Question about indirectees of BLACKHOLE closures

Ömer Sinan Ağacan omeragacan at
Thu Mar 29 06:28:19 UTC 2018

I still don't understand the whole story with blackholes but I'll
update the comments around the BLACKHOLE stack frame and/or wiki pages
once I get a better understanding.


2018-03-26 21:47 GMT+03:00 Ben Gamari <ben at>:
> Simon Marlow <marlowsd at> writes:
>> The raise closure is declared to be a THUNK:
>> Another example of this is when an asynchronous exception is thrown, and we
>> update all the thunks/BLACKHOLEs pointed to by the update frames to point
>> to new thunks (actually AP_STACK closures) representing the frozen state of
>> evaluation of those thunks.  For this, see rts/RaiseAsync.c.
> This thread has answered a number of interesting questions. It would be
> a shame if these answers vanished into the abyss of the ghc-devs
> archives.
> Omer, do you think you could make sure that the discussion here is
> summarized in a Note (or ensure that the relevant notes reference one
> another, if they already exist)?
> Cheers,
>  - Ben

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