[Haskell-cafe] How to ensure code executes in the context of a specific OS thread?

[Jason Dagit]

On Sun, Jul 3, 2011 at 10:31 PM, David Barbour <dmbarbour at gmail.com> wrote:
>
> On Jul 3, 2011, Jason Dagit <dagitj at gmail.com> wrote:
>>
>> to correctly handle GUI events you need to use the original thread
>> allocated to your process to check for events and to call the Cocoa
>> framework functionality.
>>
>> I looked at the threading documentation in Control.Concurrent for GHC and
>> it's not clear to me if this is even possible with GHC without restricting
>> to the non-threaded RTS.
>
> The 'main' thread in GHC is the bound thread initially allocated to the
> process.

That doesn't seem to be the case for GHCI.

> You can easily establish an event-loop in the main thread, and feed
> events from other threads. Consider using Control.Concurrent.Chan.
> If you need feedback, things get a bit trickier because you'll have special
> cases based on whether you're starting in the main thread.

Yes, that might work for compiled programs.  What about GHCI?

Jason