Quoth Andrew Coppin
On 29/12/2011 04:29 AM, Antoine Latter wrote: ...
This bug and its discussion is similar, but not identical: http://hackage.haskell.org/trac/ghc/ticket/4363
This one has been rumbling on for ages. As others have said, the Report demands that locking occur, which is probably a mistake.
The rationale that followed may have been a little sketchy, but apparently everyone agrees with with the point. I see the ticket led to a discussion on the libraries list - http://www.haskell.org/pipermail/libraries/2011-October/016978.html ... wherein Ian Lynagh proposed to remove this feature and let the programmer enforce locking or not, as in other programming languages' base I/O libraries. This met with enthusiastic universal support, so whatever the Report may say, it looks to me like the GHC libraries will eventually not do this. Donn