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    further extensible to other mechanisms.</para>
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    further extensible to other mechanisms.</para>
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    <para>Userspace tasks depend on support of address spaces provided by the
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    <para>Userspace tasks depend on support of address spaces provided by the
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    kernel. Each address space is a set of mutually dijunctive address space
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    kernel. Each address space is a set of mutually dijunctive address space
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    areas that group pages of common attributes. An address space area is
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    areas that group pages of common attributes. An address space area is
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    usually connected to, and backed by, an anonymous memory or an executable
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    usually connected to, and backed by, anonymous memory, executable image of
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    some program or continuous region of physical memory. However, swapping
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    image of some program. Anonymous memory address space areas can be easily
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    pages in and out to external memory is not supported. Address space areas
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    shared among address spaces.</para>
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    can be easily shared among address spaces.</para>
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  </section>
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  </section>
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  <section>
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  <section>
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    <title>IPC</title>
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    <title>IPC</title>
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