gstreamer/docs/manual/schedulers.xml

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<chapter id="cha-scheduler">
<title>Understanding schedulers</title>
<para>
The scheduler is responsible for managing the plugins at runtime. Its
main responsibilities are:
<itemizedlist>
<listitem>
<para>
Preparing the plugins so they can be scheduled.
</para>
</listitem>
<listitem>
<para>
Monitoring state changes and enabling/disabling the element in the
chain.
</para>
</listitem>
<listitem>
<para>
Choosing an element as the entry point for the pipeline.
</para>
</listitem>
<listitem>
<para>
Selecting and distributing the global clock.
</para>
</listitem>
</itemizedlist>
</para>
<para>
The scheduler is a plugable component; this means that alternative
schedulers can be written and plugged into GStreamer. The default scheduler
uses cothreads to schedule the plugins in a pipeline. Cothreads are fast
and lightweight user-space threads.
</para>
<para>
There is usually no need to interact with the scheduler directly, however
in some cases it is feasible to set a specific clock or force a specific
plugin as the entry point in the pipeline.
</para>
</chapter>