sysdeps/s390/nptl/pthread_spin_unlock.c

   1 /* Copyright (C) 2003-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
   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 /* Ugly hack to avoid the declaration of pthread_spin_init.  */
  20 #define pthread_spin_init pthread_spin_init_XXX
  21 #include "pthreadP.h"
  22 #undef pthread_spin_init
  23
  24 int
  25 pthread_spin_unlock (pthread_spinlock_t *lock)
  26 {
  27   __asm__ __volatile__ ("   xc  %O0(4,%R0),%0\n"
  28                         "   bcr 15,0"
  29                         : "=Q" (*lock) : "m" (*lock) : "cc" );
  30   return 0;
  31 }
  32 strong_alias (pthread_spin_unlock, pthread_spin_init)