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Simon Marlow authored
- BLACKHOLE_BQ is a mutable object, because new threads get added to its blocking_queue field. Hence add a mut_link field and treat it as mutable in the garbage collector. - Change StgBlackHole to StgBlockingQueue while I'm at it. - Optimise evacuation of black holes: don't copy the padding words, just skip over them. - Several garbage collection fixes. - Improve sanity checking: now the older generations are fully checked at each GC.
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