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bfff8b1b | 1 | /* Copyright (C) 2002-2017 Free Software Foundation, Inc. |
76a50749 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/>. */ | |
76a50749 | 18 | |
6efd4814 | 19 | #include <stdlib.h> |
76a50749 | 20 | #include "pthreadP.h" |
76a50749 UD |
21 | |
22 | ||
23 | void | |
6efd4814 UD |
24 | __cleanup_fct_attribute |
25 | __pthread_register_cancel_defer (__pthread_unwind_buf_t *buf) | |
76a50749 | 26 | { |
6efd4814 | 27 | struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf; |
76a50749 UD |
28 | struct pthread *self = THREAD_SELF; |
29 | ||
6efd4814 UD |
30 | /* Store old info. */ |
31 | ibuf->priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf); | |
32 | ibuf->priv.data.cleanup = THREAD_GETMEM (self, cleanup); | |
76a50749 | 33 | |
76a50749 UD |
34 | int cancelhandling = THREAD_GETMEM (self, cancelhandling); |
35 | ||
36 | /* Disable asynchronous cancellation for now. */ | |
a1ffb40e | 37 | if (__glibc_unlikely (cancelhandling & CANCELTYPE_BITMASK)) |
b22d701b UD |
38 | while (1) |
39 | { | |
6efd4814 | 40 | int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, |
b22d701b UD |
41 | cancelhandling |
42 | & ~CANCELTYPE_BITMASK, | |
43 | cancelhandling); | |
a1ffb40e | 44 | if (__glibc_likely (curval == cancelhandling)) |
b22d701b UD |
45 | /* Successfully replaced the value. */ |
46 | break; | |
47 | ||
48 | /* Prepare for the next round. */ | |
6efd4814 | 49 | cancelhandling = curval; |
b22d701b | 50 | } |
76a50749 | 51 | |
6efd4814 UD |
52 | ibuf->priv.data.canceltype = (cancelhandling & CANCELTYPE_BITMASK |
53 | ? PTHREAD_CANCEL_ASYNCHRONOUS | |
54 | : PTHREAD_CANCEL_DEFERRED); | |
76a50749 | 55 | |
6efd4814 | 56 | /* Store the new cleanup handler info. */ |
49b65043 | 57 | THREAD_SETMEM (self, cleanup_jmp_buf, (struct pthread_unwind_buf *) buf); |
76a50749 | 58 | } |
76a50749 | 59 | |
b22d701b | 60 | |
76a50749 | 61 | void |
6efd4814 UD |
62 | __cleanup_fct_attribute |
63 | __pthread_unregister_cancel_restore (__pthread_unwind_buf_t *buf) | |
76a50749 UD |
64 | { |
65 | struct pthread *self = THREAD_SELF; | |
6efd4814 | 66 | struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf; |
76a50749 | 67 | |
6efd4814 | 68 | THREAD_SETMEM (self, cleanup_jmp_buf, ibuf->priv.data.prev); |
76a50749 UD |
69 | |
70 | int cancelhandling; | |
6efd4814 | 71 | if (ibuf->priv.data.canceltype != PTHREAD_CANCEL_DEFERRED |
76a50749 UD |
72 | && ((cancelhandling = THREAD_GETMEM (self, cancelhandling)) |
73 | & CANCELTYPE_BITMASK) == 0) | |
74 | { | |
b22d701b UD |
75 | while (1) |
76 | { | |
6efd4814 | 77 | int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, |
b22d701b UD |
78 | cancelhandling |
79 | | CANCELTYPE_BITMASK, | |
80 | cancelhandling); | |
a1ffb40e | 81 | if (__glibc_likely (curval == cancelhandling)) |
b22d701b UD |
82 | /* Successfully replaced the value. */ |
83 | break; | |
84 | ||
85 | /* Prepare for the next round. */ | |
6efd4814 | 86 | cancelhandling = curval; |
b22d701b | 87 | } |
76a50749 UD |
88 | |
89 | CANCELLATION_P (self); | |
90 | } | |
76a50749 | 91 | } |