1 | /* cancel.c |
---|
2 | * |
---|
3 | * $Id$ |
---|
4 | */ |
---|
5 | |
---|
6 | #include <pthread.h> |
---|
7 | #include <errno.h> |
---|
8 | #include <rtems/score/chain.h> |
---|
9 | #include <rtems/score/isr.h> |
---|
10 | #include <rtems/score/thread.h> |
---|
11 | #include <rtems/score/wkspace.h> |
---|
12 | #include <rtems/posix/cancel.h> |
---|
13 | #include <rtems/posix/pthread.h> |
---|
14 | #include <rtems/posix/threadsup.h> |
---|
15 | |
---|
16 | /*PAGE |
---|
17 | * |
---|
18 | * POSIX_Thread_cancel_run |
---|
19 | * |
---|
20 | */ |
---|
21 | |
---|
22 | void POSIX_Thread_cancel_run( |
---|
23 | Thread_Control *the_thread |
---|
24 | ) |
---|
25 | { |
---|
26 | int old_cancel_state; |
---|
27 | POSIX_Cancel_Handler_control *handler; |
---|
28 | Chain_Control *handler_stack; |
---|
29 | POSIX_API_Thread_Support_Control *thread_support; |
---|
30 | ISR_Level level; |
---|
31 | |
---|
32 | thread_support = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
---|
33 | |
---|
34 | handler_stack = &thread_support->Cancellation_Handlers; |
---|
35 | |
---|
36 | old_cancel_state = thread_support->cancelability_state; |
---|
37 | |
---|
38 | thread_support->cancelability_state = PTHREAD_CANCEL_DISABLE; |
---|
39 | |
---|
40 | while ( !_Chain_Is_empty( handler_stack ) ) { |
---|
41 | _ISR_Disable( level ); |
---|
42 | handler = (POSIX_Cancel_Handler_control *) _Chain_Tail( handler_stack ); |
---|
43 | _Chain_Extract_unprotected( &handler->Node ); |
---|
44 | _ISR_Enable( level ); |
---|
45 | |
---|
46 | (*handler->routine)( handler->arg ); |
---|
47 | |
---|
48 | _Workspace_Free( handler ); |
---|
49 | } |
---|
50 | |
---|
51 | thread_support->cancelation_requested = 0; |
---|
52 | |
---|
53 | thread_support->cancelability_state = old_cancel_state; |
---|
54 | } |
---|
55 | |
---|
56 | /*PAGE |
---|
57 | * |
---|
58 | * 18.2.1 Canceling Execution of a Thread, P1003.1c/Draft 10, p. 181 |
---|
59 | */ |
---|
60 | |
---|
61 | int pthread_cancel( |
---|
62 | pthread_t thread |
---|
63 | ) |
---|
64 | { |
---|
65 | Thread_Control *the_thread; |
---|
66 | POSIX_API_Thread_Support_Control *thread_support; |
---|
67 | Objects_Locations location; |
---|
68 | |
---|
69 | the_thread = _POSIX_Threads_Get( &thread, &location ); |
---|
70 | switch ( location ) { |
---|
71 | case OBJECTS_ERROR: |
---|
72 | return EINVAL; |
---|
73 | case OBJECTS_REMOTE: |
---|
74 | return POSIX_MP_NOT_IMPLEMENTED(); |
---|
75 | case OBJECTS_LOCAL: |
---|
76 | thread_support = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
---|
77 | |
---|
78 | thread_support->cancelation_requested = 1; |
---|
79 | |
---|
80 | _Thread_Enable_dispatch(); |
---|
81 | return 0; |
---|
82 | } |
---|
83 | |
---|
84 | return POSIX_BOTTOM_REACHED(); |
---|
85 | } |
---|
86 | |
---|
87 | /*PAGE |
---|
88 | * |
---|
89 | * 18.2.2 Setting Cancelability State, P1003.1c/Draft 10, p. 183 |
---|
90 | */ |
---|
91 | |
---|
92 | int pthread_setcancelstate( |
---|
93 | int state, |
---|
94 | int *oldstate |
---|
95 | ) |
---|
96 | { |
---|
97 | POSIX_API_Thread_Support_Control *thread_support; |
---|
98 | |
---|
99 | if ( !oldstate ) |
---|
100 | return EINVAL; |
---|
101 | |
---|
102 | if ( state != PTHREAD_CANCEL_ENABLE && state != PTHREAD_CANCEL_DISABLE ) |
---|
103 | return EINVAL; |
---|
104 | |
---|
105 | thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
---|
106 | |
---|
107 | *oldstate = thread_support->cancelability_state; |
---|
108 | thread_support->cancelability_state = state; |
---|
109 | |
---|
110 | if ( thread_support->cancelability_state == PTHREAD_CANCEL_ENABLE && |
---|
111 | thread_support->cancelability_type == PTHREAD_CANCEL_ASYNCHRONOUS && |
---|
112 | thread_support->cancelation_requested ) |
---|
113 | POSIX_Thread_cancel_run( _Thread_Executing ); |
---|
114 | |
---|
115 | return 0; |
---|
