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is used outside of the rts so we do this rather than just fish it out of
the repo in ad-hoc way, in order to make packages in this repo more
self-contained.
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This fixes two potentially problematic data races in the StablePtr
implementation:
* We would fail to RELEASE the stable pointer table when enlarging it,
causing other cores to potentially see uninitialized memory.
* We would fail to ACQUIRE when dereferencing a stable pointer.
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This moves all URL references to Trac tickets to their corresponding
GitLab counterparts.
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Long ago, the stable name table and stable pointer tables were one.
Now, they are separate, and have significantly different
implementations. I believe the time has come to finish the split
that began in #7674.
* Divide `rts/Stable` into `rts/StableName` and `rts/StablePtr`.
* Give each table its own mutex.
* Add FFI functions `hs_lock_stable_ptr_table` and
`hs_unlock_stable_ptr_table` and document them.
These are intended to replace the previously undocumented
`hs_lock_stable_tables` and `hs_lock_stable_tables`,
which are now documented as deprecated synonyms.
* Make `eqStableName#` use pointer equality instead of unnecessarily
comparing stable name table indices.
Reviewers: simonmar, bgamari, erikd
Reviewed By: bgamari
Subscribers: rwbarton, carter
GHC Trac Issues: #15555
Differential Revision: https://phabricator.haskell.org/D5084
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