#6130: Weak pointer to MVar is finalized, even though MVar is still accessible
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Reporter: jmillikin | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.4.1
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: Incorrect result at runtime
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Changes (by simonmar):
* difficulty: => Unknown
Comment:
I suspect this is just because the weak pointer is attached to the box,
and not the primitive `MVar#` object underneath, and when optimisation is
turned on GHC eliminates the box. We should really have a `mkWeakMVar`
operation, just like we have `mkWeakIORef` and `mkWeakThreadId`.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6130#comment:1>
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