doc: add thread-safety information about EFD library

[dpdk.git] / doc / guides / prog_guide / efd_lib.rst

diff --git a/doc/guides/prog_guide/efd_lib.rst b/doc/guides/prog_guide/efd_lib.rst
index 5b8e4e3..3f90fa9 100644 (file)
--- a/doc/guides/prog_guide/efd_lib.rst
+++ b/doc/guides/prog_guide/efd_lib.rst
@@ -270,6 +270,11 @@ failed to find a suitable perfect hash or the group was full). The function
 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
 ~~~~~~~~~~
 
@@ -285,6 +290,11 @@ lookup function. ``rte_efd_lookup_bulk()`` is the bulk lookup function,
 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
 ~~~~~~~~~~
 
@@ -295,6 +305,11 @@ use to lookup the existing value, which is ideally the caller's socket id.
 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