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diff --git a/dol/src/dol/visitor/protothread/lib/dol.h b/dol/src/dol/visitor/protothread/lib/dol.h
new file mode 100644
index 0000000..8fbefe4
--- /dev/null
+++ b/dol/src/dol/visitor/protothread/lib/dol.h
@@ -0,0 +1,39 @@
+#ifndef DOL_H
+#define DOL_H
+
+/************************************************************************
+ * do not add code to this header
+ ************************************************************************/
+
+/**
+ *  Define the DOL process handler scheme.
+ *  - Local variables are defined in structure LocalState. Local
+ *    variables may vary from different processes.
+ *  - The ProcessInit function pointer points to a function which
+ *    initializes a process.
+ *  - The ProcessFire function pointer points to a function which
+ *    performs the actual computation. The communication between
+ *    processes is inside the ProcessFire function.
+ *  - The WPTR is a placeholder for callback. One can just
+ *    leave it blank.
+ */
+
+//structure for local memory of process
+typedef struct _local_states *LocalState;
+
+//additional behavioral functions could be declared here
+typedef void (*ProcessInit)(struct _process*);
+typedef int (*ProcessFire)(struct _process*);
+typedef void *WPTR;
+
+//process handler
+struct _process;
+
+typedef struct _process {
+    LocalState     local;
+    ProcessInit    init;
+    ProcessFire    fire;
+    WPTR           wptr; //placeholder for wrapper instance
+} DOLProcess;
+
+#endif