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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
#ifndef TX_NO_TIMER
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_timer.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_timer_system_activate PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function places the specified internal timer in the proper */
/* place in the timer expiration list. If the timer is already active */
/* this function does nothing. */
/* */
/* INPUT */
/* */
/* timer_ptr Pointer to timer control block */
/* */
/* OUTPUT */
/* */
/* TX_SUCCESS Always returns success */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _tx_thread_system_suspend Thread suspend function */
/* _tx_thread_system_ni_suspend Non-interruptable suspend thread */
/* _tx_timer_thread_entry Timer thread processing */
/* _tx_timer_activate Application timer activate */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 Scott Larson Modified comment(s), and */
/* opt out of function when */
/* TX_NO_TIMER is defined, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
VOID _tx_timer_system_activate(TX_TIMER_INTERNAL *timer_ptr)
{
TX_TIMER_INTERNAL **timer_list;
TX_TIMER_INTERNAL *next_timer;
TX_TIMER_INTERNAL *previous_timer;
ULONG delta;
ULONG remaining_ticks;
ULONG expiration_time;
/* Pickup the remaining ticks. */
remaining_ticks = timer_ptr -> tx_timer_internal_remaining_ticks;
/* Determine if there is a timer to activate. */
if (remaining_ticks != ((ULONG) 0))
{
/* Determine if the timer is set to wait forever. */
if (remaining_ticks != TX_WAIT_FOREVER)
{
/* Valid timer activate request. */
/* Determine if the timer still needs activation. */
if (timer_ptr -> tx_timer_internal_list_head == TX_NULL)
{
/* Activate the timer. */
/* Calculate the amount of time remaining for the timer. */
if (remaining_ticks > TX_TIMER_ENTRIES)
{
/* Set expiration time to the maximum number of entries. */
expiration_time = TX_TIMER_ENTRIES - ((ULONG) 1);
}
else
{
/* Timer value fits in the timer entries. */
/* Set the expiration time. */
expiration_time = (remaining_ticks - ((ULONG) 1));
}
/* At this point, we are ready to put the timer on one of
the timer lists. */
/* Calculate the proper place for the timer. */
timer_list = TX_TIMER_POINTER_ADD(_tx_timer_current_ptr, expiration_time);
if (TX_TIMER_INDIRECT_TO_VOID_POINTER_CONVERT(timer_list) >= TX_TIMER_INDIRECT_TO_VOID_POINTER_CONVERT(_tx_timer_list_end))
{
/* Wrap from the beginning of the list. */
delta = TX_TIMER_POINTER_DIF(timer_list, _tx_timer_list_end);
timer_list = TX_TIMER_POINTER_ADD(_tx_timer_list_start, delta);
}
/* Now put the timer on this list. */
if ((*timer_list) == TX_NULL)
{
/* This list is NULL, just put the new timer on it. */
/* Setup the links in this timer. */
timer_ptr -> tx_timer_internal_active_next = timer_ptr;
timer_ptr -> tx_timer_internal_active_previous = timer_ptr;
/* Setup the list head pointer. */
*timer_list = timer_ptr;
}
else
{
/* This list is not NULL, add current timer to the end. */
next_timer = *timer_list;
previous_timer = next_timer -> tx_timer_internal_active_previous;
previous_timer -> tx_timer_internal_active_next = timer_ptr;
next_timer -> tx_timer_internal_active_previous = timer_ptr;
timer_ptr -> tx_timer_internal_active_next = next_timer;
timer_ptr -> tx_timer_internal_active_previous = previous_timer;
}
/* Setup list head pointer. */
timer_ptr -> tx_timer_internal_list_head = timer_list;
}
}
}
}
#endif