1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @brief Changes the Priority of a Thread |
---|
5 | * |
---|
6 | * @ingroup ScoreThread |
---|
7 | */ |
---|
8 | |
---|
9 | /* |
---|
10 | * COPYRIGHT (c) 1989-2014. |
---|
11 | * On-Line Applications Research Corporation (OAR). |
---|
12 | * |
---|
13 | * The license and distribution terms for this file may be |
---|
14 | * found in the file LICENSE in this distribution or at |
---|
15 | * http://www.rtems.org/license/LICENSE. |
---|
16 | */ |
---|
17 | |
---|
18 | #if HAVE_CONFIG_H |
---|
19 | #include "config.h" |
---|
20 | #endif |
---|
21 | |
---|
22 | #include <rtems/score/threadimpl.h> |
---|
23 | #include <rtems/score/schedulerimpl.h> |
---|
24 | #include <rtems/score/threadqimpl.h> |
---|
25 | |
---|
26 | void _Thread_Change_priority( |
---|
27 | Thread_Control *the_thread, |
---|
28 | Priority_Control new_priority, |
---|
29 | bool prepend_it |
---|
30 | ) |
---|
31 | { |
---|
32 | ISR_lock_Context lock_context; |
---|
33 | ISR_lock_Control *lock; |
---|
34 | |
---|
35 | lock = _Thread_Lock_acquire( the_thread, &lock_context ); |
---|
36 | |
---|
37 | /* |
---|
38 | * Do not bother recomputing all the priority related information if |
---|
39 | * we are not REALLY changing priority. |
---|
40 | */ |
---|
41 | if ( the_thread->current_priority != new_priority ) { |
---|
42 | uint32_t my_generation; |
---|
43 | ISR_Level level; |
---|
44 | |
---|
45 | my_generation = the_thread->Priority.generation + 1; |
---|
46 | the_thread->current_priority = new_priority; |
---|
47 | the_thread->Priority.generation = my_generation; |
---|
48 | |
---|
49 | (*the_thread->Priority.change_handler)( |
---|
50 | the_thread, |
---|
51 | new_priority, |
---|
52 | the_thread->Priority.change_handler_context |
---|
53 | ); |
---|
54 | |
---|
55 | _Thread_Lock_release( lock, &lock_context ); |
---|
56 | |
---|
57 | _ISR_Disable( level ); |
---|
58 | |
---|
59 | if ( the_thread->Priority.generation == my_generation ) { |
---|
60 | if ( _States_Is_ready( the_thread->current_state ) ) { |
---|
61 | _Scheduler_Change_priority( |
---|
62 | the_thread, |
---|
63 | new_priority, |
---|
64 | prepend_it |
---|
65 | ); |
---|
66 | } else { |
---|
67 | _Scheduler_Update_priority( the_thread, new_priority ); |
---|
68 | } |
---|
69 | } |
---|
70 | |
---|
71 | _ISR_Enable( level ); |
---|
72 | } else { |
---|
73 | _Thread_Lock_release( lock, &lock_context ); |
---|
74 | } |
---|
75 | } |
---|