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    SubjectRe: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

    * Michael K. Edwards <medwards.linux@gmail.com> wrote:

    > 1) Documentation of what you can and can't do safely from a threadlet,
    > given that it runs in an unknown thread context;

    you can do just about anything from a threadlet, using bog standard
    procedural programming. (Certain system-calls are excluded at the moment
    out of caution - but i'll probably lift restrictions like sys_clone()
    use because sys_clone() can be done safely from a threadlet.)

    The code must be thread-safe, because the kernel can move execution to a
    new thread anytime and then it will execute in parallel with the main
    thread. There's no other requirement.

    Wrt. performance, one good model is to run request-alike functionality
    from a threadlet, to maximize parallelism.

    ingo
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