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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_schedule Win32/Visual */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function waits for a thread control block pointer to appear in */
/* the _tx_thread_execute_ptr variable. Once a thread pointer appears */
/* in the variable, the corresponding thread is resumed. */
/* */
/* INPUT */
/* */
/* None */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* ReleaseSemaphore Win32 release semaphore */
/* ResumeThread Win32 resume thread */
/* Sleep Win32 thread sleep */
/* WaitForSingleObject Win32 wait on a semaphore */
/* _tx_win32_critical_section_obtain Obtain critical section */
/* _tx_win32_critical_section_release Release critical section */
/* */
/* CALLED BY */
/* */
/* _tx_initialize_kernel_enter ThreadX entry function */
/* */
/**************************************************************************/
VOID _tx_thread_schedule(VOID)
{
/* Loop forever. */
while(1)
{
/* Wait for a thread to execute and all ISRs to complete. */
while(1)
{
/* Enter Win32 critical section. */
_tx_win32_critical_section_obtain(&_tx_win32_critical_section);
/* Debug entry. */
_tx_win32_debug_entry_insert("SCHEDULE-wake_up", __FILE__, __LINE__);
/* Determine if there is a thread ready to execute AND all ISRs
are complete. */
if ((_tx_thread_execute_ptr != TX_NULL) && (_tx_thread_system_state == 0))
{
/* Get out of this loop and schedule the thread! */
break;
}
else
{
/* Leave the critical section. */
_tx_win32_critical_section_release(&_tx_win32_critical_section);
/* Now sleep so we don't block forever. */
Sleep(2);
}
}
/* Yes! We have a thread to execute. Note that the critical section is already
active from the scheduling loop above. */
/* Setup the current thread pointer. */
_tx_thread_current_ptr = _tx_thread_execute_ptr;
/* Increment the run count for this thread. */
_tx_thread_current_ptr -> tx_thread_run_count++;
/* Setup time-slice, if present. */
_tx_timer_time_slice = _tx_thread_current_ptr -> tx_thread_time_slice;
/* Determine how the thread was suspended. */
if (_tx_thread_current_ptr -> tx_thread_win32_suspension_type)
{
/* Debug entry. */
_tx_win32_debug_entry_insert("SCHEDULE-resume_thread", __FILE__, __LINE__);
/* Pseudo interrupt suspension. The thread is not waiting on
its run semaphore. */
ResumeThread(_tx_thread_current_ptr -> tx_thread_win32_thread_handle);
}
else
{
/* Debug entry. */
_tx_win32_debug_entry_insert("SCHEDULE-release_sem", __FILE__, __LINE__);
/* Let the thread run again by releasing its run semaphore. */
ReleaseSemaphore(_tx_thread_current_ptr -> tx_thread_win32_thread_run_semaphore, 1, NULL);
}
/* Debug entry. */
_tx_win32_debug_entry_insert("SCHEDULE-self_suspend_sem", __FILE__, __LINE__);
/* Exit Win32 critical section. */
_tx_win32_critical_section_release(&_tx_win32_critical_section);
/* Now suspend the main thread so the application thread can run. */
WaitForSingleObject(_tx_win32_scheduler_semaphore, INFINITE);
}
}
/* Define the ThreadX Win32 critical section get, release, and release all functions. */
void _tx_win32_critical_section_obtain(TX_WIN32_CRITICAL_SECTION *critical_section)
{
TX_THREAD *thread_ptr;
/* Is the protection owned? */
if (critical_section -> tx_win32_critical_section_owner == GetCurrentThreadId())
{
/* Simply increment the nested counter. */
critical_section -> tx_win32_critical_section_nested_count++;
}
else
{
/* Pickup the current thread pointer. */
thread_ptr = _tx_thread_current_ptr;
/* Get the Win32 critical section. */
while (WaitForSingleObject(critical_section -> tx_win32_critical_section_mutex_handle, 3) != WAIT_OBJECT_0)
{
}
/* At this point we have the mutex. */
/* Increment the nesting counter. */
critical_section -> tx_win32_critical_section_nested_count = 1;
/* Remember the owner. */
critical_section -> tx_win32_critical_section_owner = GetCurrentThreadId();
}
}
void _tx_win32_critical_section_release(TX_WIN32_CRITICAL_SECTION *critical_section)
{
/* Ensure the caller is the mutex owner. */
if (critical_section -> tx_win32_critical_section_owner == GetCurrentThreadId())
{
/* Determine if there is protection. */
if (critical_section -> tx_win32_critical_section_nested_count)
{
/* Decrement the nesting counter. */
critical_section -> tx_win32_critical_section_nested_count--;
/* Determine if the critical section is now being released. */
if (critical_section -> tx_win32_critical_section_nested_count == 0)
{
/* Yes, it is being released clear the owner. */
critical_section -> tx_win32_critical_section_owner = 0;
/* Finally, release the mutex. */
if (ReleaseMutex(critical_section -> tx_win32_critical_section_mutex_handle) != TX_TRUE)
{
/* Increment the system error counter. */
_tx_win32_system_error++;
}
/* Just in case, make sure there the mutex is not owned. */
while (ReleaseMutex(critical_section -> tx_win32_critical_section_mutex_handle) == TX_TRUE)
{
/* Increment the system error counter. */
_tx_win32_system_error++;
}
/* Sleep for 0, just to relinquish to other ready threads. */
Sleep(0);
}
}
}
else
{
/* Increment the system error counter. */
_tx_win32_system_error++;
}
}
void _tx_win32_critical_section_release_all(TX_WIN32_CRITICAL_SECTION *critical_section)
{
/* Ensure the caller is the mutex owner. */
if (critical_section -> tx_win32_critical_section_owner == GetCurrentThreadId())
{
/* Determine if there is protection. */
if (critical_section -> tx_win32_critical_section_nested_count)
{
/* Clear the nesting counter. */
critical_section -> tx_win32_critical_section_nested_count = 0;
/* Yes, it is being release clear the owner. */
critical_section -> tx_win32_critical_section_owner = 0;
/* Finally, release the mutex. */
if (ReleaseMutex(critical_section -> tx_win32_critical_section_mutex_handle) != TX_TRUE)
{
/* Increment the system error counter. */
_tx_win32_system_error++;
}
/* Just in case, make sure there the mutex is not owned. */
while (ReleaseMutex(critical_section -> tx_win32_critical_section_mutex_handle) == TX_TRUE)
{
/* Increment the system error counter. */
_tx_win32_system_error++;
}
}
}
else
{
/* Increment the system error counter. */
_tx_win32_system_error++;
}
}
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