[Haskell-cafe] turn off "thread blocked indefinitely in an STM transaction"?

Roman Cheplyaka roma at ro-che.info
Tue Nov 17 12:15:41 UTC 2015

On 11/17/2015 02:06 PM, Johannes Waldmann wrote:
> Ah, neat. I get the idea. But does it work here?
> import Control.Concurrent.STM
> import Foreign.StablePtr
> main =  atomically retry >>= newStablePtr
> ghc -threaded -rtsopts -O2 sp.hs
> ./sp +RTS -N
> sp: thread blocked indefinitely in an STM transaction

StablePtr needs to contain the ThreadId of the current thread.

  myThreadId >>= newStablePtr
  atomically retry

In your example, newStablePtr won't even be called until retry has been


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