On Tue, 3 Jul 2012, James Litchfield wrote:

Agreed - msync/munmap is the only guarantee.

I don't see that the munmap definition assures that anything is written to "disk". The system is free to buffer the data in RAM as long as it likes without writing anything at all.

Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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