|ptr||Pointer to data to add or subtract atomically.|
|val||Signed value to add atomically to the value in memory.|
OSAddAtomic performs an atomic addition 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
2012-05-04 Match actual prototype.
2010-08-30 Initial version.