ThreadId to Int

[Andrew Martin]

I don't know. Since CInt is just a newtype wrapper around Int32, at the
moment it seems limited to that. I'm not sure about the actual data
structure that's being read from though. Int64 (or Word64) seems more
appropriate since it's certainly possible to fork more than 4 billion
threads in the lifetime of one haskell application. But my guess is that
it's currently just backed by Int32.

On Wed, Nov 1, 2017 at 1:04 PM, David Feuer <david.feuer at gmail.com> wrote:

> If there some concern a ThreadId could be bigger than an Int
> somewhere/somewhen? Should it be Int64? Or could it be variable size,
> suggesting whatever it is that backs SmallByteString?
>
> On Nov 1, 2017 10:54 AM, "Andrew Martin" <andrew.thaddeus at gmail.com>
> wrote:
>
>> ThreadId has a Show instance that makes uses the FFI to turn a ThreadId
>> to a CInt:
>>
>>     instance Show ThreadId where
>>        showsPrec d t =
>>             showString "ThreadId " .
>>             showsPrec d (getThreadId (id2TSO t))
>>
>>     foreign import ccall unsafe "rts_getThreadId" getThreadId ::
>> ThreadId# -> CInt
>>
>> Can getThreadId be exported? This would make it possible to write a
>> Hashable instance for ThreadId, and it would make it possible to use a
>> ThreadId to index into an array (with modulus of course).
>>
>> -Andrew Thaddeus Martin
>>
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>>


-- 
-Andrew Thaddeus Martin
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