{
/* Calculate the amount of time that has elapsed since the timer
was activated. */
/* Setup the list head pointer. */
list_head = internal_ptr -> tx_timer_internal_list_head;
/* Is this timer's entry after the current timer pointer? */
if (internal_ptr -> tx_timer_internal_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 = ((TX_TIMER_POINTER_DIF(list_head, _tx_timer_current_ptr)) + ((ULONG) 1));
}
else
{
/* Calculate the ticks left with a wrapped list condition. */
ticks_left = ((TX_TIMER_POINTER_DIF(list_head, _tx_timer_list_start)));
ticks_left = ticks_left + ((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. */
ticks_left = (internal_ptr -> tx_timer_internal_remaining_ticks - TX_TIMER_ENTRIES) + ticks_left;
}
}
else
{
/* The timer is not on the actual timer list so it must either be being processed
or on a temporary list to be processed. */
/* Check to see if this timer is the timer currently being processed. */
if (_tx_timer_expired_timer_ptr == internal_ptr)
{
/* Timer dispatch routine is executing, waiting to execute, or just finishing. No more remaining ticks for this expiration. */
ticks_left = ((ULONG) 0);
}
else
{
/* Timer is not the one being processed, which means it must be on the temporary expiration list
waiting to be processed. */
/* Calculate the remaining ticks for a timer in the process of expiring. */
if (ticks_left > TX_TIMER_ENTRIES)
{
/* Calculate the number of ticks remaining. */
ticks_left = internal_ptr -> tx_timer_internal_remaining_ticks - TX_TIMER_ENTRIES;
}
else
{
/* Timer dispatch routine is waiting to execute, no more remaining ticks for this expiration. */
ticks_left = ((ULONG) 0);
}
}
}
}
/* Setup return values for an inactive timer. */
if (active != TX_NULL)
{
/* Setup the timer active indication. */
*active = timer_active;
}
if (remaining_ticks != TX_NULL)
{
/* Setup the default remaining ticks value. */
*remaining_ticks = ticks_left;
}
/* Pickup the reschedule ticks value. */
if (reschedule_ticks != TX_NULL)
{
*reschedule_ticks = internal_ptr -> tx_timer_internal_re_initialize_ticks;
}
/* Pickup the next created application timer. */
if (next_timer != TX_NULL)
{
*next_timer = timer_ptr -> tx_timer_created_next;
}
/* Restore interrupts. */
TX_RESTORE
/* Return completion status. */
return(TX_SUCCESS);
}
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