Messages in this thread | | | Date | Mon, 21 Jul 2003 10:38:38 -0400 (EDT) | From | "Richard B. Johnson" <> | Subject | Re: SVR4 STREAMS (for example LiS) |
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On Mon, 21 Jul 2003, Ihar "Philips" Filipau wrote:
> Hello All! > > I have little bit theoretical question. As usual ;-) > > From what ever piece of doc I see says that STREAMS are good. > They are part of SUS (at least v3 has them). > Sun's docs reffering only cases when one may want to use them. > This was the first pointer to problems: docs are missing the > "dark side" of STREAMS. > > Can anyone give any pointers to information why STREAMS are _not_ > part of Linux kernel yet? > (Besides that no-one needs/merged it in kernel ;-) > What kind of problems this implementation of I/O has? > (Low performance and high latencies I expect - but what's else?) > > Any sort of RTFM will be very appreciated. > > Thanks in advance. >
Streams are an extension of buffered I/O implimented by the 'C' runtime library. Streams really have nothing to do with the internal workings of kernel I/O. As far as kernel I/O goes, one reads() and writes() from user-space.
That said, the kernel provides getpmsg and putpmsg functions to support streams. You really can't do much more for streams inside the kernel and be efficient.
Cheers, Dick Johnson Penguin : Linux version 2.4.20 on an i686 machine (797.90 BogoMips). Note 96.31% of all statistics are fiction.
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