nptl/libc_multiple_threads.c

   1 /* Copyright (C) 2002-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <pthreadP.h>
  19
  20 #if IS_IN (libc)
  21 # ifndef TLS_MULTIPLE_THREADS_IN_TCB
  22 /* Variable set to a nonzero value either if more than one thread runs or ran,
  23    or if a single-threaded process is trying to cancel itself.  See
  24    nptl/descr.h for more context on the single-threaded process case.  */
  25 int __libc_multiple_threads;
  26 libc_hidden_data_def (__libc_multiple_threads)
  27 # endif
  28 #endif