FILEDESC_LOCK() implementation

[Poul-Henning Kamp]

In message <20060612075515.C26634 at fledge.watson.org>, Robert Watson writes:

>What we probably want is an sx_init_interlock() that allows us to provide the 
>interlock for an sx lock, wich some variations on sx_*lock() to say we already 
>hold the interlock. 

Sounds overly complicated to use.

Why not just a sx_xlockfast() sx_xunlockfast() ? for some value of "fast" ?

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