1 /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19 #include "pthreadP.h"
20
21
22 void
23 attribute_protected
__pthread_cleanup_push_defer(struct _pthread_cleanup_buffer * buffer,void (* routine)(void *),void * arg)24 __pthread_cleanup_push_defer (
25 struct _pthread_cleanup_buffer *buffer,
26 void (*routine) (void *),
27 void *arg)
28 {
29 struct pthread *self = THREAD_SELF;
30
31 buffer->__routine = routine;
32 buffer->__arg = arg;
33 buffer->__prev = THREAD_GETMEM (self, cleanup);
34
35 int cancelhandling = THREAD_GETMEM (self, cancelhandling);
36
37 /* Disable asynchronous cancellation for now. */
38 if (__builtin_expect (cancelhandling & CANCELTYPE_BITMASK, 0))
39 while (1)
40 {
41 int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
42 cancelhandling
43 & ~CANCELTYPE_BITMASK,
44 cancelhandling);
45 if (__builtin_expect (curval == cancelhandling, 1))
46 /* Successfully replaced the value. */
47 break;
48
49 /* Prepare for the next round. */
50 cancelhandling = curval;
51 }
52
53 buffer->__canceltype = (cancelhandling & CANCELTYPE_BITMASK
54 ? PTHREAD_CANCEL_ASYNCHRONOUS
55 : PTHREAD_CANCEL_DEFERRED);
56
57 THREAD_SETMEM (self, cleanup, buffer);
58 }
strong_alias(__pthread_cleanup_push_defer,_pthread_cleanup_push_defer)59 strong_alias (__pthread_cleanup_push_defer, _pthread_cleanup_push_defer)
60
61
62 void
63 attribute_protected
64 __pthread_cleanup_pop_restore (
65 struct _pthread_cleanup_buffer *buffer,
66 int execute)
67 {
68 struct pthread *self = THREAD_SELF;
69
70 THREAD_SETMEM (self, cleanup, buffer->__prev);
71
72 int cancelhandling;
73 if (__builtin_expect (buffer->__canceltype != PTHREAD_CANCEL_DEFERRED, 0)
74 && ((cancelhandling = THREAD_GETMEM (self, cancelhandling))
75 & CANCELTYPE_BITMASK) == 0)
76 {
77 while (1)
78 {
79 int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
80 cancelhandling
81 | CANCELTYPE_BITMASK,
82 cancelhandling);
83 if (__builtin_expect (curval == cancelhandling, 1))
84 /* Successfully replaced the value. */
85 break;
86
87 /* Prepare for the next round. */
88 cancelhandling = curval;
89 }
90
91 CANCELLATION_P (self);
92 }
93
94 /* If necessary call the cleanup routine after we removed the
95 current cleanup block from the list. */
96 if (execute)
97 buffer->__routine (buffer->__arg);
98 }
99 strong_alias (__pthread_cleanup_pop_restore, _pthread_cleanup_pop_restore)
100