[GHC] #10613: Mechanism for checking that we only enter single-entry thunks once
GHC
ghc-devs at haskell.org
Tue Jul 21 03:35:48 UTC 2015
#10613: Mechanism for checking that we only enter single-entry thunks once
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Reporter: bgamari | Owner:
Type: feature request | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.10.1
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: Other | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Revisions:
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Comment (by rwbarton):
For what it's worth, while investigating #10414, I ran the whole test
suite with `-feager-blackholing`, which (at the time) caused all single-
entry thunks to be overwritten with a black hole on entry. There were no
test failures, which gives me a reasonably high degree of confidence that
the "single-entry thunks are entered only once" invariant is maintained,
outside of the situations involving multiple threads entering a closure
simultaneously discussed in #10414.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10613#comment:2>
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