I logged an issue on Codeplex (#6449) about the previous deadlock bug I
encountered, and I have come up with a patch which should fix the issue,
which I've submitted as a pull request:
https://github.com/gglresearchanddevelopment/ironlanguages-main/commit/e8be67232d71eb879a1b9487e6fc5e8a93f99266
To explain the patch:
I did some more research, and it appears as though there was already a
lock order implicitly specified when locking both ClassHierarchyLock and
ModuleCacheLock - the hierarchy lock must come first: (refer
RubyContext.cs line 1051)
I then traced through all the Locks in RubyContext - The majority are
simple operations and don't require any modification, so I added comments
accordingly
I followed the usage of ModuleCacheLock, and made sure the hierarchy lock
was acquired first if it might need to be acquired in a nested call.
- This amounts to a couple of calls to GetOrCreateClassNoLock, which
requires both the module cache lock and the hierarchy lock
Also added a comment above ModuleCacheLock explaining the lock order, and
a RequiresClassHierarchyLock to GetOrCreateClassNoLock to clarify these
things.
I've run some heavily multithreaded test code I have and the changes seem
to make no appreciable difference to the performance or multi threading
capability of IronRuby
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