libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sysdep-cancel.h

   1 /* Copyright (C) 2002-2017 Free Software Foundation, Inc.
   2    Contributed by Jakub Jelinek <jakub@redhat.com>, 2002.
   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    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdep.h>
  19 #include <tls.h>
  20 #ifndef __ASSEMBLER__
  21 # include <pthreadP.h>
  22 #endif
  23
  24 #if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
  25
  26 # ifdef IS_IN_libpthread
  27 #  define __local_multiple_threads __pthread_multiple_threads
  28 # elif !defined NOT_IN_libc
  29 #  define __local_multiple_threads __libc_multiple_threads
  30 # endif
  31
  32 # if defined IS_IN_libpthread || !defined NOT_IN_libc
  33 extern int __local_multiple_threads attribute_hidden;
  34 #  define SINGLE_THREAD_P \
  35   __builtin_expect (__local_multiple_threads == 0, 1)
  36
  37 # else
  38
  39 #   define SINGLE_THREAD_P \
  40   __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
  41                                    header.multiple_threads) == 0, 1)
  42 # endif
  43
  44 #else
  45
  46 # define SINGLE_THREAD_P (1)
  47 # define NO_CANCELLATION 1
  48
  49 #endif
  50
  51 # define RTLD_SINGLE_THREAD_P \
  52   __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
  53                                    header.multiple_threads) == 0, 1)