diff --git a/synapse/util/lrucache.py b/synapse/util/lrucache.py
index 2f7b615f78..96163c90f1 100644
--- a/synapse/util/lrucache.py
+++ b/synapse/util/lrucache.py
@@ -14,6 +14,10 @@
# limitations under the License.
+from functools import wraps
+import threading
+
+
class LruCache(object):
"""Least-recently-used cache."""
# TODO(mjark) Add mutex for linked list for thread safety.
@@ -24,6 +28,16 @@ class LruCache(object):
PREV, NEXT, KEY, VALUE = 0, 1, 2, 3
+ lock = threading.Lock()
+
+ def synchronized(f):
+ @wraps(f)
+ def inner(*args, **kwargs):
+ with lock:
+ return f(*args, **kwargs)
+
+ return inner
+
def add_node(key, value):
prev_node = list_root
next_node = prev_node[NEXT]
@@ -51,6 +65,7 @@ class LruCache(object):
next_node[PREV] = prev_node
cache.pop(node[KEY], None)
+ @synchronized
def cache_get(key, default=None):
node = cache.get(key, None)
if node is not None:
@@ -59,6 +74,7 @@ class LruCache(object):
else:
return default
+ @synchronized
def cache_set(key, value):
node = cache.get(key, None)
if node is not None:
@@ -69,6 +85,7 @@ class LruCache(object):
if len(cache) > max_size:
delete_node(list_root[PREV])
+ @synchronized
def cache_set_default(key, value):
node = cache.get(key, None)
if node is not None:
@@ -79,6 +96,7 @@ class LruCache(object):
delete_node(list_root[PREV])
return value
+ @synchronized
def cache_pop(key, default=None):
node = cache.get(key, None)
if node:
@@ -87,9 +105,11 @@ class LruCache(object):
else:
return default
+ @synchronized
def cache_len():
return len(cache)
+ @synchronized
def cache_contains(key):
return key in cache
|
