1 /* Thread attributes retrieval.
2 Copyright (C) 2008-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <assert.h>
20 #include <errno.h>
21 #include <pthread.h>
22
23 #include <pt-internal.h>
24
25 /* Initialize thread attribute *ATTR with attributes corresponding to the
26 already running thread THREAD. It shall be called on an uninitialized ATTR
27 and destroyed with pthread_attr_destroy when no longer needed. */
28 int
__pthread_getattr_np(pthread_t thread,pthread_attr_t * attr)29 __pthread_getattr_np (pthread_t thread, pthread_attr_t *attr)
30 {
31 struct __pthread *pthread;
32
33 pthread = __pthread_getid (thread);
34 if (pthread == NULL)
35 return ESRCH;
36
37 /* Some attributes (schedparam, inheritsched, contentionscope and schedpolicy)
38 are not supported yet, so fill them with our default values. */
39 *attr = __pthread_default_attr;
40
41 attr->__stackaddr = (pthread->stackaddr
42 + ((pthread->guardsize + __vm_page_size - 1)
43 / __vm_page_size * __vm_page_size));
44 attr->__stacksize = pthread->stacksize;
45 attr->__guardsize = pthread->guardsize;
46 attr->__detachstate = (pthread->state == PTHREAD_DETACHED
47 ? PTHREAD_CREATE_DETACHED : PTHREAD_CREATE_JOINABLE);
48
49 return 0;
50 }
51 weak_alias (__pthread_getattr_np, pthread_getattr_np)
52