I never did the disabled loop thing. My special purpose O/S was of the enabled sort; however, it did not use TSCH or STCH, it was in the SIOF era. It is nice to see that CP optimizes the loop, so to speak.
Regards, Richard Schuh > > A TSCH loop is used when you are disabled for interrupts (and > don't feel like enabling) in response to CC=0 from SSCH. CP > is smart enought to detect a TSCH loop and place the virtual > machine in a semi-enabled wait. > If you are enabled for I/O interrupts you issue a single TSCH > or STSCH *in the FLIH* to read and clear the interrupt > status. The SLIH will typically drive a callback of some sort. > > Alan Altmark > z/VM Development > IBM Endicott >
