|ptr||Pointer to data to AND atomically.|
|mask||Value to AND with existing value.|
OSAndAtomic performs an atomic AND with a value in memory.
This is useful if the value needs to be atomically manipulated by multiple processors.
It does not act as a memory barrier.
2013-05-08 Automated cleanup pass.
2012-07-25 Cleanup Pass
2010-08-30 Initial version.