116 | } |
---|
117 | |
---|
118 | /*PAGE |
---|
119 | * |
---|
120 | * 18.2.2 Setting Cancelability State, P1003.1c/Draft 10, p. 183 |
---|
121 | */ |
---|
122 | |
---|
123 | int pthread_setcanceltype( |
---|
124 | int type, |
---|
125 | int *oldtype |
---|
126 | ) |
---|
127 | { |
---|
128 | POSIX_API_Thread_Support_Control *thread_support; |
---|
129 | |
---|
130 | if ( !oldtype ) |
---|
131 | return EINVAL; |
---|
132 | |
---|
133 | if ( type != PTHREAD_CANCEL_DEFERRED && type != PTHREAD_CANCEL_ASYNCHRONOUS ) |
---|
134 | return EINVAL; |
---|
135 | |
---|
136 | thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
---|
137 | |
---|
138 | *oldtype = thread_support->cancelability_type; |
---|
139 | thread_support->cancelability_type = type; |
---|
140 | |
---|
141 | if ( thread_support->cancelability_state == PTHREAD_CANCEL_ENABLE && |
---|
142 | thread_support->cancelability_type == PTHREAD_CANCEL_ASYNCHRONOUS && |
---|
143 | thread_support->cancelation_requested ) |
---|
144 | POSIX_Thread_cancel_run( _Thread_Executing ); |
---|
145 | |
---|
146 | return 0; |
---|
147 | } |
---|
148 | |
---|
149 | /*PAGE |
---|
150 | * |
---|
151 | * 18.2.2 Setting Cancelability State, P1003.1c/Draft 10, p. 183 |
---|
152 | */ |
---|
153 | |
---|
154 | void pthread_testcancel( void ) |
---|
155 | { |
---|
156 | POSIX_API_Thread_Support_Control *thread_support; |
---|
157 | |
---|
158 | thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
---|
159 | |
---|
160 | if ( thread_support->cancelability_state == PTHREAD_CANCEL_ENABLE && |
---|
161 | thread_support->cancelation_requested ) |
---|
162 | POSIX_Thread_cancel_run( _Thread_Executing ); |
---|
163 | } |
---|
164 | |
---|
165 | /*PAGE |
---|
166 | * |
---|
167 | * 18.2.3.1 Establishing Cancellation Handlers, P1003.1c/Draft 10, p. 184 |
---|
168 | */ |
---|
169 | |
---|
170 | void pthread_cleanup_push( |
---|
171 | void (*routine)( void * ), |
---|
172 | void *arg |
---|
173 | ) |
---|
174 | { |
---|
175 | POSIX_Cancel_Handler_control *handler; |
---|
176 | Chain_Control *handler_stack; |
---|
177 | POSIX_API_Thread_Support_Control *thread_support; |
---|
178 | |
---|
179 | if ( !routine ) |
---|
180 | return; /* XXX what to do really? */ |
---|
181 | |
---|
182 | handler = _Workspace_Allocate( sizeof( POSIX_Cancel_Handler_control ) ); |
---|
183 | |
---|
184 | if ( !handler ) |
---|
185 | return; /* XXX what to do really? */ |
---|
186 | |
---|
187 | thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
---|
188 | |
---|
189 | handler_stack = &thread_support->Cancellation_Handlers; |
---|
190 | |
---|
191 | handler->routine = routine; |
---|
192 | handler->arg = arg; |
---|
193 | |
---|
194 | _Chain_Append( handler_stack, &handler->Node ); |
---|
195 | } |
---|
196 | |
---|
197 | /*PAGE |
---|
198 | * |
---|
199 | * 18.2.3.1 Establishing Cancellation Handlers, P1003.1c/Draft 10, p. 184 |
---|
200 | */ |
---|
201 | |
---|
202 | void pthread_cleanup_pop( |
---|
203 | int execute |
---|
204 | ) |
---|
205 | { |
---|
206 | POSIX_Cancel_Handler_control *handler; |
---|
207 | Chain_Control *handler_stack; |
---|
208 | POSIX_API_Thread_Support_Control *thread_support; |
---|
209 | ISR_Level level; |
---|
210 | |
---|
211 | thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
---|
212 | |
---|
213 | handler_stack = &thread_support->Cancellation_Handlers; |
---|
214 | |
---|
215 | if ( _Chain_Is_empty( handler_stack ) ) |
---|
216 | return; |
---|
217 | |
---|
218 | _ISR_Disable( level ); |
---|
219 | handler = (POSIX_Cancel_Handler_control *) _Chain_Tail( handler_stack ); |
---|
220 | _Chain_Extract_unprotected( &handler->Node ); |
---|
221 | _ISR_Enable( level ); |
---|
222 | |
---|
223 | if ( execute ) |
---|
224 | (*handler->routine)( handler->arg ); |
---|
225 | |
---|
226 | _Workspace_Free( handler ); |
---|
227 | } |
---|