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/***************************************************************************
* Copyright (C) 2026 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.
*
* AI Disclosure: This file was largely AI-generated by Codex (gpt 5.4).
* The AI-generated portions may be considered public domain (CC0-1.0)
* and not subject to the project's licence. The human contributor has
* reviewed and verified that the code is correct.
*
* SPDX-License-Identifier: MIT and CC0-1.0
**************************************************************************/
// Some portions generated by Codex (gpt 5.4).
// Some portions generated by GitHub Copilot (claude-sonnet-4.6).
#define TX_SOURCE_CODE
#define TX_THREAD_SMP_SOURCE_CODE
#include "tx_api.h"
#include "tx_thread.h"
#include "tx_timer.h"
VOID _tx_thread_context_save(VOID)
{
TX_THREAD *thread_ptr;
UINT interrupt_posture;
interrupt_posture = _tx_thread_smp_protect();
if (interrupt_posture != TX_FALSE)
{
_tx_win32_system_error++;
}
_tx_win32_debug_entry_insert("CONTEXT_SAVE", __FILE__, __LINE__);
thread_ptr = _tx_thread_current_ptr[0];
if ((thread_ptr != TX_NULL) && (_tx_thread_system_state[0] == 0UL))
{
if (thread_ptr -> tx_thread_win32_mutex_access == TX_FALSE)
{
if (_tx_thread_preempt_disable == 0U)
{
/* Thread is not in a preempt-disabled section; suspend it normally so
* context_restore can preempt it if a higher-priority thread is ready. */
_tx_win32_thread_suspend(thread_ptr -> tx_thread_win32_thread_handle);
_tx_win32_debug_entry_insert("CONTEXT_SAVE-suspend_thread", __FILE__, __LINE__);
}
else
{
/* Thread holds the SMP preemption lock (_tx_thread_preempt_disable != 0).
* Issuing SuspendThread/ResumeThread here would cost ~100 µs for zero
* benefit: context_restore will skip preemption anyway because
* _tx_thread_preempt_disable is still non-zero when it runs (the ISR
* cannot lower the count below its value at ISR entry while it holds the
* Win32 critical section). Flag the thread so context_restore knows not
* to issue a matching ResumeThread.
*
* MISRA C 2012 Rule 10.3 deviation: suspension_type is a UINT field used
* as a small state tag; value 3 is a port-local extension of the existing
* 0/1/2 enumeration. */
thread_ptr -> tx_thread_win32_suspension_type = 3U;
}
}
else
{
/* Thread is spinning on the Win32 critical section (mutex_access TRUE).
* It is blocked waiting to acquire the CS and cannot execute any protected
* ThreadX code, so SuspendThread is unnecessary. Tag the thread with
* suspension_type 4 so context_restore handles it correctly:
* - no-preemption path: just clear the flag (no ResumeThread).
* - preemption path: call SuspendThread retrospectively and proceed.
*
* MISRA C 2012 Rule 10.3 deviation: value 4 is a port-local extension. */
thread_ptr -> tx_thread_win32_suspension_type = 4U;
}
}
_tx_thread_system_state[0]++;
}
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