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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** ThreadX Component */
/** */
/** Thread */
/** */
/**************************************************************************/
/**************************************************************************/
#define TX_SOURCE_CODE
#define TX_THREAD_SMP_SOURCE_CODE
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_thread.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_thread_system_preempt_check PORTABLE SMP */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks for preemption that could have occurred as a */
/* result scheduling activities occurring while the preempt disable */
/* flag was set. */
/* */
/* INPUT */
/* */
/* None */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _tx_thread_system_return Return to the system */
/* */
/* CALLED BY */
/* */
/* Other ThreadX Components */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 09-30-2020 William E. Lamie Initial Version 6.1 */
/* */
/**************************************************************************/
VOID _tx_thread_system_preempt_check(VOID)
{
TX_INTERRUPT_SAVE_AREA
UINT core_index;
UINT restore_needed;
/* Disable interrupts. */
TX_DISABLE
/* Set the restore needed flag. */
restore_needed = TX_TRUE;
/* Pickup the index. */
core_index = TX_SMP_CORE_ID;
/* Determine if the call is from initialization, an ISR or if the preempt disable flag is set. */
if (_tx_thread_system_state[core_index] == ((ULONG) 0))
{
/* Ensure the preempt disable flag is not set. */
if (_tx_thread_preempt_disable == ((UINT) 0))
{
/* Thread execution - now determine if preemption should take place. */
if (_tx_thread_current_ptr[core_index] != _tx_thread_execute_ptr[core_index])
{
/* Yes, thread preemption should take place. */
#ifdef TX_ENABLE_STACK_CHECKING
TX_THREAD *thread_ptr;
/* Pickup the next execute pointer. */
thread_ptr = _tx_thread_execute_ptr[core_index];
/* Determine if there is a thread pointer. */
if (thread_ptr != TX_NULL)
{
/* Check this thread's stack. */
TX_THREAD_STACK_CHECK(thread_ptr)
}
#endif
#ifdef TX_THREAD_ENABLE_PERFORMANCE_INFO
/* Determine if an idle system return is present. */
if (_tx_thread_execute_ptr[core_index] == TX_NULL)
{
/* Yes, increment the return to idle return count. */
_tx_thread_performance_idle_return_count++;
}
else
{
/* No, there is another thread ready to run and will be scheduled upon return. */
_tx_thread_performance_non_idle_return_count++;
}
#endif
#ifndef TX_NOT_INTERRUPTABLE
/* Increment the preempt disable flag in order to keep the protection. */
_tx_thread_preempt_disable++;
/* Restore interrupts. */
TX_RESTORE
#endif
/* Return to the system so the higher priority thread can be scheduled. */
_tx_thread_system_return();
#ifdef TX_NOT_INTERRUPTABLE
/* Restore interrupts. */
TX_RESTORE
#endif
/* Clear the restore needed flag, since the interrupt poster/protection has been done. */
restore_needed = TX_FALSE;
}
}
}
/* Determine if the protection still needs to be restored. */
if (restore_needed == TX_TRUE)
{
/* Restore interrupts. */
TX_RESTORE
}
}
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