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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** ThreadX Component */
/** */
/** Thread */
/** */
/**************************************************************************/
/**************************************************************************/
#define TX_SOURCE_CODE
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_thread.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _txe_thread_preemption_change PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks for errors in the preemption threshold change */
/* function call. */
/* */
/* INPUT */
/* */
/* thread_ptr Pointer to thread */
/* new_threshold New preemption threshold */
/* old_threshold Old preemption threshold */
/* */
/* OUTPUT */
/* */
/* TX_THREAD_ERROR Invalid thread pointer */
/* TX_PTR_ERROR Invalid old threshold pointer */
/* TX_CALLER_ERROR Invalid caller of function */
/* status Actual completion status */
/* */
/* CALLS */
/* */
/* _tx_thread_preemption_change Actual preempt change function*/
/* */
/* 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 */
/* */
/**************************************************************************/
UINT _txe_thread_preemption_change(TX_THREAD *thread_ptr, UINT new_threshold, UINT *old_threshold)
{
UINT status;
/* Check for an invalid thread pointer. */
if (thread_ptr == TX_NULL)
{
/* Thread pointer is invalid, return appropriate error code. */
status = TX_THREAD_ERROR;
}
/* Now check for invalid thread ID. */
else if (thread_ptr -> tx_thread_id != TX_THREAD_ID)
{
/* Thread pointer is invalid, return appropriate error code. */
status = TX_THREAD_ERROR;
}
/* Check for a valid old threshold pointer. */
else if (old_threshold == TX_NULL)
{
/* Invalid destination pointer, return appropriate error code. */
status = TX_PTR_ERROR;
}
/* Check for invalid caller of this function. */
else if (TX_THREAD_GET_SYSTEM_STATE() != ((ULONG) 0))
{
/* Invalid caller of this function, return appropriate error code. */
status = TX_CALLER_ERROR;
}
/* Determine if the preemption-threshold is valid. */
else if (new_threshold > thread_ptr -> tx_thread_user_priority)
{
/* Return an error status. */
status = TX_THRESH_ERROR;
}
else
{
/* Call actual change thread preemption function. */
status = _tx_thread_preemption_change(thread_ptr, new_threshold, old_threshold);
}
/* Return completion status. */
return(status);
}