#367: Infinite loops can hang Concurrent Haskell
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Reporter: simonpj | Owner: ezyang
Type: bug | Status: new
Priority: lowest | Milestone: _|_
Component: Compiler | Version: 6.4.1
Resolution: None | Keywords: scheduler
allocation
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: Incorrect result at runtime | Difficulty: Unknown
Testcase: | Blockedby:
Blocking: | Related:
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Comment(by simonmar):
You could improve code size by omitting the `HpAlloc = 0` assignment
(perhaps making sure that it is initialized to zero in `LOAD_THREAD_STATE`
or something).
Another alternative is to use `SpLim` instead of `HpLim` to trigger the
interrupt, on the grounds that there are more stack checks than heap
checks. We would have to put `SpLim` in a memory location instead of a
register, but we could move `HpLim` into a register.
Something else we could do is add a flag on every top-level function to
say whether it is non-allocating (rather like the `NoCafRefs` flag), and
we could use that to optimise away many of the extra checks.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/367#comment:19>
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