PPT Slide
Program Error Interrupt Handler
- Invoked when a program attempts an illegal operation
- In SOS, we forcibly remove the process from the process table.
- JavaSOS does the same thing (code in SOSProgErrIntHandler.java, where else? :)
Disk Driver Subsystem
- DiskIO() is called from the System call interrupt handler when a Read or Write of the disk is requested. (Look in SOSDiskDriver.java for JavaSOS).
- Since disk is a slow device we can’t afford to have the machine wait in the current system call.
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