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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
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_trace.h"
#include "tx_thread.h"
#ifndef TX_NO_TIMER
#include "tx_timer.h"
#endif
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_thread_relinquish PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function moves the currently executing thread to the end of */
/* the list of threads ready at the same priority. If no other threads */
/* of the same or higher priority are ready, this function simply */
/* returns. */
/* */
/* INPUT */
/* */
/* None */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _tx_thread_system_return Return to the system */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
VOID _tx_thread_relinquish(VOID)
{
TX_INTERRUPT_SAVE_AREA
UINT priority;
TX_THREAD *thread_ptr;
/* Pickup thread pointer. */
TX_THREAD_GET_CURRENT(thread_ptr)
#ifdef TX_ENABLE_STACK_CHECKING
/* Check this thread's stack. */
TX_THREAD_STACK_CHECK(thread_ptr)
#endif
/* Disable interrupts. */
TX_DISABLE
#ifndef TX_NO_TIMER
/* Reset time slice for current thread. */
_tx_timer_time_slice = thread_ptr -> tx_thread_new_time_slice;
#endif
/* Pickup the thread's priority. */
priority = thread_ptr -> tx_thread_priority;
/* Determine if there is another thread at the same priority. */
if (thread_ptr -> tx_thread_ready_next != thread_ptr)
{
/* Yes, there is another thread at this priority, make it the highest at
this priority level. */
_tx_thread_priority_list[priority] = thread_ptr -> tx_thread_ready_next;
/* Mark the new thread as the one to execute. */
_tx_thread_execute_ptr = thread_ptr -> tx_thread_ready_next;
}
/* Determine if there is a higher-priority thread ready. */
if (_tx_thread_highest_priority < priority)
{
/* Yes, there is a higher priority thread ready to execute. Make
it visible to the thread scheduler. */
_tx_thread_execute_ptr = _tx_thread_priority_list[_tx_thread_highest_priority];
/* No need to clear the preempted bit in this case, since the currently running
thread must already have its preempted bit clear. */
}
/* If trace is enabled, insert this event into the trace buffer. */
TX_TRACE_IN_LINE_INSERT(TX_TRACE_THREAD_RELINQUISH, &thread_ptr, TX_POINTER_TO_ULONG_CONVERT(_tx_thread_execute_ptr), 0, 0, TX_TRACE_THREAD_EVENTS)
/* Log this kernel call. */
TX_EL_THREAD_RELINQUISH_INSERT
/* Restore previous interrupt posture. */
TX_RESTORE
/* Determine if this thread needs to return to the system. */
if (_tx_thread_execute_ptr != thread_ptr)
{
#ifdef TX_THREAD_ENABLE_PERFORMANCE_INFO
/* Increment the number of thread relinquishes. */
thread_ptr -> tx_thread_performance_relinquish_count++;
/* Increment the total number of thread relinquish operations. */
_tx_thread_performance_relinquish_count++;
/* Increment the non-idle return count. */
_tx_thread_performance_non_idle_return_count++;
#endif
#ifdef TX_ENABLE_STACK_CHECKING
/* Pickup the next execute pointer. */
thread_ptr = _tx_thread_execute_ptr;
/* Check this thread's stack. */
TX_THREAD_STACK_CHECK(thread_ptr)
#endif
/* Transfer control to the system so the scheduler can execute
the next thread. */
_tx_thread_system_return();
}
}
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