Re: [Haskell-cafe] Windows: openFile gives permission denied when file in use

On Thu, Dec 29, 2011 at 11:49:11AM +0000, Andrew Coppin wrote:

On 29/12/2011 04:29 AM, Antoine Latter wrote:

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On Wed, Dec 28, 2011 at 3:52 PM, Michael Snoyman wrote:

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Hi all,

I just received a bug report from a client that, when an input file is open in FrameMaker, my program gives a "permission denied error". This bug is reproducible with a simple Haskell program:

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 daft thing is, apparently Linux doesn't really support locking, so on that platform these types of thing all work fine, and only on Windows, which does and always has supported propper locking, people get these errors. And yet, many people seem surprised to hear that Windows can actually turn off the locking; they seem completely unaware of the extensive and highly flexible locking facilities that Windows provides. Every time I hear "oh, I don't think Windows can handle that", I sigh with resignation.

Sorry to say, but it seems you yourself are unaware of the "extensive and highly flexible" locking facilities on Linux :) The defaults on Linux are advisory locking, not mandatory, but claiming Linux doesn't support locking is plain wrong. regards, iustin