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RE: rw_lock vs mutex

On Thu, 2 Feb 2012, wrote:

A rw_lock allows multiple readers, correct? If there's a non-trivial probability of concurrent reads that would make a difference. If not, then a mutex would be just as good especially if that is lower overhead.

The rwlock in question is contained with the driver's softc. The only exported accessors are i2c_bus_acquire() (which grabs a RW_WRITER lock) and i2c_bus_release().

A mutex makes much more sense.

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