Index: uspace/lib/c/generic/async.c
===================================================================
--- uspace/lib/c/generic/async.c	(revision 7b2a7ad2d18b562e1cc4e78a77043cc16945474a)
+++ uspace/lib/c/generic/async.c	(revision a0fc4be7fc5728e6a3ffacc1dc4b68ada5a428ae)
@@ -996,4 +996,7 @@
 	session_ns->arg3 = 0;
 	
+	fibril_mutex_initialize(&session_ns->remote_state_mtx);
+	session_ns->remote_state_data = NULL;
+	
 	list_initialize(&session_ns->exch_list);
 	fibril_mutex_initialize(&session_ns->mutex);
@@ -1561,4 +1564,7 @@
 	sess->arg3 = 0;
 	
+	fibril_mutex_initialize(&sess->remote_state_mtx);
+	sess->remote_state_data = NULL;
+	
 	list_initialize(&sess->exch_list);
 	fibril_mutex_initialize(&sess->mutex);
@@ -1642,4 +1648,7 @@
 	sess->arg3 = arg3;
 	
+	fibril_mutex_initialize(&sess->remote_state_mtx);
+	sess->remote_state_data = NULL;
+	
 	list_initialize(&sess->exch_list);
 	fibril_mutex_initialize(&sess->mutex);
@@ -1692,4 +1701,7 @@
 	sess->arg3 = arg3;
 	
+	fibril_mutex_initialize(&sess->remote_state_mtx);
+	sess->remote_state_data = NULL;
+	
 	list_initialize(&sess->exch_list);
 	fibril_mutex_initialize(&sess->mutex);
@@ -1722,4 +1734,7 @@
 	sess->arg2 = 0;
 	sess->arg3 = 0;
+	
+	fibril_mutex_initialize(&sess->remote_state_mtx);
+	sess->remote_state_data = NULL;
 	
 	list_initialize(&sess->exch_list);
@@ -2386,4 +2401,7 @@
 	sess->arg3 = 0;
 	
+	fibril_mutex_initialize(&sess->remote_state_mtx);
+	sess->remote_state_data = NULL;
+	
 	list_initialize(&sess->exch_list);
 	fibril_mutex_initialize(&sess->mutex);
@@ -2432,4 +2450,7 @@
 	sess->arg3 = 0;
 	
+	fibril_mutex_initialize(&sess->remote_state_mtx);
+	sess->remote_state_data = NULL;
+	
 	list_initialize(&sess->exch_list);
 	fibril_mutex_initialize(&sess->mutex);
@@ -2473,4 +2494,7 @@
 	sess->arg2 = 0;
 	sess->arg3 = 0;
+	
+	fibril_mutex_initialize(&sess->remote_state_mtx);
+	sess->remote_state_data = NULL;
 	
 	list_initialize(&sess->exch_list);
@@ -2514,4 +2538,74 @@
 }
 
+/** Lock and get session remote state
+ *
+ * Lock and get the local replica of the remote state
+ * in stateful sessions. The call should be paired
+ * with async_remote_state_release*().
+ *
+ * @param[in] sess Stateful session.
+ *
+ * @return Local replica of the remote state.
+ *
+ */
+void *async_remote_state_acquire(async_sess_t *sess)
+{
+	fibril_mutex_lock(&sess->remote_state_mtx);
+	return sess->remote_state_data;
+}
+
+/** Update the session remote state
+ *
+ * Update the local replica of the remote state
+ * in stateful sessions. The remote state must
+ * be already locked.
+ *
+ * @param[in] sess  Stateful session.
+ * @param[in] state New local replica of the remote state.
+ *
+ */
+void async_remote_state_update(async_sess_t *sess, void *state)
+{
+	assert(fibril_mutex_is_locked(&sess->remote_state_mtx));
+	sess->remote_state_data = state;
+}
+
+/** Release the session remote state
+ *
+ * Unlock the local replica of the remote state
+ * in stateful sessions.
+ *
+ * @param[in] sess Stateful session.
+ *
+ */
+void async_remote_state_release(async_sess_t *sess)
+{
+	assert(fibril_mutex_is_locked(&sess->remote_state_mtx));
+	
+	fibril_mutex_unlock(&sess->remote_state_mtx);
+}
+
+/** Release the session remote state and end an exchange
+ *
+ * Unlock the local replica of the remote state
+ * in stateful sessions. This is convenience function
+ * which gets the session pointer from the exchange
+ * and also ends the exchange.
+ *
+ * @param[in] exch Stateful session's exchange.
+ *
+ */
+void async_remote_state_release_exchange(async_exch_t *exch)
+{
+	if (exch == NULL)
+		return;
+	
+	async_sess_t *sess = exch->sess;
+	assert(fibril_mutex_is_locked(&sess->remote_state_mtx));
+	
+	async_exchange_end(exch);
+	fibril_mutex_unlock(&sess->remote_state_mtx);
+}
+
 /** @}
  */
Index: uspace/lib/c/generic/private/async.h
===================================================================
--- uspace/lib/c/generic/private/async.h	(revision 7b2a7ad2d18b562e1cc4e78a77043cc16945474a)
+++ uspace/lib/c/generic/private/async.h	(revision a0fc4be7fc5728e6a3ffacc1dc4b68ada5a428ae)
@@ -68,4 +68,10 @@
 	/** Number of opened exchanges */
 	atomic_t refcnt;
+	
+	/** Mutex for stateful connections */
+	fibril_mutex_t remote_state_mtx;
+	
+	/** Data for stateful connections */
+	void *remote_state_data;
 };
 
Index: uspace/lib/c/include/async.h
===================================================================
--- uspace/lib/c/include/async.h	(revision 7b2a7ad2d18b562e1cc4e78a77043cc16945474a)
+++ uspace/lib/c/include/async.h	(revision a0fc4be7fc5728e6a3ffacc1dc4b68ada5a428ae)
@@ -449,4 +449,9 @@
 extern int async_state_change_finalize(ipc_callid_t, async_exch_t *);
 
+extern void *async_remote_state_acquire(async_sess_t *);
+extern void async_remote_state_update(async_sess_t *, void *);
+extern void async_remote_state_release(async_sess_t *);
+extern void async_remote_state_release_exchange(async_exch_t *);
+
 #endif