100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
/* Set the default attributes to be used by pthread_create in the process.
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Copyright (C) 2013-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdlib.h>
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#include <pthreadP.h>
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#include <string.h>
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#include <shlib-compat.h>
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int
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__pthread_setattr_default_np (const pthread_attr_t *in)
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{
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const struct pthread_attr *real_in;
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int ret;
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real_in = (struct pthread_attr *) in;
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/* Catch invalid values. */
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int policy = real_in->schedpolicy;
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ret = check_sched_policy_attr (policy);
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if (ret)
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return ret;
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const struct sched_param *param = &real_in->schedparam;
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if (param->sched_priority > 0)
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{
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ret = check_sched_priority_attr (param->sched_priority, policy);
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if (ret)
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return ret;
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}
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/* stacksize == 0 is fine. It means that we don't change the current
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value. */
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if (real_in->stacksize != 0)
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{
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ret = check_stacksize_attr (real_in->stacksize);
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if (ret)
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return ret;
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}
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/* Having a default stack address is wrong. */
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if (real_in->flags & ATTR_FLAG_STACKADDR)
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return EINVAL;
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union pthread_attr_transparent temp;
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ret = __pthread_attr_copy (&temp.external, in);
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if (ret != 0)
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return ret;
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/* Now take the lock because we start accessing
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__default_pthread_attr. */
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lll_lock (__default_pthread_attr_lock, LLL_PRIVATE);
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/* Preserve the previous stack size (see above). */
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if (temp.internal.stacksize == 0)
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temp.internal.stacksize = __default_pthread_attr.internal.stacksize;
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/* Destroy the old attribute structure because it will be
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overwritten. */
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__pthread_attr_destroy (&__default_pthread_attr.external);
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/* __default_pthread_attr takes ownership, so do not free
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attrs.internal after this point. */
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__default_pthread_attr = temp;
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lll_unlock (__default_pthread_attr_lock, LLL_PRIVATE);
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return ret;
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}
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versioned_symbol (libc, __pthread_setattr_default_np,
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pthread_setattr_default_np, GLIBC_2_34);
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#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_18, GLIBC_2_34)
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compat_symbol (libc, __pthread_setattr_default_np,
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pthread_setattr_default_np, GLIBC_2_18);
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#endif
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/* This is placed in the same file as pthread_setattr_default_np
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because only this function can trigger allocation of attribute
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data. This way, the function is automatically defined for all the
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cases when it is needed in static builds. */
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void
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__default_pthread_attr_freeres (void)
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{
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__pthread_attr_destroy (&__default_pthread_attr.external);
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}
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