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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>
40 lines
1.7 KiB
C
40 lines
1.7 KiB
C
/* __get_pthread_stack_min (). Linux version.
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Copyright (C) 2021 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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/* Return sysconf (_SC_THREAD_STACK_MIN). */
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static inline long int
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__get_pthread_stack_min (void)
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{
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/* sysconf (_SC_THREAD_STACK_MIN) >= sysconf (_SC_MINSIGSTKSZ). */
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long int pthread_stack_min = GLRO(dl_minsigstacksize);
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assert (pthread_stack_min != 0);
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_Static_assert (__builtin_constant_p (PTHREAD_STACK_MIN),
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"PTHREAD_STACK_MIN is constant");
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/* Return MAX (PTHREAD_STACK_MIN, pthread_stack_min). */
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if (pthread_stack_min < PTHREAD_STACK_MIN)
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pthread_stack_min = PTHREAD_STACK_MIN;
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/* We have a private interface, __pthread_get_minstack@GLIBC_PRIVATE
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which returns a larger size that includes the required TLS variable
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space which has been determined at startup. For sysconf here we are
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conservative and don't include the space required for TLS access.
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Eventually the TLS variable space will not be part of the stack
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(Bug 11787). */
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return pthread_stack_min;
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}
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