[GHC] #12059: Add primop to query for pinned-ness of a ByteArray

[GHC]

#12059: Add primop to query for pinned-ness of a ByteArray
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        Reporter:  bgamari           |                Owner:
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2217
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"310371ff2d5b73cdcb2439b67170ca5e613541c0/ghc" 310371f/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="310371ff2d5b73cdcb2439b67170ca5e613541c0"
 rts: Add isPinnedByteArray# primop

 Adds a primitive operation to determine whether a particular
 `MutableByteArray#` is backed by a pinned buffer.

 Test Plan: Validate with included testcase

 Reviewers: austin, simonmar

 Reviewed By: austin, simonmar

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2217

 GHC Trac Issues: #12059
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12059#comment:3>
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