Another factor in the jigsaw is that many add-ons, such as record and hard pushes, can also work separately. An I/O endeavor such as examining from a drive can be activated by program call in plan A and eventually left to run separately while the os tests its desk of hanging tasks and decides which of those that are “runnable”
Device stops are mail messages that program add-ons deliver to the CPU, informing it that they need its interest. For example, when you click a key on your key pad, the laptop key pad shops the value of the key stroke and deliver an stop to the CPU, informing it that it has information awaiting it. As the name indicates, a stop can happen whenever they want, and the kernel must take observe of it even if no immediate reboot of plan A is possible. The kernel’s respond to the stop in this case would be modify the position of plan A from “waiting for drive read” to “runnable”
Peeling off these greatly stacked red onion levels is a complicated business; the key is to have an overall image and lots of trust. Fortunately, Unix provides you some simple orders that let you run as many applications as you wish and keep a record of their success.
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