>For one, it had a forbid() system call which would stop the scheduler from pre-empting the current running process. This is, by the way, equivalent to SCHED_F

>For one, it had a forbid() system call which would stop the scheduler from pre-empting the current running process. This is, by the way, equivalent to SCHED_FIFO on Linux. There are very legitimate reasons a hard realtime task may need to be non-interruptable.