1 files changed, 59 insertions, 0 deletions
diff --git a/datapath/linux-2.6/compat-2.6/include/linux/mutex.h b/datapath/linux-2.6/compat-2.6/include/linux/mutex.h
new file mode 100644
index 000000000..93dfa3b2b
--- /dev/null
+++ b/datapath/linux-2.6/compat-2.6/include/linux/mutex.h
@@ -0,0 +1,59 @@
+#ifndef __LINUX_MUTEX_WRAPPER_H
+#define __LINUX_MUTEX_WRAPPER_H
+
+
+#include <linux/version.h>
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16)
+
+#include <asm/semaphore.h>
+
+struct mutex {
+	struct semaphore sema;
+};
+
+#define mutex_init(mutex) init_MUTEX(&(mutex)->sema)
+#define mutex_destroy(mutex) do { } while (0)
+
+#define __MUTEX_INITIALIZER(name) \
+			__SEMAPHORE_INITIALIZER(name,1)
+
+#define DEFINE_MUTEX(mutexname) \
+	struct mutex mutexname = { __MUTEX_INITIALIZER(mutexname.sema) }
+
+/*
+ * See kernel/mutex.c for detailed documentation of these APIs.
+ * Also see Documentation/mutex-design.txt.
+ */
+static inline void mutex_lock(struct mutex *lock)
+{
+	down(&lock->sema);
+}
+
+static inline int mutex_lock_interruptible(struct mutex *lock)
+{
+	return down_interruptible(&lock->sema);
+}
+
+#define mutex_lock_nested(lock, subclass) mutex_lock(lock)
+#define mutex_lock_interruptible_nested(lock, subclass) mutex_lock_interruptible(lock)
+
+/*
+ * NOTE: mutex_trylock() follows the spin_trylock() convention,
+ *       not the down_trylock() convention!
+ */
+static inline int mutex_trylock(struct mutex *lock)
+{
+	return !down_trylock(&lock->sema);
+}
+
+static inline void mutex_unlock(struct mutex *lock)
+{
+	up(&lock->sema);
+}
+#else 
+
+#include_next <linux/mutex.h>
+
+#endif /* linux version < 2.6.16 */
+
+#endif