1 /* Set the default attributes to be used by pthread_create in the process.
2 Copyright (C) 2013-2017 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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 <http://www.gnu.org/licenses/>. */
26 pthread_setattr_default_np (const pthread_attr_t
*in
)
28 const struct pthread_attr
*real_in
;
29 struct pthread_attr attrs
;
32 real_in
= (struct pthread_attr
*) in
;
34 /* Catch invalid values. */
35 int policy
= real_in
->schedpolicy
;
36 ret
= check_sched_policy_attr (policy
);
40 const struct sched_param
*param
= &real_in
->schedparam
;
41 if (param
->sched_priority
> 0)
43 ret
= check_sched_priority_attr (param
->sched_priority
, policy
);
48 /* stacksize == 0 is fine. It means that we don't change the current
50 if (real_in
->stacksize
!= 0)
52 ret
= check_stacksize_attr (real_in
->stacksize
);
57 /* Having a default stack address is wrong. */
58 if (real_in
->flags
& ATTR_FLAG_STACKADDR
)
63 /* Now take the lock because we start writing into
64 __default_pthread_attr. */
65 lll_lock (__default_pthread_attr_lock
, LLL_PRIVATE
);
67 /* Free the cpuset if the input is 0. Otherwise copy in the cpuset
69 size_t cpusetsize
= attrs
.cpusetsize
;
72 free (__default_pthread_attr
.cpuset
);
73 __default_pthread_attr
.cpuset
= NULL
;
75 else if (cpusetsize
== __default_pthread_attr
.cpusetsize
)
77 attrs
.cpuset
= __default_pthread_attr
.cpuset
;
78 memcpy (attrs
.cpuset
, real_in
->cpuset
, cpusetsize
);
82 /* This may look wrong at first sight, but it isn't. We're freeing
83 __default_pthread_attr.cpuset and allocating to attrs.cpuset because
84 we'll copy over all of attr to __default_pthread_attr later. */
85 cpu_set_t
*newp
= realloc (__default_pthread_attr
.cpuset
,
95 memcpy (attrs
.cpuset
, real_in
->cpuset
, cpusetsize
);
98 /* We don't want to accidentally set the default stacksize to zero. */
99 if (attrs
.stacksize
== 0)
100 attrs
.stacksize
= __default_pthread_attr
.stacksize
;
101 __default_pthread_attr
= attrs
;
104 lll_unlock (__default_pthread_attr_lock
, LLL_PRIVATE
);