add SMP, Modules, and more processor/tools releases
This commit is contained in:
Scott Larson
487
common_smp/src/tx_mutex_priority_change.c
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487
common_smp/src/tx_mutex_priority_change.c
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/**************************************************************************/
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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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/** Mutex */
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/** */
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/**************************************************************************/
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/**************************************************************************/
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#define TX_SOURCE_CODE
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#define TX_THREAD_SMP_SOURCE_CODE
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/* Include necessary system files. */
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#include "tx_api.h"
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#include "tx_thread.h"
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#include "tx_mutex.h"
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/**************************************************************************/
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/* */
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/* FUNCTION RELEASE */
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/* */
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/* _tx_mutex_priority_change PORTABLE SMP */
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/* 6.0.1 */
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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 changes the priority of the specified thread for the */
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/* priority inheritance option of the mutex service. */
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/* */
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/* INPUT */
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/* */
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/* thread_ptr Pointer to thread to suspend */
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/* new_priority New thread priority */
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/* new_threshold New preemption-threshold */
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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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/* _tx_thread_smp_rebalance_execute_list */
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/* Rebalance the execution list */
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/* _tx_thread_smp_simple_priority_change */
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/* Change priority */
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/* _tx_thread_system_resume Resume thread */
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/* _tx_thread_system_ni_resume Non-interruptable resume thread */
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/* _tx_thread_system_suspend Suspend thread */
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/* _tx_thread_system_ni_suspend Non-interruptable suspend thread */
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/* */
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/* CALLED BY */
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/* */
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/* _tx_mutex_get Inherit priority */
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/* _tx_mutex_put Restore previous priority */
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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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/* 06-30-2020 William E. Lamie Initial Version 6.0.1 */
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/* */
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/**************************************************************************/
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VOID _tx_mutex_priority_change(TX_THREAD *thread_ptr, UINT new_priority)
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{
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#ifndef TX_NOT_INTERRUPTABLE
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TX_INTERRUPT_SAVE_AREA
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#endif
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TX_THREAD *execute_ptr;
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UINT core_index;
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UINT original_priority;
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UINT lowest_priority;
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TX_THREAD *original_pt_thread;
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#ifndef TX_DISABLE_PREEMPTION_THRESHOLD
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TX_THREAD *new_pt_thread;
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UINT priority;
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ULONG priority_bit;
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#if TX_MAX_PRIORITIES > 32
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UINT map_index;
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#endif
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#endif
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UINT finished;
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/* Default finished to false. */
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finished = TX_FALSE;
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#ifndef TX_NOT_INTERRUPTABLE
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/* Lockout interrupts while the thread is being suspended. */
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TX_DISABLE
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#endif
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/* Determine if there is anything to do. */
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if (thread_ptr -> tx_thread_priority == new_priority)
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{
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if (thread_ptr -> tx_thread_preempt_threshold == new_priority)
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{
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/* Set the finished flag to true. */
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finished = TX_TRUE;
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}
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}
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/* Determine if there is still more to do. */
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if (finished == TX_FALSE)
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{
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/* Default the execute pointer to NULL. */
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execute_ptr = TX_NULL;
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/* Determine if this thread is currently ready. */
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if (thread_ptr -> tx_thread_state != TX_READY)
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{
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/* Change thread priority to the new mutex priority-inheritance priority. */
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thread_ptr -> tx_thread_priority = new_priority;
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/* Determine how to setup the thread's preemption-threshold. */
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if (thread_ptr -> tx_thread_user_preempt_threshold < new_priority)
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{
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/* Change thread preemption-threshold to the user's preemption-threshold. */
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thread_ptr -> tx_thread_preempt_threshold = thread_ptr -> tx_thread_user_preempt_threshold;
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}
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else
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{
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/* Change the thread preemption-threshold to the new threshold. */
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thread_ptr -> tx_thread_preempt_threshold = new_priority;
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}
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}
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else
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{
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/* Pickup the core index. */
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core_index = thread_ptr -> tx_thread_smp_core_mapped;
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/* Save the original priority. */
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original_priority = thread_ptr -> tx_thread_priority;
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/* Determine if this thread is the currently executing thread. */
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if (thread_ptr == _tx_thread_execute_ptr[core_index])
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{
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/* Yes, this thread is scheduled. */
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/* Remember this thread as the currently executing thread. */
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execute_ptr = thread_ptr;
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/* Determine if the thread is being set to a higher-priority and it does't have
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preemption-threshold set. */
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if (new_priority < thread_ptr -> tx_thread_priority)
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{
