JEP 193: Enhanced Volatiles (original) (raw)

Christoph Engelbert me at noctarius.com
Wed Mar 5 07:51:08 UTC 2014

Am 05.03.2014 um 08:40 schrieb Jeroen Frijters <jeroen at sumatra.nl>:

My goal here is to make sure that expert users can get their job done somehow, without making the job of mainstream developers harder. The "add lvalues to Java so experts can write CAS-libraries" fails that test miserably. Why not go for something far less intrusive then? Here's my straw man proposal: Add an annotation that can be placed on native methods to synthesize atomic accessor methods. Example usage: @AtomicField("next") private native boolean compareAndSet(Node expected, Node newValue); @AtomicArray private static native boolean compareAndSet(Node[] array, Node expected, Node newValue); (Note that the method name is not significant, the operation can be derived from the signature, or explicit in the annotation, if necessary.) This requires no changes to the language and adds only a slight burden on the developer (but it's very easy to add tooling support). Regards, Jeroen

That looks like a good fit towards what was mentioned earlier using method handles. The JVM or compiler could just look out for those annotations and generate corresponding method / field handles to execute it.

Thanks, Chris

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