Duncan Coutts ha scritto:
On Fri, 2008-09-19 at 18:46 +0200, Manlio Perillo wrote:
Don Stewart ha scritto:
manlio_perillo:
Hi.
After having read http://book.realworldhaskell.org/read/concurrent-and-multicore-programming.h...
I have a doubt about Data.ByteString.Lazy.
Why getContents function don't use pread (or an emulation, if not available)? Why would it?
So that you don't need to open the same file multiple time: http://book.realworldhaskell.org/read/concurrent-and-multicore-programming.h...
We are constrained here by the semantics of Handle which requires that getContents semi-close the Handle (which in turn is to make it harder to shoot yourself in the foot while doing lazy IO).
But if every function that reads the data uses pread, then this should no more be a problem. Or I'm missing some other thing?
Duncan
Manlio Perillo