+The shared\_dict.SharedDict class is a normal python dictionary that
+can be accessed safely in parallel from multiple threads or processes
+without (external) locking by using Multiprocessing.SharedMemory. It
+uses internal locking and rewrites the shared memory region as it is
+changed so it is slower than a normal dict. It also does not grow
+dynamically; the creator of the shared\_dict must declare a maximum
+size.
+