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
|
/**
* @file
*
* @brief Thread Queue Operations
* @ingroup ScoreThreadQ
*/
/*
* COPYRIGHT (c) 1989-2014.
* 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.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/threadqimpl.h>
#include <rtems/score/assert.h>
#include <rtems/score/threaddispatch.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/watchdogimpl.h>
#define THREAD_QUEUE_INTEND_TO_BLOCK \
(THREAD_WAIT_CLASS_OBJECT | THREAD_WAIT_STATE_INTEND_TO_BLOCK)
#define THREAD_QUEUE_BLOCKED \
(THREAD_WAIT_CLASS_OBJECT | THREAD_WAIT_STATE_BLOCKED)
#define THREAD_QUEUE_READY_AGAIN \
(THREAD_WAIT_CLASS_OBJECT | THREAD_WAIT_STATE_READY_AGAIN)
static void _Thread_queue_Unblock( Thread_Control *the_thread )
{
_Watchdog_Remove_ticks( &the_thread->Timer );
_Thread_Unblock( the_thread );
#if defined(RTEMS_MULTIPROCESSING)
if ( !_Objects_Is_local_id( the_thread->Object.id ) ) {
_Thread_MP_Free_proxy( the_thread );
}
#endif
}
void _Thread_queue_Enqueue_critical(
Thread_queue_Control *the_thread_queue,
Thread_Control *the_thread,
States_Control state,
Watchdog_Interval timeout,
uint32_t timeout_code,
ISR_lock_Context *lock_context
)
{
const Thread_queue_Operations *operations;
Per_CPU_Control *cpu_self;
bool success;
_Thread_Lock_set( the_thread, &the_thread_queue->Lock );
operations = the_thread_queue->operations;
_Thread_Wait_set_queue( the_thread, the_thread_queue );
_Thread_Wait_set_operations( the_thread, operations );
( *operations->enqueue )( the_thread_queue, the_thread );
_Thread_Wait_flags_set( the_thread, THREAD_QUEUE_INTEND_TO_BLOCK );
cpu_self = _Thread_Dispatch_disable_critical();
_Thread_queue_Release( the_thread_queue, lock_context );
#if defined(RTEMS_MULTIPROCESSING)
if ( _Thread_MP_Is_receive( the_thread ) && the_thread->receive_packet )
the_thread = _Thread_MP_Allocate_proxy( state );
else
#endif
/*
* Set the blocking state for this thread queue in the thread.
*/
_Thread_Set_state( the_thread, state );
/*
* If the thread wants to timeout, then schedule its timer.
*/
if ( timeout != WATCHDOG_NO_TIMEOUT ) {
_Thread_Wait_set_timeout_code( the_thread, timeout_code );
_Watchdog_Initialize( &the_thread->Timer, _Thread_Timeout, 0, the_thread );
_Watchdog_Insert_ticks( &the_thread->Timer, timeout );
}
success = _Thread_Wait_flags_try_change(
the_thread,
THREAD_QUEUE_INTEND_TO_BLOCK,
THREAD_QUEUE_BLOCKED
);
if ( !success ) {
_Thread_queue_Unblock( the_thread );
}
_Thread_Dispatch_enable( cpu_self );
}
void _Thread_queue_Extract_locked(
Thread_queue_Control *the_thread_queue,
Thread_Control *the_thread
)
{
( *the_thread_queue->operations->extract )( the_thread_queue, the_thread );
_Thread_Wait_set_queue( the_thread, NULL );
_Thread_Wait_restore_default_operations( the_thread );
_Thread_Lock_restore_default( the_thread );
}
void _Thread_queue_Unblock_critical(
Thread_queue_Control *the_thread_queue,
Thread_Control *the_thread,
ISR_lock_Context *lock_context
)
{
bool success;
bool unblock;
success = _Thread_Wait_flags_try_change_critical(
the_thread,
THREAD_QUEUE_INTEND_TO_BLOCK,
THREAD_QUEUE_READY_AGAIN
);
if ( success ) {
unblock = false;
} else {
_Assert( _Thread_Wait_flags_get( the_thread ) == THREAD_QUEUE_BLOCKED );
_Thread_Wait_flags_set( the_thread, THREAD_QUEUE_READY_AGAIN );
unblock = true;
}
if ( unblock ) {
Per_CPU_Control *cpu_self;
cpu_self = _Thread_Dispatch_disable_critical();
_Thread_queue_Release( the_thread_queue, lock_context );
_Thread_queue_Unblock( the_thread );
_Thread_Dispatch_enable( cpu_self );
} else {
_Thread_queue_Release( the_thread_queue, lock_context );
}
}
void _Thread_queue_Extract_critical(
Thread_queue_Control *the_thread_queue,
Thread_Control *the_thread,
ISR_lock_Context *lock_context
)
{
_Thread_queue_Extract_locked( the_thread_queue, the_thread );
_Thread_queue_Unblock_critical( the_thread_queue, the_thread, lock_context );
}
void _Thread_queue_Extract( Thread_Control *the_thread )
{
ISR_lock_Context lock_context;
ISR_lock_Control *lock;
Thread_queue_Control *the_thread_queue;
lock = _Thread_Lock_acquire( the_thread, &lock_context );
the_thread_queue = the_thread->Wait.queue;
if ( the_thread_queue != NULL ) {
_SMP_Assert( lock == &the_thread_queue->Lock );
_Thread_queue_Extract_critical( the_thread_queue, the_thread, &lock_context );
} else {
_Thread_Lock_release( lock, &lock_context );
}
}
Thread_Control *_Thread_queue_Dequeue( Thread_queue_Control *the_thread_queue )
{
ISR_lock_Context lock_context;
Thread_Control *the_thread;
_Thread_queue_Acquire( the_thread_queue, &lock_context );
the_thread = _Thread_queue_First_locked( the_thread_queue );
if ( the_thread != NULL ) {
_SMP_Assert( the_thread->Lock.current == &the_thread_queue->Lock );
_Thread_queue_Extract_critical( the_thread_queue, the_thread, &lock_context );
} else {
_Thread_queue_Release( the_thread_queue, &lock_context );
}
return the_thread;
}
|
