168 lines
6.8 KiB
C
168 lines
6.8 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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/** 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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#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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/**************************************************************************/
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/* */
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/* FUNCTION RELEASE */
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/* */
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/* _tx_thread_system_preempt_check PORTABLE SMP */
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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 checks for preemption that could have occurred as a */
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/* result scheduling activities occurring while the preempt disable */
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/* flag was set. */
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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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/* _tx_thread_system_return Return to the system */
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/* */
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/* CALLED BY */
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/* */
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/* Other ThreadX Components */
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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_thread_system_preempt_check(VOID)
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{
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TX_INTERRUPT_SAVE_AREA
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UINT core_index;
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UINT restore_needed;
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/* Disable interrupts. */
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TX_DISABLE
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/* Set the restore needed flag. */
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restore_needed = TX_TRUE;
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/* Pickup the index. */
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core_index = TX_SMP_CORE_ID;
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/* Determine if the call is from initialization, an ISR or if the preempt disable flag is set. */
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if (_tx_thread_system_state[core_index] == ((ULONG) 0))
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{
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/* Ensure the preempt disable flag is not set. */
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if (_tx_thread_preempt_disable == ((UINT) 0))
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{
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/* Thread execution - now determine if preemption should take place. */
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if (_tx_thread_current_ptr[core_index] != _tx_thread_execute_ptr[core_index])
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{
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/* Yes, thread preemption should take place. */
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#ifdef TX_ENABLE_STACK_CHECKING
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TX_THREAD *thread_ptr;
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/* Pickup the next execute pointer. */
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thread_ptr = _tx_thread_execute_ptr[core_index];
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/* Determine if there is a thread pointer. */
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if (thread_ptr != TX_NULL)
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{
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/* Check this thread's stack. */
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TX_THREAD_STACK_CHECK(thread_ptr)
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}
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#endif
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#ifdef TX_THREAD_ENABLE_PERFORMANCE_INFO
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/* Determine if an idle system return is present. */
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if (_tx_thread_execute_ptr[core_index] == TX_NULL)
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{
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/* Yes, increment the return to idle return count. */
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_tx_thread_performance_idle_return_count++;
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}
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else
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{
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/* No, there is another thread ready to run and will be scheduled upon return. */
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_tx_thread_performance_non_idle_return_count++;
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}
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#endif
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#ifndef TX_NOT_INTERRUPTABLE
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/* Increment the preempt disable flag in order to keep the protection. */
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_tx_thread_preempt_disable++;
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/* Restore interrupts. */
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TX_RESTORE
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#endif
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/* Return to the system so the higher priority thread can be scheduled. */
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_tx_thread_system_return();
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#ifdef TX_NOT_INTERRUPTABLE
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/* Restore interrupts. */
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TX_RESTORE
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#endif
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/* Clear the restore needed flag, since the interrupt poster/protection has been done. */
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restore_needed = TX_FALSE;
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}
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}
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}
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/* Determine if the protection still needs to be restored. */
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if (restore_needed == TX_TRUE)
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{
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/* Restore interrupts. */
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TX_RESTORE
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}
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}
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