[dpdk-dev] [PATCH] doc: add thread-safety information about EFD library
Pablo de Lara
pablo.de.lara.guarch at intel.com
Tue Feb 14 16:02:53 CET 2017
Signed-off-by: Pablo de Lara <pablo.de.lara.guarch at intel.com>
---
doc/guides/prog_guide/efd_lib.rst | 15 +++++++++++++++
lib/librte_efd/rte_efd.h | 6 ++++++
2 files changed, 21 insertions(+)
diff --git a/doc/guides/prog_guide/efd_lib.rst b/doc/guides/prog_guide/efd_lib.rst
index 5b8e4e3..3f90fa9 100644
--- 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
diff --git a/lib/librte_efd/rte_efd.h b/lib/librte_efd/rte_efd.h
index 1a1cb5b..6d31e18 100644
--- a/lib/librte_efd/rte_efd.h
+++ b/lib/librte_efd/rte_efd.h
@@ -198,6 +198,8 @@ rte_efd_find_existing(const char *name);
* Computes an updated table entry for the supplied key/value pair.
* The update is then immediately applied to the provided table and
* all socket-local copies of the chunks are updated.
+ * This operation is not multi-thread safe
+ * and should only be called one from thread.
*
* @param table
* EFD table to reference
@@ -227,6 +229,8 @@ rte_efd_update(struct rte_efd_table *table, unsigned int socket_id,
/**
* Removes any value currently associated with the specified key from the table
+ * This operation is not multi-thread safe
+ * and should only be called from one thread.
*
* @param table
* EFD table to reference
@@ -247,6 +251,7 @@ rte_efd_delete(struct rte_efd_table *table, unsigned int socket_id,
/**
* Looks up the value associated with a key
+ * This operation is multi-thread safe.
*
* NOTE: Lookups will *always* succeed - this is a property of
* using a perfect hash table.
@@ -270,6 +275,7 @@ rte_efd_lookup(const struct rte_efd_table *table, unsigned int socket_id,
/**
* Looks up the value associated with several keys.
+ * This operation is multi-thread safe.
*
* NOTE: Lookups will *always* succeed - this is a property of
* using a perfect hash table.
--
2.7.4
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