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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* 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"
#include "tx_timer.h"
extern sem_t _tx_linux_isr_semaphore;
UINT _tx_linux_timer_waiting = 0;
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_thread_context_restore SMP/Linux/GCC */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function restores the interrupt context if it is processing a */
/* nested interrupt. If not, it returns to the interrupt thread if no */
/* preemption is necessary. Otherwise, if preemption is necessary or */
/* if no thread was running, the function returns to the scheduler. */
/* */
/* INPUT */
/* */
/* None */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _tx_linux_debug_entry_insert */
/* _tx_linux_mutex_obtain */
/* sem_trywait */
/* tx_linux_sem_post */
/* tx_linux_sem_wait */
/* _tx_linux_thread_resume */
/* _tx_linux_mutex_release_all */
/* */
/* CALLED BY */
/* */
/* ISRs Interrupt Service Routines */
/* */
/**************************************************************************/
VOID _tx_thread_context_restore(VOID)
{
TX_THREAD *current_thread;
/* The critical section is already in force at this point. */
/* Debug entry. */
_tx_linux_debug_entry_insert("CONTEXT_RESTORE", __FILE__, __LINE__);
/* For Linux, ISRs are always mapped to core 0. */
/* Decrement the nested interrupt count. */
_tx_thread_system_state[0]--;
/* Pickup current thread. */
current_thread = _tx_thread_current_ptr[0];
/* Determine if this is the first nested interrupt and if a ThreadX
application thread was running at the time. */
if ((!_tx_thread_system_state[0]) && (current_thread))
{
/* Yes, this is the first and last interrupt processed. */
/* Check to see if preemption is required. */
if ((_tx_thread_preempt_disable == 0) && (current_thread != _tx_thread_execute_ptr[0]))
{
/* Preempt the running application thread. We don't need to suspend the
application thread since that is done in the context save processing. */
/* Indicate that this thread was suspended asynchronously. */
current_thread -> tx_thread_linux_suspension_type = 1;
/* Save the remaining time-slice and disable it. */
if (_tx_timer_time_slice[0])
{
current_thread -> tx_thread_time_slice = _tx_timer_time_slice[0];
_tx_timer_time_slice[0] = 0;
}
/* Clear the current thread pointer. */
_tx_thread_current_ptr[0] = TX_NULL;
/* Clear this mapping entry. */
_tx_linux_virtual_cores[0].tx_thread_smp_core_mapping_thread = TX_NULL;
_tx_linux_virtual_cores[0].tx_thread_smp_core_mapping_linux_thread_id = 0;
/* Indicate that this thread is now ready for scheduling again by another core. */
current_thread -> tx_thread_smp_core_control = 1;
/* Make sure semaphore is 0. */
while(!sem_trywait(&_tx_linux_scheduler_semaphore));
/* Indicate it is in timer ISR. */
_tx_linux_timer_waiting = 1;
/* Wakeup the system thread by setting the system semaphore. */
tx_linux_sem_post(&_tx_linux_scheduler_semaphore);
if(_tx_thread_execute_ptr[0])
{
if(_tx_thread_execute_ptr[0] -> tx_thread_linux_suspension_type == 2)
{
/* Unlock linux mutex. */
_tx_linux_mutex_release_all(&_tx_linux_mutex);
/* Wait until TX_THREAD start running. */
tx_linux_sem_wait(&_tx_linux_isr_semaphore);
_tx_linux_mutex_obtain(&_tx_linux_mutex);
/* Make sure semaphore is 0. */
while(!sem_trywait(&_tx_linux_isr_semaphore));
}
}
/* Indicate it is not in timer ISR. */
_tx_linux_timer_waiting = 0;
}
else
{
/* Since preemption is not required, resume the interrupted thread. */
_tx_linux_thread_resume(current_thread -> tx_thread_linux_thread_id);
}
}
/* Unlock linux mutex. */
_tx_thread_smp_unprotect(TX_INT_ENABLE);
}
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