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/* Check for preemption-threshold. */
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if (thread_ptr -> tx_thread_user_priority == thread_ptr -> tx_thread_user_preempt_threshold)
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{
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/* Simple case, remove the thread from the current priority list and place in
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the higher priority list. */
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_tx_thread_smp_simple_priority_change(thread_ptr, new_priority);
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/* Set the finished flag to true. */
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finished = TX_TRUE;
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}
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}
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}
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else
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{
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/* Thread is not currently executing, so it can just be moved to the lower priority in the list. */
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/* Determine if the thread is being set to a lower-priority and it does't have
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preemption-threshold set. */
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if (new_priority > thread_ptr -> tx_thread_priority)
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{
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/* Check for preemption-threshold. */
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if (thread_ptr -> tx_thread_user_priority == thread_ptr -> tx_thread_user_preempt_threshold)
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{
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/* Simple case, remove the thread from the current priority list and place in
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the lower priority list. */
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if (new_priority < thread_ptr -> tx_thread_user_priority)
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{
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/* Use the new priority. */
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_tx_thread_smp_simple_priority_change(thread_ptr, new_priority);
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}
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else
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{
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/* Use the user priority. */
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_tx_thread_smp_simple_priority_change(thread_ptr, thread_ptr -> tx_thread_user_priority);
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}
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/* Set the finished flag to true. */
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finished = TX_TRUE;
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}
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}
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}
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/* Now determine if we are finished. */
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if (finished == TX_FALSE)
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{
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/* Save the original preemption-threshold thread. */
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original_pt_thread = _tx_thread_preemption__threshold_scheduled;
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#ifdef TX_NOT_INTERRUPTABLE
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/* Increment the preempt disable flag. */
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_tx_thread_preempt_disable++;
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/* Set the state to suspended. */
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thread_ptr -> tx_thread_state = TX_SUSPENDED;
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/* Call actual non-interruptable thread suspension routine. */
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_tx_thread_system_ni_suspend(thread_ptr, ((ULONG) 0));
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/* At this point, the preempt disable flag is still set, so we still have
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protection against all preemption. */
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/* Determine how to setup the thread's priority. */
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if (thread_ptr -> tx_thread_user_priority < new_priority)
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{
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/* Change thread priority to the user's priority. */
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thread_ptr -> tx_thread_priority = thread_ptr -> tx_thread_user_priority;
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}
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else
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{
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/* Change thread priority to the new mutex priority-inheritance priority. */
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thread_ptr -> tx_thread_priority = new_priority;
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}
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/* Determine how to setup the thread's preemption-threshold. */
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if (thread_ptr -> tx_thread_user_preempt_threshold < new_priority)
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{
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/* Change thread preemption-threshold to the user's preemption-threshold. */
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thread_ptr -> tx_thread_preempt_threshold = thread_ptr -> tx_thread_user_preempt_threshold;
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}
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else
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{
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/* Change the thread preemption-threshold to the new threshold. */
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thread_ptr -> tx_thread_preempt_threshold = new_priority;
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}
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/* Resume the thread with the new priority. */
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_tx_thread_system_ni_resume(thread_ptr);
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/* Decrement the preempt disable flag. */
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_tx_thread_preempt_disable--;
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#else
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/* Increment the preempt disable flag. */
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_tx_thread_preempt_disable = _tx_thread_preempt_disable + ((UINT) 2);
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/* Set the state to suspended. */
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thread_ptr -> tx_thread_state = TX_SUSPENDED;
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/* Set the suspending flag. */
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thread_ptr -> tx_thread_suspending = TX_TRUE;
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/* Setup the timeout period. */
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thread_ptr -> tx_thread_timer.tx_timer_internal_remaining_ticks = ((UINT) 0);
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/* Restore interrupts. */
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TX_RESTORE
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/* The thread is ready and must first be removed from the list. Call the
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system suspend function to accomplish this. */
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_tx_thread_system_suspend(thread_ptr);
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/* Lockout interrupts again. */
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TX_DISABLE
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/* At this point, the preempt disable flag is still set, so we still have
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protection against all preemption. */
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/* Determine how to setup the thread's priority. */
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if (thread_ptr -> tx_thread_user_priority < new_priority)
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{
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/* Change thread priority to the user's priority. */
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thread_ptr -> tx_thread_priority = thread_ptr -> tx_thread_user_priority;
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}
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else
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{
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/* Change thread priority to the new mutex priority-inheritance priority. */
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thread_ptr -> tx_thread_priority = new_priority;
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}
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/* Determine how to setup the thread's preemption-threshold. */
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if (thread_ptr -> tx_thread_user_preempt_threshold < new_priority)
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{
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/* Change thread preemption-threshold to the user's preemption-threshold. */
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thread_ptr -> tx_thread_preempt_threshold = thread_ptr -> tx_thread_user_preempt_threshold;
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}
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else
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{
