Note: Software interrupts are primarily intended for application debugging. It is not feasible for a user process to generate interrupts with the kind of regularity that a real-time scheduler requires. To use software interrupts as a time base, specify FRS_INTRSOURCE_USER to frs_create().
Caution: The use of software interrupts has a potential for causing a system deadlock if the interrupt-generating process contends for a resource that is also used by a frame-scheduled activity process. If any activity process calls IRIX system functions, the only way to be absolutely sure of avoiding deadlock is for the interrupt-generating process to avoid using any IRIX system functions. Note that C library functions such as printf() invoke system functions, and can lead to deadlocks in this case.