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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_initialize.h"
#include "tx_thread.h"
#include "tx_timer.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _txe_thread_create PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks for errors in the thread create function call. */
/* */
/* INPUT */
/* */
/* thread_ptr Thread control block pointer */
/* name Pointer to thread name string */
/* entry_function Entry function of the thread */
/* entry_input 32-bit input value to thread */
/* stack_start Pointer to start of stack */
/* stack_size Stack size in bytes */
/* priority Priority of thread (0-31) */
/* preempt_threshold Preemption threshold */
/* time_slice Thread time-slice value */
/* auto_start Automatic start selection */
/* thread_control_block_size Size of thread control block */
/* */
/* OUTPUT */
/* */
/* TX_THREAD_ERROR Invalid thread pointer */
/* TX_PTR_ERROR Invalid entry point or stack */
/* address */
/* TX_SIZE_ERROR Invalid stack size -too small */
/* TX_PRIORITY_ERROR Invalid thread priority */
/* TX_THRESH_ERROR Invalid preemption threshold */
/* status Actual completion status */
/* */
/* CALLS */
/* */
/* _tx_thread_create Actual thread create function */
/* _tx_thread_system_preempt_check Check for preemption */
/* */
/* 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_create(TX_THREAD *thread_ptr, CHAR *name_ptr,
VOID (*entry_function)(ULONG id), ULONG entry_input,
VOID *stack_start, ULONG stack_size,
UINT priority, UINT preempt_threshold,
ULONG time_slice, UINT auto_start, UINT thread_control_block_size)
{
TX_INTERRUPT_SAVE_AREA
UINT status;
UINT break_flag;
ULONG i;
TX_THREAD *next_thread;
VOID *stack_end;
UCHAR *work_ptr;
#ifndef TX_TIMER_PROCESS_IN_ISR
TX_THREAD *current_thread;
#endif
/* Default status to success. */
status = TX_SUCCESS;
/* 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 control block size. */
else if (thread_control_block_size != (sizeof(TX_THREAD)))
{
/* Thread pointer is invalid, return appropriate error code. */
status = TX_THREAD_ERROR;
}
else
{
/* Disable interrupts. */
TX_DISABLE
/* Increment the preempt disable flag. */
_tx_thread_preempt_disable++;
/* Restore interrupts. */
TX_RESTORE
/* Next see if it is already in the created list. */
break_flag = TX_FALSE;
next_thread = _tx_thread_created_ptr;
work_ptr = TX_VOID_TO_UCHAR_POINTER_CONVERT(stack_start);
work_ptr = TX_UCHAR_POINTER_ADD(work_ptr, (stack_size - ((ULONG) 1)));
stack_end = TX_UCHAR_TO_VOID_POINTER_CONVERT(work_ptr);
for (i = ((ULONG) 0); i < _tx_thread_created_count; i++)
{
/* Determine if this thread matches the thread in the list. */
if (thread_ptr == next_thread)
{
/* Set the break flag. */
break_flag = TX_TRUE;
}
/* Determine if we need to break the loop. */
if (break_flag == TX_TRUE)
{
/* Yes, break out of the loop. */
break;
}
/* Check the stack pointer to see if it overlaps with this thread's stack. */
if (stack_start >= next_thread -> tx_thread_stack_start)
{
if (stack_start < next_thread -> tx_thread_stack_end)
{
/* This stack overlaps with an existing thread, clear the stack pointer to
force a stack error below. */
stack_start = TX_NULL;
/* Set the break flag. */
break_flag = TX_TRUE;
}
}
/* Check the end of the stack to see if it is inside this thread's stack area as well. */
if (stack_end >= next_thread -> tx_thread_stack_start)
{
if (stack_end < next_thread -> tx_thread_stack_end)
{
/* This stack overlaps with an existing thread, clear the stack pointer to
force a stack error below. */
stack_start = TX_NULL;
/* Set the break flag. */
break_flag = TX_TRUE;
}
}
/* Move to the next thread. */
next_thread = next_thread -> tx_thread_created_next;
}
/* Disable interrupts. */
TX_DISABLE
/* Decrement the preempt disable flag. */
_tx_thread_preempt_disable--;
/* Restore interrupts. */
TX_RESTORE
/* Check for preemption. */
_tx_thread_system_preempt_check();
/* At this point, check to see if there is a duplicate thread. */
if (thread_ptr == next_thread)
{
/* Thread is already created, return appropriate error code. */
status = TX_THREAD_ERROR;
}
/* Check for invalid starting address of stack. */
else if (stack_start == TX_NULL)
{
/* Invalid stack or entry point, return appropriate error code. */
status = TX_PTR_ERROR;
}
/* Check for invalid thread entry point. */
else if (entry_function == TX_NULL)
{
/* Invalid stack or entry point, return appropriate error code. */
status = TX_PTR_ERROR;
}
/* Check the stack size. */
else if (stack_size < ((ULONG) TX_MINIMUM_STACK))
{
/* Stack is not big enough, return appropriate error code. */
status = TX_SIZE_ERROR;
}
/* Check the priority specified. */
else if (priority >= ((UINT) TX_MAX_PRIORITIES))
{
/* Invalid priority selected, return appropriate error code. */
status = TX_PRIORITY_ERROR;
}
/* Check preemption threshold. */
else if (preempt_threshold > priority)
{
/* Invalid preempt threshold, return appropriate error code. */
status = TX_THRESH_ERROR;
}
/* Check the start selection. */
else if (auto_start > TX_AUTO_START)
{
/* Invalid auto start selection, return appropriate error code. */
status = TX_START_ERROR;
}
else
{
#ifndef TX_TIMER_PROCESS_IN_ISR
/* Pickup thread pointer. */
TX_THREAD_GET_CURRENT(current_thread)
/* Check for invalid caller of this function. First check for a calling thread. */
if (current_thread == &_tx_timer_thread)
{
/* Invalid caller of this function, return appropriate error code. */
status = TX_CALLER_ERROR;
}
#endif
/* Check for interrupt call. */
if (TX_THREAD_GET_SYSTEM_STATE() != ((ULONG) 0))
{
/* Now, make sure the call is from an interrupt and not initialization. */
if (TX_THREAD_GET_SYSTEM_STATE() < TX_INITIALIZE_IN_PROGRESS)
{
/* Invalid caller of this function, return appropriate error code. */
status = TX_CALLER_ERROR;
}
}
}
}
/* Determine if everything is okay. */
if (status == TX_SUCCESS)
{
/* Call actual thread create function. */
status = _tx_thread_create(thread_ptr, name_ptr, entry_function, entry_input,
stack_start, stack_size, priority, preempt_threshold,
time_slice, auto_start);
}
/* Return completion status. */
return(status);
}
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