nptl/libc_multiple_threads.c

   1 /* Copyright (C) 2002-2020 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   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 <pthreadP.h>
  20
  21 #if IS_IN (libc)
  22 # ifndef TLS_MULTIPLE_THREADS_IN_TCB
  23 /* Variable set to a nonzero value either if more than one thread runs or ran,
  24    or if a single-threaded process is trying to cancel itself.  See
  25    nptl/descr.h for more context on the single-threaded process case.  */
  26 int __libc_multiple_threads attribute_hidden;
  27 # endif
  28 #endif