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Re: rw_lock vs mutex
On Feb 2, 2012, at 5:38 PM, Paul Goyette wrote:
> While digging around looking into another problem, I noticed that the
> piixpm(4) driver uses an rw_lock for its ic_acquire_bus/ic_release_bus
> routines. ic_acquire_bus() uses rw_enter(..., RW_WRITER) and there doesn't
> appear to be any use anywhere of RW_READER for that lock.
> The man page for rw_lock implies that it is a superset of a mutex. So I'm
> wondering if it makes any sense to use the simpler mutex instead?
Switch to a mutex, it's much less overhead that a r/w lock
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