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1 | /* Copyright (C) 2006-2022 Free Software Foundation, Inc. |
---|---|
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <assert.h> |
19 | #include <signal.h> |
20 | #include <pthread.h> |
21 | |
22 | #define gai_start_notify_thread __gai_start_notify_thread |
23 | #define gai_create_helper_thread __gai_create_helper_thread |
24 | |
25 | extern inline void |
26 | __gai_start_notify_thread (void) |
27 | { |
28 | sigset_t ss; |
29 | sigemptyset (&ss); |
30 | int sigerr __attribute__ ((unused)); |
31 | sigerr = pthread_sigmask (SIG_SETMASK, &ss, NULL); |
32 | assert_perror (sigerr); |
33 | } |
34 | |
35 | extern inline int |
36 | __gai_create_helper_thread (pthread_t *threadp, void *(*tf) (void *), |
37 | void *arg) |
38 | { |
39 | pthread_attr_t attr; |
40 | |
41 | /* Make sure the thread is created detached. */ |
42 | pthread_attr_init (&attr); |
43 | pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
44 | |
45 | /* The helper thread needs only very little resources. */ |
46 | (void) pthread_attr_setstacksize (&attr, 0x10000); |
47 | |
48 | /* Block all signals in the helper thread. To do this thoroughly we |
49 | temporarily have to block all signals here. */ |
50 | sigset_t ss; |
51 | sigset_t oss; |
52 | sigfillset (&ss); |
53 | int sigerr __attribute__ ((unused)); |
54 | sigerr = pthread_sigmask (SIG_SETMASK, &ss, &oss); |
55 | assert_perror (sigerr); |
56 | |
57 | int ret = pthread_create (threadp, &attr, tf, arg); |
58 | |
59 | /* Restore the signal mask. */ |
60 | sigerr = pthread_sigmask (SIG_SETMASK, &oss, NULL); |
61 | assert_perror (sigerr); |
62 | |
63 | (void) pthread_attr_destroy (&attr); |
64 | return ret; |
65 | } |
66 | |
67 | #include_next <gai_misc.h> |
68 |
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