Comments (4)
kazu-yamamoto
commented on August 21, 2024
@barrucadu I hope you find this issue.
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barrucadu
commented on August 21, 2024
I'd be surprised if the race condition from 2014 is still happening, since that was due to readMVar being non-atomic in a sufficiently old version of GHC. I'll have a look.
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barrucadu
commented on August 21, 2024
Ok, well, I don't really remember exactly what I was showing in the paper there (and I seem to have left that part of the example out of my thesis - but kept the deadlock part), but returning either 0 or 1 here is expected because this code is inherently racy: if you read the value at the same time it's supposed to be updated, what happens? Well, if you're slightly earlier you'll get the old value, if you're slightly after you'll get the new value. Maybe I was just wrong back then and nobody spotted it? Who knows.
The deadlock doesn't happen, which is the important thing.
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kazu-yamamoto
commented on August 21, 2024
@barrucadu Thanks. I'm relieved to hear that. Let's close this issue.
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