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