#10731: System.IO.openTempFile is not thread safe on Windows -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: libraries/base | Version: 7.10.1 Resolution: | Keywords: Operating System: Windows | Architecture: | Unknown/Multiple Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by NeilMitchell): I've avoided this issue in the extra package (https://github.com/ndmitchell/extra/blob/master/src/System/IO/Extra.hs) with three techniques: * To avoid races within a process, I have a single IORef which I increment to find unique names. That guarantees that a process will never clash with itself. * To help avoid cross-process races I start that IORef at a random starting point (using the start time plus Process Id would be ideal, but I couldn't get that easily, so I use the time). * If all else fails, I retry up to 5 times on IO errors. With those features, I've yet to get a failure. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10731#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler