From: Andre Fachat (a.fachat_at_gmx.de)
Date: 2003-08-24 21:51:29
On Sun, Aug 24, 2003 at 09:28:32PM +0200, Ullrich von Bassewitz wrote: > > On Sun, Aug 24, 2003 at 04:33:20PM +0200, Andre Fachat wrote: > > - or on the latency. Switching between tasks/threads in GeckOS > > was simply taking too much time to use more than IIRC 9600. > > So you did all interrupt handling in threads? Maybe adding an upper/bottom > half interrupt handler would have been an idea. No threads. There already is bottom half that takes the bytes and puts them into a so-called stream. There is no upper half, though: that's basically the application reading from the stream. The problem was I think the context switch time between program space (i.e. a process with its own stack/memory) and kernel. For the context switch you have to do some things (changing stack pointer, rearranging MMU in some architectures etc) so you have to save the registers and restore them and all that. Thinking about it now, I may have been able to make that IRQ save, but that was then... Andre Message was sent through the cbm-hackers mailing list
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