A fast concurrent unique identifier supply with a pure API

Version on this page:0.1.8@rev:1
LTS Haskell 19.33:0.1.8@rev:1
Stackage Nightly 2023-09-24:0.1.8@rev:2
Latest on Hackage:0.1.8@rev:2

See all snapshots concurrent-supply appears in

BSD-3-Clause licensed by Edward A. Kmett
Maintained by Edward A. Kmett
This version can be pinned in stack with:concurrent-supply-0.1.8@sha256:9373f4868ad28936a7b93781b214ef4afdeacf377ef4ac729583073491c9f9fb,1627

Module documentation for 0.1.8

Used by 3 packages in nightly-2022-03-17(full list with versions):

A fast supply of concurrent unique identifiers suitable for use within a single process. Once the initial Supply has been initialized, the remainder of the API is pure. See Control.Concurrent.Supply for details.



  • Support GHC 8


  • -fno-full-laziness was added to work around changes in the GHC inliner.


  • Claim to be Trustworthy
  • Added a simple example