WL#2595 - atomic operations

BitKeeper/etc/ignore:
  Added mysys/test_atomic to the ignore list

1 files changed, 46 insertions, 0 deletions

diff --git a/mysys/my_atomic.c b/mysys/my_atomic.c
new file mode 100644
index 00000000000..21b80f0f6a1
--- /dev/null
+++ b/mysys/my_atomic.c
@@ -0,0 +1,46 @@
+/* Copyright (C) 2006 MySQL AB
+
+   This program 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 2 of the License, or
+   (at your option) any later version.
+
+   This program 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#include <my_global.h>
+#include <my_pthread.h>
+
+#ifndef HAVE_INLINE
+/*
+  the following will cause all inline functions to be instantiated
+*/
+#define HAVE_INLINE
+#define static extern
+#endif
+
+#include <my_atomic.h>
+
+/*
+  checks that the current build of atomic ops
+  can run on this machine
+
+  RETURN
+    ATOMIC_xxx values, see my_atomic.h
+*/
+int my_atomic_initialize()
+{
+  /* currently the only thing worth checking is SMP/UP issue */
+#ifdef MY_ATOMIC_MODE_DUMMY
+  return my_getncpus() == 1 ? MY_ATOMIC_OK : MY_ATOMIC_NOT_1CPU;
+#else
+  return MY_ATOMIC_OK;
+#endif
+}
+