Index: uspace/lib/c/generic/async.c
===================================================================
--- uspace/lib/c/generic/async.c	(revision 007e6efa14f9116036c5ff0b040b3fbedee25b6f)
+++ uspace/lib/c/generic/async.c	(revision 4db1fbf7ba8464cc0ba04d663a9a284673fdd25b)
@@ -94,5 +94,4 @@
 #include <futex.h>
 #include <async.h>
-#include <async_priv.h>
 #include <fibril.h>
 #include <stdio.h>
@@ -105,4 +104,5 @@
 #include <arch/barrier.h>
 #include <bool.h>
+#include "priv/async.h"
 
 atomic_t async_futex = FUTEX_INITIALIZER;
Index: uspace/lib/c/generic/fibril_synch.c
===================================================================
--- uspace/lib/c/generic/fibril_synch.c	(revision 007e6efa14f9116036c5ff0b040b3fbedee25b6f)
+++ uspace/lib/c/generic/fibril_synch.c	(revision 4db1fbf7ba8464cc0ba04d663a9a284673fdd25b)
@@ -36,5 +36,4 @@
 #include <fibril.h>
 #include <async.h>
-#include <async_priv.h>
 #include <adt/list.h>
 #include <futex.h>
@@ -44,4 +43,5 @@
 #include <stacktrace.h>
 #include <stdlib.h>
+#include "priv/async.h"
 
 static void optimize_execution_power(void)
Index: uspace/lib/c/generic/priv/async.h
===================================================================
--- uspace/lib/c/generic/priv/async.h	(revision 4db1fbf7ba8464cc0ba04d663a9a284673fdd25b)
+++ uspace/lib/c/generic/priv/async.h	(revision 4db1fbf7ba8464cc0ba04d663a9a284673fdd25b)
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2006 Ondrej Palkovsky
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libc
+ * @{
+ */
+/** @file
+ */
+
+#ifndef LIBC_PRIV_ASYNC_H_
+#define LIBC_PRIV_ASYNC_H_
+
+#include <adt/list.h>
+#include <fibril.h>
+#include <sys/time.h>
+#include <bool.h>
+
+/** Structures of this type are used to track the timeout events. */
+typedef struct {
+	/** If true, this struct is in the timeout list. */
+	bool inlist;
+	
+	/** Timeout list link. */
+	link_t link;
+	
+	/** If true, we have timed out. */
+	bool occurred;
+	
+	/** Expiration time. */
+	struct timeval expires;
+} to_event_t;
+
+/** Structures of this type are used to track the wakeup events. */
+typedef struct {
+	/** If true, this struct is in a synchronization object wait queue. */
+	bool inlist;
+	
+	/** Wait queue linkage. */
+	link_t link;
+} wu_event_t;
+
+/** Structures of this type represent a waiting fibril. */
+typedef struct {
+	/** Identification of and link to the waiting fibril. */
+	fid_t fid;
+	
+	/** If true, this fibril is currently active. */
+	bool active;
+	
+	/** Timeout wait data. */
+	to_event_t to_event;
+	/** Wakeup wait data. */
+	wu_event_t wu_event;
+} awaiter_t;
+
+extern void async_insert_timeout(awaiter_t *);
+
+#endif
+
+/** @}
+ */