f_offset

[Poul-Henning Kamp]

In message <20080412221654.S959 at desktop>, Jeff Roberson writes:

>> The non p-prefix versions should always be serialized, because there
>> is know way of knowing where they read/write if you don't.
>
>Well that's at odds with what the standard says and what others implement. 
>I think there is a clear case for serializing writes.  I don't see what 
>advantage we get from serializing reads.  The heavy cost of 
>synchronization should be justified by actual need.

If you don't serialize read(2) and readv(2), how do you know where
they read from ?

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