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b168057a | 1 | /* Copyright (C) 2002-2015 Free Software Foundation, Inc. |
6efd4814 UD |
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 | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
6efd4814 UD |
18 | |
19 | #include "pthreadP.h" | |
20 | ||
21 | ||
22 | void | |
23 | _pthread_cleanup_push_defer (buffer, routine, arg) | |
24 | struct _pthread_cleanup_buffer *buffer; | |
25 | void (*routine) (void *); | |
26 | void *arg; | |
27 | { | |
28 | struct pthread *self = THREAD_SELF; | |
29 | ||
30 | buffer->__routine = routine; | |
31 | buffer->__arg = arg; | |
32 | buffer->__prev = THREAD_GETMEM (self, cleanup); | |
33 | ||
34 | int cancelhandling = THREAD_GETMEM (self, cancelhandling); | |
35 | ||
36 | /* Disable asynchronous cancellation for now. */ | |
a1ffb40e | 37 | if (__glibc_unlikely (cancelhandling & CANCELTYPE_BITMASK)) |
6efd4814 UD |
38 | while (1) |
39 | { | |
40 | int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, | |
41 | cancelhandling | |
42 | & ~CANCELTYPE_BITMASK, | |
43 | cancelhandling); | |
a1ffb40e | 44 | if (__glibc_likely (curval == cancelhandling)) |
6efd4814 UD |
45 | /* Successfully replaced the value. */ |
46 | break; | |
47 | ||
48 | /* Prepare for the next round. */ | |
49 | cancelhandling = curval; | |
50 | } | |
51 | ||
52 | buffer->__canceltype = (cancelhandling & CANCELTYPE_BITMASK | |
53 | ? PTHREAD_CANCEL_ASYNCHRONOUS | |
54 | : PTHREAD_CANCEL_DEFERRED); | |
55 | ||
56 | THREAD_SETMEM (self, cleanup, buffer); | |
57 | } | |
58 | strong_alias (_pthread_cleanup_push_defer, __pthread_cleanup_push_defer) | |
59 | ||
60 | ||
61 | void | |
62 | _pthread_cleanup_pop_restore (buffer, execute) | |
63 | struct _pthread_cleanup_buffer *buffer; | |
64 | int execute; | |
65 | { | |
66 | struct pthread *self = THREAD_SELF; | |
67 | ||
68 | THREAD_SETMEM (self, cleanup, buffer->__prev); | |
69 | ||
70 | int cancelhandling; | |
71 | if (__builtin_expect (buffer->__canceltype != PTHREAD_CANCEL_DEFERRED, 0) | |
72 | && ((cancelhandling = THREAD_GETMEM (self, cancelhandling)) | |
73 | & CANCELTYPE_BITMASK) == 0) | |
74 | { | |
75 | while (1) | |
76 | { | |
77 | int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, | |
78 | cancelhandling | |
79 | | CANCELTYPE_BITMASK, | |
80 | cancelhandling); | |
a1ffb40e | 81 | if (__glibc_likely (curval == cancelhandling)) |
6efd4814 UD |
82 | /* Successfully replaced the value. */ |
83 | break; | |
84 | ||
85 | /* Prepare for the next round. */ | |
86 | cancelhandling = curval; | |
87 | } | |
88 | ||
89 | CANCELLATION_P (self); | |
90 | } | |
91 | ||
92 | /* If necessary call the cleanup routine after we removed the | |
93 | current cleanup block from the list. */ | |
94 | if (execute) | |
95 | buffer->__routine (buffer->__arg); | |
96 | } | |
97 | strong_alias (_pthread_cleanup_pop_restore, __pthread_cleanup_pop_restore) |