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/System/Library/Frameworks/JavaVM.framework/Frameworks/JavaNativeFoundation.framework/Headers/JNFRunLoop.h

Using pthread_lock() or NSLock will almost always get you in trouble
- These locks are not recursive like Java locks are
Using @synchronized in ObjC is slow
- Since the lock storage is not in the object header itself (like it is in Java) a side-table must be consulted
If you need to serialize execution of a task in native, use a serial GCD dispatch_queue
- They are quite cheap to use in the uncontended case
Avoid doing any work that will call back up into Java while holding a native lock or performing on a serial queue
- It is very easy to deadlock with a Java semaphore and not realize it
  - These deadlocks are almost impossible to debug

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