Priority Ceiling Protocol - ICPP Versus OCPP

ICPP Versus OCPP

The worst-case behaviour of the two ceiling schemes is identical from a scheduling view point. However, there are some differences :

• ICPP is easier to implement than OCPP, as blocking relationships need not be monitored
• ICPP leads to less context switches as blocking is prior to first execution
• ICPP requires more priority movements as this happens with all resource usage
• OCPP changes priority only if an actual block has occurred