Bulat Ziganshin wrote:
Hello Scott,
Sunday, December 16, 2007, 11:57:33 PM, you wrote:
My question is: what exactly does GHC.Prim.touch# do? This appears to
it's a no-op (for ghc 6.6+ at least). its only task is to notify ghc
optimizer that data were accessed so it doesn't free the memory
Yes, exactly. touch# generates no code, but it is vitally important
because if the ForeignPtr is referencing data in the heap (like
mallocForeignPtrBytes does), it prevents the data from being GC'd before
the operation completes.
Cheers,
Simon
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