Message9844

So I looked into this, and got pretty far, with all lock tests passing, including ones previously skipped. Patch attached (use-semaphore-for-lock.patch).

However the problem is that threading.Condition is built so that it can take Lock.newCondition, which means it needs a class that implements the Lock interface.

We can readily implement this with lower-level synchronization primitives provided by java.util.concurrent, most likely LockSupport, but it's unfortunately too late for RC3.

Target 2.7.1