Haskell doesn't, but the compilers all support a kind of global mutable variable. See various lengthy discussions on the topic on this list and the Haskell list in the past. Briefly, you do it like this: {-# NOILINE var #-} var :: IORef [ThreadId] var = unsafePerformIO (newIORef []) and if you're using GHC, compile the module with -fno-cse. Cheers, Simon On 22 September 2005 17:58, S. Alexander Jacobson wrote:

Ok, I didn't think Haskell had mutable global variables. How would this work?

-ALex-

On Thu, 22 Sep 2005, Simon Marlow wrote:

...

There's no getAllThreadIds or similar right now. You have to save the ThreadIds yourself, perhaps in a global variable. Writing to a file doesn't work because there's no instance Read ThreadId.

Cheers, Simon

On 21 September 2005 21:14, S. Alexander Jacobson wrote:

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More particularly, is there a getAllThreadIds function somewhere?

-Ale-

On Wed, 21 Sep 2005, S. Alexander Jacobson wrote:

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Is the general pattern to write all threadIds to a file, and then have a separate function that takes the file and kills them?

Or is there something more clever?

-Alex-

On Wed, 21 Sep 2005, Simon Marlow wrote:

...

On 16 September 2005 20:42, S. Alexander Jacobson wrote:

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If I am running a server interactively. (using ghci). Is there any way to kill its running threads without terminating the interpreter?

If you can get ThreadIds for the threads, yes. GHCi doesn't (currently) create a new thread for each expression evaluation, so attempting to kill that thread might kill your GHCi session (it shouldn't but that's another story).

Cheers, Simon

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