diff --git a/src/mi/dyn-cancel.c b/src/mi/dyn-cancel.c
index e69de29b..85a36458 100644
--- a/src/mi/dyn-cancel.c
+++ b/src/mi/dyn-cancel.c
@@ -0,0 +1,46 @@
+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2001-2002 Hewlett-Packard Co
+	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+
+#include "internal.h"
+
+void
+_U_dyn_cancel (unw_dyn_info_t *di)
+{
+  mutex_lock (&_U_dyn_info_list_lock);
+  {
+    ++_U_dyn_info_list.generation;
+
+    if (di->prev)
+      di->prev->next = di->next;
+    else
+      _U_dyn_info_list.first = di->next;
+
+    if (di->next)
+      di->next->prev = di->prev;
+  }
+  mutex_unlock (&_U_dyn_info_list_lock);
+
+  di->next = di->prev = NULL;
+}