Bryan O'Sullivan wrote:
But wait, there's more! If you're using the threaded RTS, you often
need to know how many threads you can run concurrently, for example to
explicitly split up a compute-bound task. This value is exposed at
runtime by the numCapabilities variable in the GHC.Conc module.
http://www.haskell.org/ghc/docs/latest/html/libraries/base-3.0.0.0/GHC-Conc.html#v%3AnumCapabilities
This variable is new in GHC 6.8.1 (thanks, Simon!), so don't try to
use it with an older release.
Hmm... I was *sure* this was exposed in Control.Concurrent already...
but, apparently, no. It seems you can only get at it from GHC.Conc.
That's kind of a pitty... oh well! ;-)
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