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62 lines
2.3 KiB
C
62 lines
2.3 KiB
C
/* pthread initialization called from __libc_early_init. NPTL version.
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Copyright (C) 2021-2023 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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#ifndef _PTHREAD_EARLY_INIT_H
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#define _PTHREAD_EARLY_INIT_H 1
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#include <nptl/nptl-stack.h>
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#include <pthreadP.h>
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#include <pthread_mutex_conf.h>
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#include <sys/resource.h>
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static inline void
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__pthread_early_init (void)
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{
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/* Determine the default allowed stack size. This is the size used
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in case the user does not specify one. */
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struct rlimit limit;
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if (__getrlimit (RLIMIT_STACK, &limit) != 0
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|| limit.rlim_cur == RLIM_INFINITY)
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/* The system limit is not usable. Use an architecture-specific
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default. */
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limit.rlim_cur = ARCH_STACK_DEFAULT_SIZE;
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else if (limit.rlim_cur < PTHREAD_STACK_MIN)
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/* The system limit is unusably small.
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Use the minimal size acceptable. */
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limit.rlim_cur = PTHREAD_STACK_MIN;
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/* Make sure it meets the minimum size that allocate_stack
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(allocatestack.c) will demand, which depends on the page size. */
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const uintptr_t pagesz = GLRO(dl_pagesize);
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const size_t minstack = (pagesz + __nptl_tls_static_size_for_stack ()
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+ MINIMAL_REST_STACK);
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if (limit.rlim_cur < minstack)
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limit.rlim_cur = minstack;
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/* Round the resource limit up to page size. */
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limit.rlim_cur = ALIGN_UP (limit.rlim_cur, pagesz);
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__default_pthread_attr.internal.stacksize = limit.rlim_cur;
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__default_pthread_attr.internal.guardsize = GLRO (dl_pagesize);
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#if HAVE_TUNABLES
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__pthread_tunables_init ();
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#endif
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}
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#endif /* _PTHREAD_EARLY_INIT_H */
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