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+With Tornado’s gen module, you can turn Python generators into full-featured
+coroutines, but coordination among these coroutines is difficult without
+mutexes, semaphores, and queues.
+
+Toro provides to Tornado coroutines a set of locking primitives and queues
+analogous to those that Gevent provides to Greenlets, or that the standard
+library provides to threads.
+
+(Note that these primitives and queues are not actually thread-safe and
+cannot be used in place of those from the standard library–they are meant to
+coordinate Tornado coroutines in single-threaded apps, not to protect shared
+objects in multithreaded apps.)