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diff --git a/Source/DirectFB/lib/fusion/ref.h b/Source/DirectFB/lib/fusion/ref.h
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+/*
+   (c) Copyright 2001-2009  The world wide DirectFB Open Source Community (directfb.org)
+   (c) Copyright 2000-2004  Convergence (integrated media) GmbH
+
+   All rights reserved.
+
+   Written by Denis Oliver Kropp <dok@directfb.org>,
+              Andreas Hundt <andi@fischlustig.de>,
+              Sven Neumann <neo@directfb.org>,
+              Ville Syrjälä <syrjala@sci.fi> and
+              Claudio Ciccani <klan@users.sf.net>.
+
+   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; either
+   version 2 of the License, or (at your option) any later version.
+
+   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., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.
+*/
+
+#ifndef __FUSION__REF_H__
+#define __FUSION__REF_H__
+
+#include <pthread.h>
+
+#include <fusion/types.h>
+#include <fusion/call.h>
+#include <fusion/lock.h>
+
+typedef union {
+     /* multi app */
+     struct {
+          int                      id;
+          const FusionWorldShared *shared;
+          FusionID                 creator;
+          /* builtin impl */
+          struct {
+               int                 local;
+               int                 global;
+               FusionSkirmish      lock; 
+          
+               FusionCall         *call;
+               int                 call_arg;
+          } builtin;
+     } multi;
+     
+     /* single app */
+     struct {
+          int                      refs;
+          pthread_cond_t           cond;
+          pthread_mutex_t          lock;
+          bool                     destroyed;
+          int                      locked;
+
+          FusionCall              *call;
+          int                      call_arg;
+     } single;
+} FusionRef;
+
+/*
+ * Initialize.
+ */
+DirectResult fusion_ref_init         (FusionRef         *ref,
+                                      const char        *name,
+                                      const FusionWorld *world);
+
+DirectResult fusion_ref_set_name     (FusionRef         *ref,
+                                      const char        *name);
+
+/*
+ * Lock, increase, unlock.
+ */
+DirectResult fusion_ref_up           (FusionRef *ref, bool global);
+
+/*
+ * Lock, decrease, unlock.
+ */
+DirectResult fusion_ref_down         (FusionRef *ref, bool global);
+
+/*
+ * Get the current reference count. Meant for debugging only.
+ * This value is not reliable, because no locking will be performed
+ * and the value may change after or even while returning it.
+ */
+DirectResult fusion_ref_stat         (FusionRef *ref, int *refs);
+
+/*
+ * Wait for zero and lock.
+ */
+DirectResult fusion_ref_zero_lock    (FusionRef *ref);
+
+/*
+ * Check for zero and lock if true.
+ */
+DirectResult fusion_ref_zero_trylock (FusionRef *ref);
+
+/*
+ * Unlock the counter.
+ * Only to be called after successful zero_lock or zero_trylock.
+ */
+DirectResult fusion_ref_unlock       (FusionRef *ref);
+
+/*
+ * Have the call executed when reference counter reaches zero.
+ */
+DirectResult fusion_ref_watch        (FusionRef  *ref,
+                                      FusionCall *call,
+                                      int         call_arg);
+
+/*
+ * Inherit local reference count from another reference.
+ *
+ * The local count of the other reference (and its inherited references) is added to this reference.
+ */
+DirectResult fusion_ref_inherit      (FusionRef *ref,
+                                      FusionRef *from);
+
+/*
+ * Deinitialize.
+ * Can be called after successful zero_lock or zero_trylock
+ * so that waiting fusion_ref_up calls return with DR_DESTROYED.
+ */
+DirectResult fusion_ref_destroy      (FusionRef *ref);
+
+#endif
+