nptl/vars.c

   1 /* Copyright (C) 2004-2020 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 #include <stdlib.h>
  20 #include <tls.h>
  21 #include <unistd.h>
  22
  23 /* Default thread attributes for the case when the user does not
  24    provide any.  */
  25 union pthread_attr_transparent __default_pthread_attr attribute_hidden;
  26
  27 /* Mutex protecting __default_pthread_attr.  */
  28 int __default_pthread_attr_lock = LLL_LOCK_INITIALIZER;
  29
  30 /* Flag whether the machine is SMP or not.  */
  31 int __is_smp attribute_hidden;
  32
  33 #ifndef TLS_MULTIPLE_THREADS_IN_TCB
  34 /* Variable set to a nonzero value either if more than one thread runs or ran,
  35    or if a single-threaded process is trying to cancel itself.  See
  36    nptl/descr.h for more context on the single-threaded process case.  */
  37 int __pthread_multiple_threads attribute_hidden;
  38 #endif
  39
  40 /* Table of the key information.  */
  41 struct pthread_key_struct __pthread_keys[PTHREAD_KEYS_MAX]
  42   __attribute__ ((nocommon));
  43 hidden_data_def (__pthread_keys)