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/* Change the thread preemption-threshold to the new threshold. */
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thread_ptr -> tx_thread_preempt_threshold = new_priority;
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}
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/* Restore interrupts. */
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TX_RESTORE
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/* Resume the thread with the new priority. */
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_tx_thread_system_resume(thread_ptr);
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#endif
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/* Optional processing extension. */
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TX_MUTEX_PRIORITY_CHANGE_EXTENSION
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#ifndef TX_NOT_INTERRUPTABLE
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/* Disable interrupts. */
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TX_DISABLE
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#endif
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/* Determine if the thread was previously executing. */
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if (thread_ptr == execute_ptr)
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{
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#ifndef TX_DISABLE_PREEMPTION_THRESHOLD
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/* Determine if preemption-threshold is in force at the new priority level. */
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if (_tx_thread_preemption_threshold_list[thread_ptr -> tx_thread_priority] == TX_NULL)
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{
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/* Ensure that this thread is placed at the front of the priority list. */
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_tx_thread_priority_list[thread_ptr -> tx_thread_priority] = thread_ptr;
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}
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#else
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/* Ensure that this thread is placed at the front of the priority list. */
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_tx_thread_priority_list[thread_ptr -> tx_thread_priority] = thread_ptr;
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#endif
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}
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/* Pickup the core index. */
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core_index = thread_ptr -> tx_thread_smp_core_mapped;
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#ifndef TX_THREAD_SMP_DYNAMIC_CORE_MAX
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/* Pickup the next thread to execute. */
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if (core_index < ((UINT) TX_THREAD_SMP_MAX_CORES))
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#else
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/* Pickup the next thread to execute. */
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if (core_index < _tx_thread_smp_max_cores)
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#endif
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{
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/* Determine if this thread is not the next thread to execute. */
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if (thread_ptr != _tx_thread_execute_ptr[core_index])
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{
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/* Now determine if this thread was previously executing thread. */
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if (thread_ptr == execute_ptr)
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{
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/* Determine if we moved to a lower priority. If so, move the thread to the front of the priority list. */
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if (original_priority < new_priority)
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{
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/* Make sure the thread is still ready. */
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if (thread_ptr -> tx_thread_state == TX_READY)
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{
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/* Determine the lowest priority scheduled thread. */
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lowest_priority = _tx_thread_smp_lowest_priority_get();
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/* Determine if this thread has a higher or same priority as the lowest priority
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in the list. */
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if (thread_ptr -> tx_thread_priority <= lowest_priority)
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{
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/* Yes, we need to rebalance to make it possible for this thread to execute. */
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/* Determine if the thread with preemption-threshold thread has changed... and is
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not the scheduled thread. */
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if ((original_pt_thread != _tx_thread_preemption__threshold_scheduled) &&
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(original_pt_thread != thread_ptr))
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{
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/* Yes, preemption-threshold has changed. Determine if it can or should
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be reversed. */
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#ifndef TX_DISABLE_PREEMPTION_THRESHOLD
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/* Pickup the preemption-threshold thread. */
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new_pt_thread = _tx_thread_preemption__threshold_scheduled;
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#endif
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/* Restore the original preemption-threshold thread. */
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_tx_thread_preemption__threshold_scheduled = original_pt_thread;
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#ifndef TX_DISABLE_PREEMPTION_THRESHOLD
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/* Determine if there is a new preemption-threshold thread to reverse. */
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if (new_pt_thread != TX_NULL)
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{
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/* Clear the information associated with the new preemption-threshold thread. */
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/* Pickup the priority. */
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priority = new_pt_thread -> tx_thread_priority;
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/* Clear the preempted list entry. */
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_tx_thread_preemption_threshold_list[priority] = TX_NULL;
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#if TX_MAX_PRIORITIES > 32
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/* Calculate the bit map array index. */
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map_index = new_priority/((UINT) 32);
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#endif
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/* Ensure that this thread's priority is clear in the preempt map. */
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TX_MOD32_BIT_SET(priority, priority_bit)
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_tx_thread_preempted_maps[MAP_INDEX] = _tx_thread_preempted_maps[MAP_INDEX] & (~(priority_bit));
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#if TX_MAX_PRIORITIES > 32
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/* Determine if there are any other bits set in this preempt map. */
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if (_tx_thread_preempted_maps[MAP_INDEX] == ((ULONG) 0))
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{
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/* No, clear the active bit to signify this preempted map has nothing set. */
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TX_DIV32_BIT_SET(priority, priority_bit)
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_tx_thread_preempted_map_active = _tx_thread_preempted_map_active & (~(priority_bit));
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}
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#endif
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}
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#endif
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}
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/* Pickup the index. */
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core_index = TX_SMP_CORE_ID;
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/* Call the rebalance routine. This routine maps cores and ready threads. */
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_tx_thread_smp_rebalance_execute_list(core_index);
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}
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}
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}
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}
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}
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}
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}
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}
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}
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#ifndef TX_NOT_INTERRUPTABLE
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/* Restore interrupts. */
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TX_RESTORE
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#endif
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}
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