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Next
Previous
Contents
12. IRQ12.1 OverviewIRQ is an asyncronous signal sent to microprocessor to advertise a requested work is completed
12.2 Interaction schema
|<--> IRQ(0) [Timer]
|<--> IRQ(1) [Device 1]
| ..
|<--> IRQ(n) [Device n]
_____________________________|
/|\ /|\ /|\
| | |
\|/ \|/ \|/
Task(1) Task(2) .. Task(N)
IRQ - Tasks Interaction Schema
What happens?A typical O.S. uses many IRQ signals to interrupt normal process execution and does some housekeeping work. So:
Under Linux, when an IRQ comes, first the IRQ wrapper routine (named "interrupt0x??") is called, then the "official" IRQ(i)_handler will be executed. This allows some duties like timeslice preemption.
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This document, LDP HOWTO-INDEX, is copyrighted (c) 1995 - 2002 by Tim Bynum, Guylhem Aznar, Joshua Drake and Greg Ferguson. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is available at http://www.gnu.org/copyleft/fdl.html. If you have questions, please contact the LDP.
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