[earenndil]

There are the basic primitives found in c/any language, but there are also synchronized{} (or synchronized (my_mutex) {}) blocks that essentially automagically handle locking/unlocking and let you just mutate around willy-nilly across threads (in that block). There are also atomics, although the syntax for using them is a bit clumsy (foo.atomicOp!"+="(7), anyone?).