elf/libc_early_init.c

   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 }