sysdeps/hppa/nptl/pthread_spin_unlock.c

   1 /* Copyright (C) 2005 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  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 #if 0
  28   volatile unsigned int *a = __ldcw_align (lock);
  29 #endif
  30   int tmp = 0;
  31   /* This should be a memory barrier to newer compilers */
  32   __asm__ __volatile__ ("stw,ma %1,0(%0)"
  33                         : : "r" (lock), "r" (tmp) : "memory");
  34   return 0;
  35 }
  36 strong_alias (pthread_spin_unlock, pthread_spin_init)