will return ``EFD_UPDATE_NO_CHANGE (3)`` if there is no change to the EFD
table (i.e, same value already exists).
+.. Note::
+
+ This function is not multi-thread safe and should only be called
+ from one thread.
+
EFD Lookup
~~~~~~~~~~
that looks up num_keys simultaneously stored in the key_list and the
corresponding return values will be returned in the value_list.
+.. Note::
+
+ This function is multi-thread safe, but there should not be other threads
+ writing in the EFD table, unless locks are used.
+
EFD Delete
~~~~~~~~~~
The previous value associated with this key will be returned
in the prev_value argument.
+.. Note::
+
+ This function is not multi-thread safe and should only be called
+ from one thread.
+
.. _Efd_internals:
Library Internals