1 /* Set the default attributes to be used by pthread_create in the process.
2 Copyright (C) 2013-2015 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/>. */
24 #include <check-cpuset.h>
28 pthread_setattr_default_np (const pthread_attr_t *in)
30 const struct pthread_attr *real_in;
31 struct pthread_attr attrs;
34 assert (sizeof (*in) >= sizeof (struct pthread_attr));
35 real_in = (struct pthread_attr *) in;
37 /* Catch invalid values. */
38 int policy = real_in->schedpolicy;
39 ret = check_sched_policy_attr (policy);
43 const struct sched_param *param = &real_in->schedparam;
44 if (param->sched_priority > 0)
46 ret = check_sched_priority_attr (param->sched_priority, policy);
51 ret = check_cpuset_attr (real_in->cpuset, real_in->cpusetsize);
55 /* stacksize == 0 is fine. It means that we don't change the current
57 if (real_in->stacksize != 0)
59 ret = check_stacksize_attr (real_in->stacksize);
64 /* Having a default stack address is wrong. */
65 if (real_in->flags & ATTR_FLAG_STACKADDR)
70 /* Now take the lock because we start writing into
71 __default_pthread_attr. */
72 lll_lock (__default_pthread_attr_lock, LLL_PRIVATE);
74 /* Free the cpuset if the input is 0. Otherwise copy in the cpuset
76 size_t cpusetsize = attrs.cpusetsize;
79 free (__default_pthread_attr.cpuset);
80 __default_pthread_attr.cpuset = NULL;
82 else if (cpusetsize == __default_pthread_attr.cpusetsize)
84 attrs.cpuset = __default_pthread_attr.cpuset;
85 memcpy (attrs.cpuset, real_in->cpuset, cpusetsize);
89 /* This may look wrong at first sight, but it isn't. We're freeing
90 __default_pthread_attr.cpuset and allocating to attrs.cpuset because
91 we'll copy over all of attr to __default_pthread_attr later. */
92 cpu_set_t *newp = realloc (__default_pthread_attr.cpuset,
102 memcpy (attrs.cpuset, real_in->cpuset, cpusetsize);
105 /* We don't want to accidentally set the default stacksize to zero. */
106 if (attrs.stacksize == 0)
107 attrs.stacksize = __default_pthread_attr.stacksize;
108 __default_pthread_attr = attrs;
111 lll_unlock (__default_pthread_attr_lock, LLL_PRIVATE);