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
|
/* Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
OpenSolaris bits contributed by David Bartley
<dtbartle@csclub.uwaterloo.ca>, 2008.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/* We define a special synchronization primitive for AIO. POSIX
conditional variables would be ideal but the pthread_cond_*wait
operations do not return on EINTR. This is a requirement for
correct aio_suspend and lio_listio implementations. */
#include <assert.h>
#include <signal.h>
#include <pthreadP.h>
#undef DONT_NEED_GAI_MISC_COND
#define gai_start_notify_thread __gai_start_notify_thread
#define gai_create_helper_thread __gai_create_helper_thread
extern inline void
__gai_start_notify_thread (void)
{
sigset_t ss;
sigemptyset (&ss);
sigprocmask (SIG_SETMASK, &ss, NULL);
}
extern inline int
__gai_create_helper_thread (pthread_t *threadp, void *(*tf) (void *),
void *arg)
{
pthread_attr_t attr;
/* Make sure the thread is created detached. */
pthread_attr_init (&attr);
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
/* The helper thread needs only very little resources. */
(void) pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);
/* Block all signals in the helper thread. To do this thoroughly we
temporarily have to block all signals here. */
sigset_t ss;
sigset_t oss;
sigfillset (&ss);
sigprocmask (SIG_SETMASK, &ss, &oss);
int ret = pthread_create (threadp, &attr, tf, arg);
/* Restore the signal mask. */
sigprocmask (SIG_SETMASK, &oss, NULL);
(void) pthread_attr_destroy (&attr);
return ret;
}
#include <resolv/gai_misc.h>
|
