[GHC] #5364: Access RTS flag values from inside Haskell programs

[GHC]

#5364: Access RTS flag values from inside Haskell programs
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        Reporter:  ezyang            |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:  7.6.2
       Component:  libraries/base    |          Version:  7.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Changes (by ezyang):

 * cc: hvr (added)
 * difficulty:   => Unknown


Old description:

> Strictly speaking, it is already possible to do this since
> includes/rts/Flags.h exports RtsFlags, which can be accessed with a mini
> wrapper function. We should add this wrapper function so we can import
> it, and then write code which reads out the contents of all the various
> parameters so that users can introspect this at runtime. Maybe put them
> in the GHC.RTS module.

New description:

 Strictly speaking, it is already possible to do this since
 `includes/rts/Flags.h` exports `RtsFlags`, which can be accessed with a
 mini wrapper function. We should add this wrapper function so we can
 import it, and then write code which reads out the contents of all the
 various parameters so that users can introspect this at runtime. Maybe put
 them in the `GHC.RTS` module.

--

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5364#comment:4>
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