mirror of
https://github.com/azure-rtos/threadx
synced 2025-01-30 08:02:57 +08:00
164 lines
7.8 KiB
C
164 lines
7.8 KiB
C
/***************************************************************************
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* Copyright (c) 2024 Microsoft Corporation
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*
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* This program and the accompanying materials are made available under the
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* terms of the MIT License which is available at
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* https://opensource.org/licenses/MIT.
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*
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* SPDX-License-Identifier: MIT
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**************************************************************************/
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/**************************************************************************/
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/**************************************************************************/
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/** */
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/** ThreadX Component */
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/** */
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/** Timer */
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/** */
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/**************************************************************************/
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/**************************************************************************/
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#define TX_SOURCE_CODE
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/* Include necessary system files. */
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#include "tx_api.h"
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#include "tx_timer.h"
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/**************************************************************************/
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/* */
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/* FUNCTION RELEASE */
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/* */
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/* _tx_timer_system_activate PORTABLE C */
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/* 6.1 */
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/* AUTHOR */
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/* */
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/* William E. Lamie, Microsoft Corporation */
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/* */
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/* DESCRIPTION */
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/* */
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/* This function places the specified internal timer in the proper */
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/* place in the timer expiration list. If the timer is already active */
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/* this function does nothing. */
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/* */
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/* INPUT */
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/* */
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/* timer_ptr Pointer to timer control block */
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/* */
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/* OUTPUT */
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/* */
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/* TX_SUCCESS Always returns success */
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/* */
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/* CALLS */
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/* */
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/* None */
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/* */
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/* CALLED BY */
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/* */
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/* _tx_thread_system_suspend Thread suspend function */
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/* _tx_thread_system_ni_suspend Non-interruptable suspend thread */
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/* _tx_timer_thread_entry Timer thread processing */
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/* _tx_timer_activate Application timer activate */
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/* */
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/* RELEASE HISTORY */
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/* */
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/* DATE NAME DESCRIPTION */
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/* */
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/* 09-30-2020 William E. Lamie Initial Version 6.1 */
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/* */
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/**************************************************************************/
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VOID _tx_timer_system_activate(TX_TIMER_INTERNAL *timer_ptr)
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{
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TX_TIMER_INTERNAL **timer_list;
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TX_TIMER_INTERNAL *next_timer;
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TX_TIMER_INTERNAL *previous_timer;
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ULONG delta;
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ULONG remaining_ticks;
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ULONG expiration_time;
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/* Pickup the remaining ticks. */
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remaining_ticks = timer_ptr -> tx_timer_internal_remaining_ticks;
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/* Determine if there is a timer to activate. */
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if (remaining_ticks != ((ULONG) 0))
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{
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/* Determine if the timer is set to wait forever. */
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if (remaining_ticks != TX_WAIT_FOREVER)
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{
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/* Valid timer activate request. */
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/* Determine if the timer still needs activation. */
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if (timer_ptr -> tx_timer_internal_list_head == TX_NULL)
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{
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/* Activate the timer. */
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/* Calculate the amount of time remaining for the timer. */
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if (remaining_ticks > TX_TIMER_ENTRIES)
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{
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/* Set expiration time to the maximum number of entries. */
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expiration_time = TX_TIMER_ENTRIES - ((ULONG) 1);
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}
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else
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{
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/* Timer value fits in the timer entries. */
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/* Set the expiration time. */
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expiration_time = (remaining_ticks - ((ULONG) 1));
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}
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/* At this point, we are ready to put the timer on one of
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the timer lists. */
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/* Calculate the proper place for the timer. */
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timer_list = TX_TIMER_POINTER_ADD(_tx_timer_current_ptr, expiration_time);
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if (TX_TIMER_INDIRECT_TO_VOID_POINTER_CONVERT(timer_list) >= TX_TIMER_INDIRECT_TO_VOID_POINTER_CONVERT(_tx_timer_list_end))
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{
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/* Wrap from the beginning of the list. */
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delta = TX_TIMER_POINTER_DIF(timer_list, _tx_timer_list_end);
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timer_list = TX_TIMER_POINTER_ADD(_tx_timer_list_start, delta);
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}
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/* Now put the timer on this list. */
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if ((*timer_list) == TX_NULL)
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{
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/* This list is NULL, just put the new timer on it. */
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/* Setup the links in this timer. */
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timer_ptr -> tx_timer_internal_active_next = timer_ptr;
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timer_ptr -> tx_timer_internal_active_previous = timer_ptr;
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/* Setup the list head pointer. */
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*timer_list = timer_ptr;
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}
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else
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{
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/* This list is not NULL, add current timer to the end. */
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next_timer = *timer_list;
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previous_timer = next_timer -> tx_timer_internal_active_previous;
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previous_timer -> tx_timer_internal_active_next = timer_ptr;
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next_timer -> tx_timer_internal_active_previous = timer_ptr;
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timer_ptr -> tx_timer_internal_active_next = next_timer;
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timer_ptr -> tx_timer_internal_active_previous = previous_timer;
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}
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/* Setup list head pointer. */
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timer_ptr -> tx_timer_internal_list_head = timer_list;
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}
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}
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}
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}
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