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