diff options
| author | Neal H. Walfield <neal@gnu.org> | 2008-12-17 15:10:59 +0100 |
|---|---|---|
| committer | Neal H. Walfield <neal@gnu.org> | 2008-12-17 15:10:59 +0100 |
| commit | f1f8715a2fc8473ed4b806182fbb858f9f1c9b43 (patch) | |
| tree | 127c7e34596ded785f61246731d3f0a7a64f96df | |
| parent | 326af31495882335c1f464abb7759df3bb4e3b82 (diff) | |
Add a generic memory.h file based on gcc's __sync functions.
libpthread/
2008-12-17 Neal H. Walfield <neal@gnu.org>
* sysdeps/generic/bits/memory.h: New file.
| -rw-r--r-- | libpthread/ChangeLog | 4 | ||||
| -rw-r--r-- | libpthread/sysdeps/generic/bits/memory.h | 36 |
2 files changed, 40 insertions, 0 deletions
diff --git a/libpthread/ChangeLog b/libpthread/ChangeLog index 8afbae0..ac4abc6 100644 --- a/libpthread/ChangeLog +++ b/libpthread/ChangeLog @@ -1,5 +1,9 @@ 2008-12-17 Neal H. Walfield <neal@gnu.org> + * sysdeps/generic/bits/memory.h: New file. + +2008-12-17 Neal H. Walfield <neal@gnu.org> + * signal/signal-dispatch.c: Include <viengoos/math.h>. (signal_dispatch): Use vg_lsb64, not l4_lsb64. * sysdeps/viengoos/pt-sigstate.c (__pthread_sigstate): Likewise. 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 |