Small refactoring, and add comments
authorSimon Marlow <marlowsd@gmail.com>
Wed, 19 Nov 2008 14:37:02 +0000 (14:37 +0000)
committerSimon Marlow <marlowsd@gmail.com>
Wed, 19 Nov 2008 14:37:02 +0000 (14:37 +0000)
I discovered a new invariant while experimenting (blackholing is not
optional when using parallel GC), so documented it.


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