Re: [Haskell-cafe] STM and `orElse` on a few thousand TMVars

On 12/6/05, Joel Reymont wrote:

I'm trying to implement a better waitForChildren from the docs for Control.Concurrent.

I would like to know when all the children exit, basically, and I thought it would be neat to try to do that with STM.

I apologise if this doesn't make sense (I'm fairly new to Haskell), but wouldn't a single shared counter be sufficient for this? Increment for each child launched. Decrement by each finished child. When it's back down to zero, you're done. Regards, Maarten