On-Chip Timer Interrupt

On-Chip Timer Interrupt

Each processor chip contains a free-running timer that is used by IRIX for normal process scheduling. This timer is not synchronized between processors, so it cannot be used to drive multiple synchronized schedulers. The on-chip timer can be used as a time base when only one CPU is used and there is a reason to not use the high-precision timer described in the next topic.

To use the on-chip timer, specify FRS_INTRSOURCE_R4KTIMER as the interrupt source, and the minor frame interval in microseconds, to frs_create().