Add the file that prev commit forget.

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diff --git a/gdb/python/py-events.h b/gdb/python/py-events.h
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+/* Python interface to inferior events.
+
+   Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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 3 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, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef GDB_PY_EVENTS_H
+#define GDB_PY_EVENTS_H
+
+#include "defs.h"
+#include "command.h"
+#include "python-internal.h"
+#include "inferior.h"
+
+extern PyTypeObject thread_event_object_type;
+
+/* Stores a list of objects to be notified when the event for which this
+   registry tracks occurs.  */
+
+typedef struct
+{
+  PyObject_HEAD
+
+  PyObject *callbacks;
+} eventregistry_object;
+
+/* Struct holding references to event registries both in python and c.
+   This is meant to be a singleton.  */
+
+typedef struct
+{
+  eventregistry_object *stop;
+  eventregistry_object *cont;
+  eventregistry_object *exited;
+
+  PyObject *module;
+
+} events_object;
+
+/* Python events singleton.  */
+events_object gdb_py_events;
+
+extern eventregistry_object *create_eventregistry_object (void);
+extern int evregpy_no_listeners_p (eventregistry_object *registry);
+
+#endif /* GDB_PY_EVENTS_H */