Re: Change in functionality of futex() system call.

[Eric Dumazet]

Le lundi 06 juin 2011 Ã 19:05 +0200, Peter Zijlstra a Ãcrit :

> Dunno, using futexes on private file maps is stupid imo, its just asking
> for trouble, ro private file maps are even worse. Forcing the COW is the
> only sane answer in that it gives consistent results and 'breaks' silly
> expectations early instead of sometimes.
> 
> Anyway, that's not really the issue here, as David uses MAP_SHARED (as
> one should if one is interested in the shared value).

Sure, but maybe another guy is 'stupid' and uses MAP_PRIVATE on its
read-only mappings. With old kernels this was working, and we were not
doing the COW.

(Note : the other process writes to the file, using MAP_SHARED)



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