mirror of
https://github.com/azure-rtos/threadx
synced 2025-02-06 08:08:27 +08:00
191 lines
8.5 KiB
C
191 lines
8.5 KiB
C
/**************************************************************************/
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/* */
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/* Copyright (c) Microsoft Corporation. All rights reserved. */
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/* */
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/* This software is licensed under the Microsoft Software License */
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/* Terms for Microsoft Azure RTOS. Full text of the license can be */
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/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
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/* and in the root directory of this software. */
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/* */
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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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/** Thread */
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/** */
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/**************************************************************************/
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/**************************************************************************/
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#define TX_SOURCE_CODE
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#ifndef TX_NO_TIMER
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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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#include "tx_thread.h"
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#include "tx_trace.h"
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/**************************************************************************/
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/* */
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/* FUNCTION RELEASE */
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/* */
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/* _tx_thread_time_slice 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 moves the currently executing thread to the end of */
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/* the threads ready at the same priority level as a result of a */
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/* time-slice interrupt. If no other thread of the same priority is */
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/* ready, this function simply returns. */
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/* */
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/* INPUT */
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/* */
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/* None */
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/* */
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/* OUTPUT */
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/* */
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/* None */
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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_timer_interrupt Timer interrupt handling */
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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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/* 05-19-2020 William E. Lamie Initial Version 6.0 */
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/* 09-30-2020 Scott Larson Modified comment(s), and */
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/* opt out of function when */
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/* TX_NO_TIMER is defined, */
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/* resulting in version 6.1 */
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/* */
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/**************************************************************************/
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VOID _tx_thread_time_slice(VOID)
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{
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TX_INTERRUPT_SAVE_AREA
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TX_THREAD *thread_ptr;
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#ifdef TX_ENABLE_STACK_CHECKING
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TX_THREAD *next_thread_ptr;
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#endif
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#ifdef TX_ENABLE_EVENT_TRACE
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ULONG system_state;
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UINT preempt_disable;
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#endif
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/* Pickup thread pointer. */
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TX_THREAD_GET_CURRENT(thread_ptr)
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#ifdef TX_ENABLE_STACK_CHECKING
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/* Check this thread's stack. */
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TX_THREAD_STACK_CHECK(thread_ptr)
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/* Set the next thread pointer to NULL. */
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next_thread_ptr = TX_NULL;
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#endif
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/* Lockout interrupts while the time-slice is evaluated. */
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TX_DISABLE
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/* Clear the expired time-slice flag. */
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_tx_timer_expired_time_slice = TX_FALSE;
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/* Make sure the thread pointer is valid. */
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if (thread_ptr != TX_NULL)
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{
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/* Make sure the thread is still active, i.e. not suspended. */
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if (thread_ptr -> tx_thread_state == TX_READY)
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{
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/* Setup a fresh time-slice for the thread. */
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thread_ptr -> tx_thread_time_slice = thread_ptr -> tx_thread_new_time_slice;
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/* Reset the actual time-slice variable. */
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_tx_timer_time_slice = thread_ptr -> tx_thread_time_slice;
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/* Determine if there is another thread at the same priority and preemption-threshold
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is not set. Preemption-threshold overrides time-slicing. */
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if (thread_ptr -> tx_thread_ready_next != thread_ptr)
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{
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/* Check to see if preemption-threshold is not being used. */
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if (thread_ptr -> tx_thread_priority == thread_ptr -> tx_thread_preempt_threshold)
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{
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/* Preemption-threshold is not being used by this thread. */
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/* There is another thread at this priority, make it the highest at
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this priority level. */
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_tx_thread_priority_list[thread_ptr -> tx_thread_priority] = thread_ptr -> tx_thread_ready_next;
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/* Designate the highest priority thread as the one to execute. Don't use this
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thread's priority as an index just in case a higher priority thread is now
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ready! */
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_tx_thread_execute_ptr = _tx_thread_priority_list[_tx_thread_highest_priority];
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#ifdef TX_THREAD_ENABLE_PERFORMANCE_INFO
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/* Increment the thread's time-slice counter. */
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thread_ptr -> tx_thread_performance_time_slice_count++;
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/* Increment the total number of thread time-slice operations. */
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_tx_thread_performance_time_slice_count++;
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#endif
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#ifdef TX_ENABLE_STACK_CHECKING
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/* Pickup the next execute pointer. */
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next_thread_ptr = _tx_thread_execute_ptr;
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#endif
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}
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}
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}
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}
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#ifdef TX_ENABLE_EVENT_TRACE
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/* Pickup the volatile information. */
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system_state = TX_THREAD_GET_SYSTEM_STATE();
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preempt_disable = _tx_thread_preempt_disable;
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/* Insert this event into the trace buffer. */
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TX_TRACE_IN_LINE_INSERT(TX_TRACE_TIME_SLICE, _tx_thread_execute_ptr, system_state, preempt_disable, TX_POINTER_TO_ULONG_CONVERT(&thread_ptr), TX_TRACE_INTERNAL_EVENTS)
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#endif
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/* Restore previous interrupt posture. */
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TX_RESTORE
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#ifdef TX_ENABLE_STACK_CHECKING
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/* Determine if there is a next thread pointer to perform stack checking on. */
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if (next_thread_ptr != TX_NULL)
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{
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/* Yes, check this thread's stack. */
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TX_THREAD_STACK_CHECK(next_thread_ptr)
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}
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#endif
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}
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#endif
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