#4533: IO manager can leak MVars if threads are killed
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Reporter: bos | Owner:
Type: bug | Status: new
Priority: normal | Component: Runtime System
Version: 7.0.1 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Incorrect result at runtime
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Comment(by bos):
This isn't going to be entirely trivial to fix.
I think what we need to do is use
[http://haskell.org/ghc/docs/6.12.2/html/libraries/base-4.2.0.1/System-
Mem-Weak.html System.Mem.Weak] to store the callback in an {{{FdData}}} as
a weak reference.
We'd also add a finalizer such that, if the callback gets GCed because its
thread has died, we'd use {{{unregisterFd}}} to drop the registration.
This should happen within {{{System.Event.Manager}}} rather than
{{{System.Event.Thread}}}.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4533#comment:2>
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