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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_trace.h"
#include "tx_thread.h"
#include "tx_initialize.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_thread_create PORTABLE C */
/* 6.1.8 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function creates a thread and places it on the list of created */
/* threads. */
/* */
/* 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 */
/* (default 0-31) */
/* preempt_threshold Preemption threshold */
/* time_slice Thread time-slice value */
/* auto_start Automatic start selection */
/* */
/* OUTPUT */
/* */
/* return status Thread create return status */
/* */
/* CALLS */
/* */
/* _tx_thread_stack_build Build initial thread stack */
/* _tx_thread_system_resume Resume automatic start thread */
/* _tx_thread_system_ni_resume Noninterruptable resume thread*/
/* */
/* CALLED BY */
/* */
/* Application Code */
/* _tx_timer_initialize Create system timer thread */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 William E. Lamie Modified comment(s), and */
/* changed stack calculations */
/* to use ALIGN_TYPE integers, */
/* resulting in version 6.1 */
/* 06-02-2021 William E. Lamie Modified comment(s), and */
/* supported TX_MISRA_ENABLE, */
/* 08-02-2021 Scott Larson Removed unneeded cast, */
/* resulting in version 6.1.8 */
/* */
/**************************************************************************/
UINT _tx_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)
{
TX_INTERRUPT_SAVE_AREA
TX_THREAD *next_thread;
TX_THREAD *previous_thread;
TX_THREAD *saved_thread_ptr;
UINT saved_threshold = ((UINT) 0);
UCHAR *temp_ptr;
#ifdef TX_ENABLE_STACK_CHECKING
ALIGN_TYPE new_stack_start;
ALIGN_TYPE updated_stack_start;
#endif
#ifndef TX_DISABLE_STACK_FILLING
/* Set the thread stack to a pattern prior to creating the initial
stack frame. This pattern is used by the stack checking routines
to see how much has been used. */
TX_MEMSET(stack_start, ((UCHAR) TX_STACK_FILL), stack_size);
#endif
#ifdef TX_ENABLE_STACK_CHECKING
/* Ensure that there are two ULONG of 0xEF patterns at the top and
bottom of the thread's stack. This will be used to check for stack
overflow conditions during run-time. */
stack_size = ((stack_size/(sizeof(ULONG))) * (sizeof(ULONG))) - (sizeof(ULONG));
/* Ensure the starting stack address is evenly aligned. */
#ifdef TX_MISRA_ENABLE
new_stack_start = TX_POINTER_TO_ULONG_CONVERT(stack_start);
#else
new_stack_start = TX_POINTER_TO_ALIGN_TYPE_CONVERT(stack_start);
#endif /* TX_MISRA_ENABLE */
updated_stack_start = (((new_stack_start) + ((sizeof(ULONG)) - ((ULONG) 1)) ) & (~((sizeof(ULONG)) - ((ULONG) 1))));
/* Determine if the starting stack address is different. */
if (new_stack_start != updated_stack_start)
{
/* Yes, subtract another ULONG from the size to avoid going past the stack area. */
stack_size = stack_size - (sizeof(ULONG));
}
/* Update the starting stack pointer. */
#ifdef TX_MISRA_ENABLE
stack_start = TX_ULONG_TO_POINTER_CONVERT(updated_stack_start);
#else
stack_start = TX_ALIGN_TYPE_TO_POINTER_CONVERT(updated_stack_start);
#endif /* TX_MISRA_ENABLE */
#endif
/* Prepare the thread control block prior to placing it on the created
list. */
/* Initialize thread control block to all zeros. */
TX_MEMSET(thread_ptr, 0, (sizeof(TX_THREAD)));
/* Place the supplied parameters into the thread's control block. */
thread_ptr -> tx_thread_name = name_ptr;
thread_ptr -> tx_thread_entry = entry_function;
thread_ptr -> tx_thread_entry_parameter = entry_input;
thread_ptr -> tx_thread_stack_start = stack_start;
thread_ptr -> tx_thread_stack_size = stack_size;
thread_ptr -> tx_thread_priority = priority;
thread_ptr -> tx_thread_user_priority = priority;
thread_ptr -> tx_thread_time_slice = time_slice;
thread_ptr -> tx_thread_new_time_slice = time_slice;
thread_ptr -> tx_thread_inherit_priority = ((UINT) TX_MAX_PRIORITIES);
/* Calculate the end of the thread's stack area. */
temp_ptr = TX_VOID_TO_UCHAR_POINTER_CONVERT(stack_start);
temp_ptr = (TX_UCHAR_POINTER_ADD(temp_ptr, (stack_size - ((ULONG) 1))));
thread_ptr -> tx_thread_stack_end = TX_UCHAR_TO_VOID_POINTER_CONVERT(temp_ptr);
#ifndef TX_DISABLE_PREEMPTION_THRESHOLD
/* Preemption-threshold is enabled, setup accordingly. */
thread_ptr -> tx_thread_preempt_threshold = preempt_threshold;
thread_ptr -> tx_thread_user_preempt_threshold = preempt_threshold;
#else
/* Preemption-threshold is disabled, determine if preemption-threshold was required. */
if (priority != preempt_threshold)
{
/* Preemption-threshold specified. Since specific preemption-threshold is not supported,
disable all preemption. */
thread_ptr -> tx_thread_preempt_threshold = ((UINT) 0);
thread_ptr -> tx_thread_user_preempt_threshold = ((UINT) 0);
}
else
{
/* Preemption-threshold is not specified, just setup with the priority. */
thread_ptr -> tx_thread_preempt_threshold = priority;
thread_ptr -> tx_thread_user_preempt_threshold = priority;
}
#endif
/* Now fill in the values that are required for thread initialization. */
