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I was thinking about doing this for an event loop I was working on, but no code to show yet... you probably can get away easily with using pthreads and a sparse

• cycloptic 6y ago
  (Reply since I can't edit anymore) The only catch is that with that approach, you can't poll on the fd like you can with the real thing.
  • pengaru 6y ago
    Assuming you're talking about emulating io_uring in userspace at the liburing API level, couldn't you just use a pthreads thread pool for the syscall dispatching from submitted SQEs, and when those complete their results get serialized into the CQE. For fd-based monitoring of the CQE, wouldn't a simple pipe or eventfd suffice? When CQEs get added, write to the fd, it just happens to all be in-process. I must admit I haven't gone deep into the liburing internals or the low-level io_uring API, but conceptually speaking there doesn't seem to be anything happening that can't be done in-process in userspace atop pthreads for the blocking syscalls. It just won't be fast. Am I missing some critical show-stopping detail?