1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/* Copyright (C) 2002-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "pthreadP.h"
#include <tls.h>
#include <libc-lock.h>
void
__libc_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer)
{
struct pthread *self = THREAD_SELF;
buffer->__prev = THREAD_GETMEM (self, cleanup);
int cancelhandling = atomic_load_relaxed (&self->cancelhandling);
/* Disable asynchronous cancellation for now. */
if (__glibc_unlikely (cancelhandling & CANCELTYPE_BITMASK))
{
int newval;
do
{
newval = cancelhandling & ~CANCELTYPE_BITMASK;
}
while (!atomic_compare_exchange_weak_acquire (&self->cancelhandling,
&cancelhandling,
newval));
}
buffer->__canceltype = (cancelhandling & CANCELTYPE_BITMASK
? PTHREAD_CANCEL_ASYNCHRONOUS
: PTHREAD_CANCEL_DEFERRED);
THREAD_SETMEM (self, cleanup, buffer);
}
libc_hidden_def (__libc_cleanup_push_defer)
void
__libc_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer)
{
struct pthread *self = THREAD_SELF;
THREAD_SETMEM (self, cleanup, buffer->__prev);
int cancelhandling = atomic_load_relaxed (&self->cancelhandling);
if (cancelhandling & CANCELTYPE_BITMASK)
{
int newval;
do
{
newval = cancelhandling | CANCELTYPE_BITMASK;
}
while (!atomic_compare_exchange_weak_acquire (&self->cancelhandling,
&cancelhandling, newval));
if (cancel_enabled_and_canceled (cancelhandling))
{
self->result = PTHREAD_CANCELED;
__do_cancel ();
}
}
}
libc_hidden_def (__libc_cleanup_pop_restore)
|
