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<!DOCTYPE concept

  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-687997B5-BDFD-49D1-947B-4AB21C3AF58C" xml:lang="en"><title>The

Running Model</title><shortdesc>This document describes the model by which a device driver handles

requests.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<section id="GUID-697C8B0A-2468-4699-82FF-2E02E3F857A0">      

      <p>Once a logical channel and a physical channel, if appropriate, have

been created and initialised, the driver is ready to handle requests. </p> <p>On

the kernel-side, requests can be handled by one or more kernel-side threads,

allowing for rich and complex behaviour. Alternatively, if appropriate, a

request can be handled by code running in the context of the client user-side

thread, but running in supervisor mode. </p> <p>There are two kinds of request,

synchronous and asynchronous. </p>     </section>

</conbody></concept>