On Sat, Feb 8, 2014 at 7:26 AM, Richard Hipp <d...@sqlite.org> wrote: > OpenBSD lacks a coherent filesystem cache. That is to say, changes to a > file made using write() are not necessarily reflected in mmap-ed memory > right away. And change to a mmap-ed segment are not necessarily reflected > in subsequent read() operations.
Availability of unified caches are not entirely a function of the OS; the OS may support it but the filesystem might not. The right thing to do is to msync() with MS_INVALIDATE in this case. It should be a no-op when the OS+filesystem implement a unified cache. It will be expensive when they don't. I don't recall if there's a portable way to find out if the OS+filesystem provide a unified cache. Nico -- _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
