Add atomic.h wrapper for before/after atomic

[lttng-modules.git] / wrapper / atomic.h

diff --git a/wrapper/atomic.h b/wrapper/atomic.h
new file mode 100644 (file)
index 0000000..6a3cd07
--- /dev/null
+++ b/wrapper/atomic.h
@@ -0,0 +1,51 @@
+#ifndef _LTTNG_WRAPPER_ATOMIC_H
+#define _LTTNG_WRAPPER_ATOMIC_H
+
+/*
+ * wrapper/atomic.h
+ *
+ * wrapper around linux/atomic.h.
+ *
+ * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/version.h>
+#include <linux/atomic.h>
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0))
+static inline void lttng_smp_mb__before_atomic(void)
+{
+       smp_mb__before_atomic();
+}
+
+static inline void lttng_smp_mb__after_atomic(void)
+{
+       smp_mb__after_atomic();
+}
+#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)) */
+static inline void lttng_smp_mb__before_atomic(void)
+{
+       smp_mb__before_atomic_inc();
+}
+
+static inline void lttng_smp_mb__after_atomic(void)
+{
+       smp_mb__after_atomic_inc();
+}
+#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)) */
+
+#endif /* _LTTNG_WRAPPER_ATOMIC_H */