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
|
/*
* Thread Handler / Thread Initialize
*
* COPYRIGHT (c) 1989-2011.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/score/apiext.h>
#include <rtems/score/context.h>
#include <rtems/score/interr.h>
#include <rtems/score/isr.h>
#include <rtems/score/object.h>
#include <rtems/score/priority.h>
#include <rtems/score/scheduler.h>
#include <rtems/score/states.h>
#include <rtems/score/sysstate.h>
#include <rtems/score/thread.h>
#include <rtems/score/threadq.h>
#include <rtems/score/userext.h>
#include <rtems/score/watchdog.h>
#include <rtems/score/wkspace.h>
/*
* _Thread_Initialize
*
* This routine initializes the specified the thread. It allocates
* all memory associated with this thread. It completes by adding
* the thread to the local object table so operations on this
* thread id are allowed.
*/
bool _Thread_Initialize(
Objects_Information *information,
Thread_Control *the_thread,
void *stack_area,
size_t stack_size,
bool is_fp,
Priority_Control priority,
bool is_preemptible,
Thread_CPU_budget_algorithms budget_algorithm,
Thread_CPU_budget_algorithm_callout budget_callout,
uint32_t isr_level,
Objects_Name name
)
{
size_t actual_stack_size = 0;
void *stack = NULL;
#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
void *fp_area;
#endif
void *sched = NULL;
void *extensions_area;
bool extension_status;
int i;
/*
* Initialize the Ada self pointer
*/
#if __RTEMS_ADA__
the_thread->rtems_ada_self = NULL;
#endif
/*
* Zero out all the allocated memory fields
*/
for ( i=0 ; i <= THREAD_API_LAST ; i++ )
the_thread->API_Extensions[i] = NULL;
extensions_area = NULL;
the_thread->libc_reent = NULL;
#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
fp_area = NULL;
#endif
/*
* Allocate and Initialize the stack for this thread.
*/
#if !defined(RTEMS_SCORE_THREAD_ENABLE_USER_PROVIDED_STACK_VIA_API)
actual_stack_size = _Thread_Stack_Allocate( the_thread, stack_size );
if ( !actual_stack_size || actual_stack_size < stack_size )
return false; /* stack allocation failed */
stack = the_thread->Start.stack;
#else
if ( !stack_area ) {
actual_stack_size = _Thread_Stack_Allocate( the_thread, stack_size );
if ( !actual_stack_size || actual_stack_size < stack_size )
return false; /* stack allocation failed */
stack = the_thread->Start.stack;
the_thread->Start.core_allocated_stack = true;
} else {
stack = stack_area;
actual_stack_size = stack_size;
the_thread->Start.core_allocated_stack = false;
}
#endif
_Stack_Initialize(
&the_thread->Start.Initial_stack,
stack,
actual_stack_size
);
/*
* Allocate the floating point area for this thread
*/
#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
if ( is_fp ) {
fp_area = _Workspace_Allocate( CONTEXT_FP_SIZE );
if ( !fp_area )
goto failed;
fp_area = _Context_Fp_start( fp_area, 0 );
}
the_thread->fp_context = fp_area;
the_thread->Start.fp_context = fp_area;
#endif
/*
* Initialize the thread timer
*/
_Watchdog_Initialize( &the_thread->Timer, NULL, 0, NULL );
#ifdef __RTEMS_STRICT_ORDER_MUTEX__
/* Initialize the head of chain of held mutexes */
_Chain_Initialize_empty(&the_thread->lock_mutex);
#endif
/*
* Allocate the extensions area for this thread
*/
if ( _Thread_Maximum_extensions ) {
extensions_area = _Workspace_Allocate(
(_Thread_Maximum_extensions + 1) * sizeof( void * )
);
if ( !extensions_area )
goto failed;
}
the_thread->extensions = (void **) extensions_area;
/*
* Clear the extensions area so extension users can determine
* if they are linked to the thread. An extension user may
* create the extension long after tasks have been created
* so they cannot rely on the thread create user extension
* call.
*/
if ( the_thread->extensions ) {
for ( i = 0; i <= _Thread_Maximum_extensions ; i++ )
the_thread->extensions[i] = NULL;
}
/*
* General initialization
*/
the_thread->Start.is_preemptible = is_preemptible;
the_thread->Start.budget_algorithm = budget_algorithm;
the_thread->Start.budget_callout = budget_callout;
switch ( budget_algorithm ) {
case THREAD_CPU_BUDGET_ALGORITHM_NONE:
case THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE:
break;
#if defined(RTEMS_SCORE_THREAD_ENABLE_EXHAUST_TIMESLICE)
case THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE:
the_thread->cpu_time_budget = _Thread_Ticks_per_timeslice;
break;
#endif
#if defined(RTEMS_SCORE_THREAD_ENABLE_SCHEDULER_CALLOUT)
case THREAD_CPU_BUDGET_ALGORITHM_CALLOUT:
break;
#endif
}
the_thread->Start.isr_level = isr_level;
the_thread->current_state = STATES_DORMANT;
the_thread->Wait.queue = NULL;
the_thread->resource_count = 0;
the_thread->real_priority = priority;
the_thread->Start.initial_priority = priority;
sched =_Scheduler_Allocate( the_thread );
if ( !sched )
goto failed;
_Thread_Set_priority( the_thread, priority );
/*
* Initialize the CPU usage statistics
*/
#ifndef __RTEMS_USE_TICKS_FOR_STATISTICS__
_Timestamp_Set_to_zero( &the_thread->cpu_time_used );
#else
the_thread->cpu_time_used = 0;
#endif
/*
* Open the object
*/
_Objects_Open( information, &the_thread->Object, name );
/*
* We assume the Allocator Mutex is locked and dispatching is
* enabled when we get here. We want to be able to run the
* user extensions with dispatching enabled. The Allocator
* Mutex provides sufficient protection to let the user extensions
* run safely.
*/
extension_status = _User_extensions_Thread_create( the_thread );
if ( extension_status )
return true;
failed:
_Workspace_Free( the_thread->libc_reent );
for ( i=0 ; i <= THREAD_API_LAST ; i++ )
_Workspace_Free( the_thread->API_Extensions[i] );
_Workspace_Free( extensions_area );
#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
_Workspace_Free( fp_area );
#endif
_Workspace_Free( sched );
_Thread_Stack_Free( the_thread );
return false;
}
|
