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| author | David Feuer <david.feuer@gmail.com> | 2017-02-03 17:24:17 -0500 |
|---|---|---|
| committer | David Feuer <David.Feuer@gmail.com> | 2017-02-03 17:25:28 -0500 |
| commit | 2f5cb3d44d05e581b75a47fec222577dfa7a533e (patch) | |
| tree | 21704273ae11242c67ead8929bf71713618a1db1 /includes | |
| parent | afa409faffba6c340db9ee20f7fa2634ac4f8cd0 (diff) | |
| download | haskell-2f5cb3d44d05e581b75a47fec222577dfa7a533e.tar.gz | |
Attempt to make lazy ST thread safe
Use `noDuplicate#` to prevent lazy `ST` thunks from
being evaluated in multiple GHC threads.
Some lazy `ST` functions added laziness that did not seem to be useful
(e.g.,
creating lazy pairs that will never be matched unless one of their
components
is demanded). Stripped that out.
Reviewers: ekmett, simonpj, bgamari, simonmar, austin, hvr
Subscribers: rwbarton, thomie
Differential Revision: https://phabricator.haskell.org/D3038
GHC Trac Issues: #11760
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