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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="GUID-66402932-5C44-556B-A7AC-1C2D245C8B05" xml:lang="en"><title>Clocks and
Timers Tutorial</title><prolog><metadata><keywords/></metadata></prolog><conbody>
<p>You can use the clock and timer APIs to schedule tasks that require sub-second
granularity. When a timer expires it can send a signal to its calling process. </p>
<p>The following topics describe how you can use the clock and timer APIs
when you develop POSIX compliant applications or port POSIX-based applications
onto the Symbian platform. </p>
</conbody></concept>