Messages in this thread | | | Date | Wed, 5 May 1999 11:49:52 +0100 | From | Derek Fawcus <> | Subject | Re: Mark Russinovich's reponse Was: [OT] Comments to WinNT Mag !! (fwd) |
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On Wed, May 05, 1999 at 08:37:33AM +1000, Richard Gooch wrote: > Mark H. Wood writes: > > > > Ugh. I liked the VMS model here. When you queue an I/O request, > > one of the things you can attach to it is the address of a > > procedure. When the request completes, the kernel creates a > > temporary thread to execute the I/O rundown code, and part of that > > rundown is to call the procedure you supplied.
> What was the cost of creating the "temporary thread"? Anyway, we can > do much the same thing with signals, except we don't need to create a > temporary thread.
If they're anything like the similar model I used with FlexOS (aka CDOS) then the 'temporary thread' was actually more like a signal handler.
In FlexOS these things (called SWI's) would interrupt the main line of execution in the process, but only one could be active at a time.
DF -- Derek Fawcus derek@spider.com Spider Software Ltd. +44 (0) 131 475 7034
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