7.15.6 Handlers and processes

Prev Up Next Page 268 of 800 Search internet

The exec request ( p , h ) event makes the machine evaluate the process p and, when that is interrupted, the handler h. Hence, h corresponds to an interrupt handler and p corresponds to a less privileged process. The handler h has full control over the machine in that it receives all input, generates all output, and cannot be interrupted.

Potentially, one can implement an operating system as a Logiweb machine. In that case, the handler is the interrupt handler of the operating system which runs with interrupts disabled and the process p must take care of all other processing, including user processes, operating system processes, driver processes, and the interruptible parts of interrupt handlers.

Prev Up Next Page 268 of 800 Search logiweb.eu

Copyright © 2010 Klaus Grue, GRD-2010-01-05