1 | /* |
---|
2 | * COPYRIGHT (c) 1989-2008. |
---|
3 | * On-Line Applications Research Corporation (OAR). |
---|
4 | * |
---|
5 | * The license and distribution terms for this file may be |
---|
6 | * found in the file LICENSE in this distribution or at |
---|
7 | * http://www.rtems.com/license/LICENSE. |
---|
8 | * |
---|
9 | * $Id$ |
---|
10 | */ |
---|
11 | |
---|
12 | #if HAVE_CONFIG_H |
---|
13 | #include "config.h" |
---|
14 | #endif |
---|
15 | |
---|
16 | #include <pthread.h> |
---|
17 | #include <errno.h> |
---|
18 | |
---|
19 | #include <rtems/system.h> |
---|
20 | #include <rtems/score/chain.h> |
---|
21 | #include <rtems/score/isr.h> |
---|
22 | #include <rtems/score/thread.h> |
---|
23 | #include <rtems/score/wkspace.h> |
---|
24 | #include <rtems/posix/cancel.h> |
---|
25 | #include <rtems/posix/pthread.h> |
---|
26 | #include <rtems/posix/threadsup.h> |
---|
27 | |
---|
28 | /*PAGE |
---|
29 | * |
---|
30 | * 18.2.3.1 Establishing Cancellation Handlers, P1003.1c/Draft 10, p. 184 |
---|
31 | */ |
---|
32 | |
---|
33 | void pthread_cleanup_pop( |
---|
34 | int execute |
---|
35 | ) |
---|
36 | { |
---|
37 | POSIX_Cancel_Handler_control *handler; |
---|
38 | POSIX_Cancel_Handler_control tmp_handler; |
---|
39 | Chain_Control *handler_stack; |
---|
40 | POSIX_API_Control *thread_support; |
---|
41 | ISR_Level level; |
---|
42 | |
---|
43 | thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
---|
44 | |
---|
45 | handler_stack = &thread_support->Cancellation_Handlers; |
---|
46 | |
---|
47 | /* |
---|
48 | * We need interrupts disabled to safely check the chain and pull |
---|
49 | * the last element off. But we also need dispatching disabled to |
---|
50 | * ensure that we do not get prempted and deleted while we are holding |
---|
51 | * memory that needs to be freed. |
---|
52 | */ |
---|
53 | |
---|
54 | _Thread_Disable_dispatch(); |
---|
55 | _ISR_Disable( level ); |
---|
56 | |
---|
57 | if ( _Chain_Is_empty( handler_stack ) ) { |
---|
58 | _Thread_Enable_dispatch(); |
---|
59 | _ISR_Enable( level ); |
---|
60 | return; |
---|
61 | } |
---|
62 | |
---|
63 | handler = (POSIX_Cancel_Handler_control *) |
---|
64 | _Chain_Tail( handler_stack )->previous; |
---|
65 | _Chain_Extract_unprotected( &handler->Node ); |
---|
66 | |
---|
67 | _ISR_Enable( level ); |
---|
68 | |
---|
69 | tmp_handler = *handler; |
---|
70 | |
---|
71 | _Workspace_Free( handler ); |
---|
72 | |
---|
73 | _Thread_Enable_dispatch(); |
---|
74 | |
---|
75 | if ( execute ) |
---|
76 | (*tmp_handler.routine)( tmp_handler.arg ); |
---|
77 | } |
---|