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View Code? Open in Web Editor NEWImplementation of skip variables (a special case of skip channels)
License: MIT License
Implementation of skip variables (a special case of skip channels)
License: MIT License
First thread (readSVar) | Second thread (putSVar) |
---|---|
takeMVar lock | _ |
_ | _ <- takeMVar var |
_ | hasToNotify <- isEmptyMVar lock -- True |
_ | putMVar var value -- var has new value |
value <- takeMVar var -- new value read | _ |
putMVar var value | _ |
_ | when hasToNotify $ putMVar lock () |
In the end lock (notification flag) is set, although the new value is already read once, so it's going to be read again.
In the following scenario:
s <- newSVar value
consume =<< readSVar s
value is not garbage collected after being consumed, although it's not needed anymore.
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