1  /* __get_pthread_stack_min ().  Linux version.
       2     Copyright (C) 2021-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  /* Return sysconf (_SC_THREAD_STACK_MIN).  */
      20  
      21  static inline long int
      22  __get_pthread_stack_min (void)
      23  {
      24    /* sysconf (_SC_THREAD_STACK_MIN) >= sysconf (_SC_MINSIGSTKSZ).  */
      25    long int pthread_stack_min = GLRO(dl_minsigstacksize);
      26    assert (pthread_stack_min != 0);
      27    _Static_assert (__builtin_constant_p (PTHREAD_STACK_MIN),
      28  		  "PTHREAD_STACK_MIN is constant");
      29    /* Return MAX (PTHREAD_STACK_MIN, pthread_stack_min).  */
      30    if (pthread_stack_min < PTHREAD_STACK_MIN)
      31      pthread_stack_min = PTHREAD_STACK_MIN;
      32    /* We have a private interface, __pthread_get_minstack@GLIBC_PRIVATE
      33       which returns a larger size that includes the required TLS variable
      34       space which has been determined at startup.  For sysconf here we are
      35       conservative and don't include the space required for TLS access.
      36       Eventually the TLS variable space will not be part of the stack
      37       (Bug 11787).  */
      38    return pthread_stack_min;
      39  }