All of this really feels like what STM is good at. It might help if you
explained why TChans are not well suited to your task.
On Nov 26, 2010 6:51 PM, "Mitar"
Hi!
Now that isEmptyChan is deprecated (#4154) it would be useful to add tryReadChan. It seems it is possible to define it so that it does not block like isEmptyChan. This is because semantics is a bit different: tryReadChan is allowed to return Nothing also when Chan is non-empty, but it would block. Contrary, isEmptyChan is expected that it would return False only if Chan is really empty.
I have defined also two new MVar functions which helped me implementing tryReadChan: tryReadMVar and tryModifyMVar. Probably it would be useful to make them public.
Please comment. I propose three weeks for discussion.
I have also opened a ticket:
http://hackage.haskell.org/trac/ghc/ticket/4535
and attached a ptach there with working implementation. It would be useful to run it against some tests.
(I am sorry that patch is not in darcs format.)
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