Outline ![]()
Files ![]()
loading...
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
/**************************************************************************/
/* */
/* 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);
}