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

   1 /* Copyright (C) 2003-2017 Free Software Foundation, Inc.
   2
   3    The GNU C Library is free software; you can redistribute it and/or
   4    modify it under the terms of the GNU Lesser General Public
   5    License as published by the Free Software Foundation; either
   6    version 2.1 of the License, or (at your option) any later version.
   7
   8    The GNU C Library is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11    Lesser General Public License for more details.
  12
  13    You should have received a copy of the GNU Lesser General Public
  14    License along with the GNU C Library; if not, see
  15    <http://www.gnu.org/licenses/>.  */
  16
  17 #include <sysdep.h>
  18 #include <tcb-offsets.h>
  19 #ifndef __ASSEMBLER__
  20 # include <pthreadP.h>
  21 #endif
  22
  23 #if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
  24
  25 # ifdef IS_IN_libpthread
  26 #  define __local_multiple_threads __pthread_multiple_threads
  27 # elif !defined NOT_IN_libc
  28 #  define __local_multiple_threads __libc_multiple_threads
  29 # endif
  30
  31 # if defined IS_IN_libpthread || !defined NOT_IN_libc
  32 extern int __local_multiple_threads attribute_hidden;
  33 #  define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
  34 # else
  35 /*  There is no __local_multiple_threads for librt, so use the TCB.  */
  36 #  define SINGLE_THREAD_P                                               \
  37   __builtin_expect (THREAD_GETMEM (THREAD_SELF,                         \
  38                                    header.multiple_threads) == 0, 1)
  39 # endif
  40
  41 #else
  42
  43 /* For rtld, et cetera.  */
  44 # define SINGLE_THREAD_P 1
  45 # define NO_CANCELLATION 1
  46
  47 #endif
  48
  49 #define RTLD_SINGLE_THREAD_P \
  50   __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
  51                                    header.multiple_threads) == 0, 1)