Removing the PyPy global lock

The PyPy Status Blog has an article describing a plan to remove the global interpreter lock and switch to an transactional memory scheme. "During a transaction, we don't actually change the global memory at all. Instead, we use the thread-local transaction object. We store in it which objects we read from, which objects we write to, and what values we write. It is only when the transaction reaches its end that we attempt to 'commit' it. Committing might fail if other commits have occurred in between, creating inconsistencies; in that case, the transaction aborts and must restart from the beginning."

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