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| -rw-r--r-- | doc/1.md | 7 |
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@@ -148,3 +148,10 @@ the users can interact with each program while it is running. A program laoded into memory and executing is called a process. When a process executes, it typically executes for only a short time before it either finishes or needs to perform I/O. + +Modern operating systems are interrupt driven. +Events are almost always signaled by the occurrence of an interrupt or a trap. + +A trap, or an exception, is a software generated interrupt caused either by +an error or by a specific request from a user program that an operating-system +service be performed. |