add threading comment

sinatra · Jun 1, 2013 · 993387d · 993387d
1 parent 486b5fa
commit 993387d
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/lib/mustermann/equality_map.rb b/lib/mustermann/equality_map.rb
@@ -18,6 +18,9 @@ def initialize
     def fetch(*key)
       identity = @keys[key.hash]
       key      = identity == key ? identity : key
+
+      # it is ok that this is not thread-safe, worst case it has double cost in
+      # generating, object equality is not guaranteed anyways
       @map[key] ||= track(key, yield)
     end