• IO

  • Blocking vs non-blocking vs multiplexing (2+ calls) vs async (AIO)

    

    

    

    

Linux kernel IO

• AIO: POSIX AIO - glibc v2.1, 1999, and native Linux AIO (KAIO or libaio) - Linux v2.6, 2003
• POSIX AIO calls: user land, portable to any OS, implemented with threads
  • Setup/teardown: none
  • Submission: aio_read, aio_write, aio_fsync
  • Status: aio_return, aio_error, aio_suspend, aio_cancel
• Linux KAIO calls: kernel mode, works only on directed-IO
  • Setup/teardown: io_setup, io_destroy
  • Submission: io_submit
  • Status: io_getevents
• io_uring