From 852421fda03a7722d7adb45b187235cd66fa264e Mon Sep 17 00:00:00 2001 From: PProvost Date: Mon, 11 May 2020 08:55:07 -0600 Subject: Initial commit --- common/src/tx_thread_create.c | 360 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 360 insertions(+) create mode 100644 common/src/tx_thread_create.c (limited to 'common/src/tx_thread_create.c') diff --git a/common/src/tx_thread_create.c b/common/src/tx_thread_create.c new file mode 100644 index 00000000..4169d362 --- /dev/null +++ b/common/src/tx_thread_create.c @@ -0,0 +1,360 @@ +/**************************************************************************/ +/* */ +/* 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 */ +/* 6.0 */ +/* 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 */ +/* */ +/**************************************************************************/ +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 +ULONG new_stack_start; +ULONG 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. */ + new_stack_start = TX_POINTER_TO_ULONG_CONVERT(stack_start); + updated_stack_start = ((((ULONG) 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. */ + stack_start = TX_ULONG_TO_POINTER_CONVERT(updated_stack_start); +#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); +} + -- cgit v1.3.1