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Define PTHREAD_STACK_MIN to sysconf(_SC_THREAD_STACK_MIN)

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The constant PTHREAD_STACK_MIN may be too small for some processors.
Rename _SC_SIGSTKSZ_SOURCE to _DYNAMIC_STACK_SIZE_SOURCE.  When
_DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined, define
PTHREAD_STACK_MIN to sysconf(_SC_THREAD_STACK_MIN) which is changed
to MIN (PTHREAD_STACK_MIN, sysconf(_SC_MINSIGSTKSZ)).

Consolidate <bits/local_lim.h> with <bits/pthread_stack_min.h> to
provide a constant target specific PTHREAD_STACK_MIN value.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
H.J. Lu
2021-06-21 12:42:56 -07:00
parent 7c241325d6
commit 5d98a7dae9
26 changed files with 266 additions and 626 deletions
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39
sysdeps/unix/sysv/linux/sysconf-pthread_stack_min.h Normal file
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/* __get_pthread_stack_min (). Linux 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/>. */
/* Return sysconf (_SC_THREAD_STACK_MIN). */
static inline long int
__get_pthread_stack_min (void)
{
/* sysconf (_SC_THREAD_STACK_MIN) >= sysconf (_SC_MINSIGSTKSZ). */
long int pthread_stack_min = GLRO(dl_minsigstacksize);
assert (pthread_stack_min != 0);
_Static_assert (__builtin_constant_p (PTHREAD_STACK_MIN),
"PTHREAD_STACK_MIN is constant");
/* Return MAX (PTHREAD_STACK_MIN, pthread_stack_min). */
if (pthread_stack_min < PTHREAD_STACK_MIN)
pthread_stack_min = PTHREAD_STACK_MIN;
/* We have a private interface, __pthread_get_minstack@GLIBC_PRIVATE
which returns a larger size that includes the required TLS variable
space which has been determined at startup. For sysconf here we are
conservative and don't include the space required for TLS access.
Eventually the TLS variable space will not be part of the stack
(Bug 11787). */
return pthread_stack_min;
}