sysdeps/unix/sysv/linux/s390/force-elision.h

   1 /* Automatic enabling of elision for mutexes
   2    Copyright (C) 2014-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifdef ENABLE_LOCK_ELISION
  20 /* Automatically enable elision for existing user lock kinds.  */
  21 #define FORCE_ELISION(m, s)                                             \
  22   if (__pthread_force_elision                                           \
  23       && (m->__data.__kind & PTHREAD_MUTEX_ELISION_FLAGS_NP) == 0)      \
  24     {                                                                   \
  25       mutex->__data.__kind |= PTHREAD_MUTEX_ELISION_NP;                 \
  26       s;                                                                \
  27     }
  28 #endif