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Diffstat (limited to 'libpthread/sysdeps/generic/bits/memory.h')
| -rw-r--r-- | libpthread/sysdeps/generic/bits/memory.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/libpthread/sysdeps/generic/bits/memory.h b/libpthread/sysdeps/generic/bits/memory.h new file mode 100644 index 0000000..7b88a7e --- /dev/null +++ b/libpthread/sysdeps/generic/bits/memory.h @@ -0,0 +1,36 @@ +/* Memory barrier operations. Generic version. + Copyright (C) 2008 Free Software Foundation, Inc. + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 3 of the + License, or (at your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _BITS_MEMORY_H +#define _BITS_MEMORY_H 1 + +/* Prevent read and write reordering across this function. */ +static inline void +__memory_barrier (void) +{ + /* Any lock'ed instruction will do. */ + __sync_synchronize (); +} + +/* Prevent read reordering across this function. */ +#define __memory_read_barrier __memory_barrier + +/* Prevent write reordering across this function. */ +#define __memory_write_barrier __memory_barrier + +#endif |