thread_ptr -> tx_thread_state = TX_SUSPENDED;
/* Setup the necessary fields in the thread timer block. */
TX_THREAD_CREATE_TIMEOUT_SETUP(thread_ptr)
/* Perform any additional thread setup activities for tool or user purpose. */
TX_THREAD_CREATE_INTERNAL_EXTENSION(thread_ptr)
/* Call the target specific stack frame building routine to build the
thread's initial stack and to setup the actual stack pointer in the
control block. */
_tx_thread_stack_build(thread_ptr, _tx_thread_shell_entry);
#ifdef TX_ENABLE_STACK_CHECKING
/* Setup the highest usage stack pointer. */
thread_ptr -> tx_thread_stack_highest_ptr = thread_ptr -> tx_thread_stack_ptr;
#endif
/* Prepare to make this thread a member of the created thread list. */
TX_DISABLE
/* Load the thread ID field in the thread control block. */
thread_ptr -> tx_thread_id = TX_THREAD_ID;
/* Place the thread on the list of created threads. First,
check for an empty list. */
if (_tx_thread_created_count == TX_EMPTY)
{
/* The created thread list is empty. Add thread to empty list. */
_tx_thread_created_ptr = thread_ptr;
thread_ptr -> tx_thread_created_next = thread_ptr;
thread_ptr -> tx_thread_created_previous = thread_ptr;
}
else
{
/* This list is not NULL, add to the end of the list. */
next_thread = _tx_thread_created_ptr;
previous_thread = next_thread -> tx_thread_created_previous;
/* Place the new thread in the list. */
next_thread -> tx_thread_created_previous = thread_ptr;
previous_thread -> tx_thread_created_next = thread_ptr;
/* Setup this thread's created links. */
thread_ptr -> tx_thread_created_previous = previous_thread;
thread_ptr -> tx_thread_created_next = next_thread;
}
/* Increment the thread created count. */
_tx_thread_created_count++;
/* If trace is enabled, register this object. */
TX_TRACE_OBJECT_REGISTER(TX_TRACE_OBJECT_TYPE_THREAD, thread_ptr, name_ptr, TX_POINTER_TO_ULONG_CONVERT(stack_start), stack_size)
/* If trace is enabled, insert this event into the trace buffer. */
TX_TRACE_IN_LINE_INSERT(TX_TRACE_THREAD_CREATE, thread_ptr, priority, TX_POINTER_TO_ULONG_CONVERT(stack_start), stack_size, TX_TRACE_THREAD_EVENTS)
/* Register thread in the thread array structure. */
TX_EL_THREAD_REGISTER(thread_ptr)
/* Log this kernel call. */
TX_EL_THREAD_CREATE_INSERT
#ifndef TX_NOT_INTERRUPTABLE
/* Temporarily disable preemption. */
_tx_thread_preempt_disable++;
#endif
/* Determine if an automatic start was requested. If so, call the resume
thread function and then check for a preemption condition. */
if (auto_start == TX_AUTO_START)
{
/* Determine if the create call is being called from initialization. */
if (TX_THREAD_GET_SYSTEM_STATE() >= TX_INITIALIZE_IN_PROGRESS)
{
/* Yes, this create call was made from initialization. */
/* Pickup the current thread execute pointer, which corresponds to the
highest priority thread ready to execute. Interrupt lockout is
not required, since interrupts are assumed to be disabled during
initialization. */
saved_thread_ptr = _tx_thread_execute_ptr;
/* Determine if there is thread ready for execution. */
if (saved_thread_ptr != TX_NULL)
{
/* Yes, a thread is ready for execution when initialization completes. */
/* Save the current preemption-threshold. */
saved_threshold = saved_thread_ptr -> tx_thread_preempt_threshold;
/* For initialization, temporarily set the preemption-threshold to the
priority level to make sure the highest-priority thread runs once
initialization is complete. */
saved_thread_ptr -> tx_thread_preempt_threshold = saved_thread_ptr -> tx_thread_priority;
}
}
else
{
/* Simply set the saved thread pointer to NULL. */
saved_thread_ptr = TX_NULL;
}
#ifdef TX_NOT_INTERRUPTABLE
/* Perform any additional activities for tool or user purpose. */
TX_THREAD_CREATE_EXTENSION(thread_ptr)
/* Resume the thread! */
_tx_thread_system_ni_resume(thread_ptr);
/* Restore previous interrupt posture. */
TX_RESTORE
#else
/* Restore previous interrupt posture. */
TX_RESTORE
/* Perform any additional activities for tool or user purpose. */
TX_THREAD_CREATE_EXTENSION(thread_ptr)
/* Call the resume thread function to make this thread ready. */
_tx_thread_system_resume(thread_ptr);
#endif
/* Determine if the thread's preemption-threshold needs to be restored. */
if (saved_thread_ptr != TX_NULL)
{
/* Yes, restore the previous highest-priority thread's preemption-threshold. This
can only happen if this routine is called from initialization. */
saved_thread_ptr -> tx_thread_preempt_threshold = saved_threshold;
}
}
else
{
#ifdef TX_NOT_INTERRUPTABLE
/* Perform any additional activities for tool or user purpose. */
TX_THREAD_CREATE_EXTENSION(thread_ptr)
/* Restore interrupts. */
TX_RESTORE
#else
/* Restore interrupts. */
TX_RESTORE
/* Perform any additional activities for tool or user purpose. */
TX_THREAD_CREATE_EXTENSION(thread_ptr)
/* Disable interrupts. */
TX_DISABLE
/* Re-enable preemption. */
_tx_thread_preempt_disable--;
/* Restore interrupts. */
TX_RESTORE
/* Check for preemption. */
_tx_thread_system_preempt_check();
#endif
}
/* Always return a success. */
return(TX_SUCCESS);
}