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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
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_thread.h"
#include "tx_timer.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_thread_context_save Win32/Visual */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function saves the context of an executing thread in the */
/* beginning of interrupt processing. The function also ensures that */
/* the system stack is used upon return to the calling ISR. */
/* */
/* INPUT */
/* */
/* None */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* SuspendThread Win32 thread suspend */
/* _tx_win32_critical_section_obtain Obtain critical section */
/* _tx_win32_critical_section_release Release critical section */
/* */
/* CALLED BY */
/* */
/* ISRs */
/* */
/**************************************************************************/
VOID _tx_thread_context_save(VOID)
{
TX_THREAD *thread_ptr;
/* Enter critical section to ensure other threads are not playing with
the core ThreadX data structures. */
_tx_win32_critical_section_obtain(&_tx_win32_critical_section);
/* Debug entry. */
_tx_win32_debug_entry_insert("CONTEXT_SAVE", __FILE__, __LINE__);
/* Pickup the current thread pointer. */
thread_ptr = _tx_thread_current_ptr;
/* If an application thread is running, suspend it to simulate preemption. */
if ((thread_ptr) && (_tx_thread_system_state == 0))
{
/* Yes, this is the first interrupt and an application thread is running...
suspend it! */
/* Suspend the thread to simulate preemption. Note that the thread is suspended BEFORE the protection get
flag is checked to ensure there is not a race condition between this thread and the update of that flag. */
SuspendThread(thread_ptr -> tx_thread_win32_thread_handle);
/* Debug entry. */
_tx_win32_debug_entry_insert("CONTEXT_SAVE-suspend_thread", __FILE__, __LINE__);
}
/* Increment the nested interrupt condition. */
_tx_thread_system_state++;
/* Exit Win32 critical section. */
_tx_win32_critical_section_release(&_tx_win32_critical_section);
}
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