1  /* Early initialization of libc.so, libc.so side.
       2     Copyright (C) 2020-2023 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  #include <ctype.h>
      20  #include <elision-conf.h>
      21  #include <libc-early-init.h>
      22  #include <libc-internal.h>
      23  #include <lowlevellock.h>
      24  #include <pthread_early_init.h>
      25  #include <sys/single_threaded.h>
      26  
      27  #ifdef SHARED
      28  _Bool __libc_initial;
      29  #endif
      30  
      31  void
      32  __libc_early_init (_Bool initial)
      33  {
      34    /* Initialize ctype data.  */
      35    __ctype_init ();
      36  
      37    /* Only the outer namespace is marked as single-threaded.  */
      38    __libc_single_threaded = initial;
      39  
      40  #ifdef SHARED
      41    __libc_single_threaded_internal = __libc_initial = initial;
      42  #endif
      43  
      44    __pthread_early_init ();
      45  
      46  #if ENABLE_ELISION_SUPPORT
      47    __lll_elision_init ();
      48  #endif
      49  }