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/* Set the default attributes to be used by pthread_create in the process.
Copyright (C) 2013-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdlib.h>
#include <pthreadP.h>
#include <string.h>
#include <shlib-compat.h>
int
__pthread_setattr_default_np (const pthread_attr_t *in)
{
const struct pthread_attr *real_in;
int ret;
real_in = (struct pthread_attr *) in;
/* Catch invalid values. */
int policy = real_in->schedpolicy;
ret = check_sched_policy_attr (policy);
if (ret)
return ret;
const struct sched_param *param = &real_in->schedparam;
if (param->sched_priority > 0)
{
ret = check_sched_priority_attr (param->sched_priority, policy);
if (ret)
return ret;
}
/* stacksize == 0 is fine. It means that we don't change the current
value. */
if (real_in->stacksize != 0)
{
ret = check_stacksize_attr (real_in->stacksize);
if (ret)
return ret;
}
/* Having a default stack address is wrong. */
if (real_in->flags & ATTR_FLAG_STACKADDR)
return EINVAL;
union pthread_attr_transparent temp;
ret = __pthread_attr_copy (&temp.external, in);
if (ret != 0)
return ret;
/* Now take the lock because we start accessing
__default_pthread_attr. */
lll_lock (__default_pthread_attr_lock, LLL_PRIVATE);
/* Preserve the previous stack size (see above). */
if (temp.internal.stacksize == 0)
temp.internal.stacksize = __default_pthread_attr.internal.stacksize;
/* Destroy the old attribute structure because it will be
overwritten. */
__pthread_attr_destroy (&__default_pthread_attr.external);
/* __default_pthread_attr takes ownership, so do not free
attrs.internal after this point. */
__default_pthread_attr = temp;
lll_unlock (__default_pthread_attr_lock, LLL_PRIVATE);
return ret;
}
versioned_symbol (libc, __pthread_setattr_default_np,
pthread_setattr_default_np, GLIBC_2_34);
#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_18, GLIBC_2_34)
compat_symbol (libc, __pthread_setattr_default_np,
pthread_setattr_default_np, GLIBC_2_18);
#endif
/* This is placed in the same file as pthread_setattr_default_np
because only this function can trigger allocation of attribute
data. This way, the function is automatically defined for all the
cases when it is needed in static builds. */
void
__default_pthread_attr_freeres (void)
{
__pthread_attr_destroy (&__default_pthread_attr.external);
}
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