Article View: comp.sys.amiga.tech
Article #5667Re: Task Switching Problem
From: Raymond S. Brand
Date: Sun, 07 Oct 1990 18:15
Date: Sun, 07 Oct 1990 18:15
26 lines
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1761 bytes
In article <14906@cbmvax.commodore.com>, rsbx@cbmvax.commodore.com (Raymond S. Brand) writes: > > This probably isn't a problem since the amount of time spent handling > interrupts is small compared to the quantum. However, there is another problem, > exec reschedules the tasks after interrupts. So in practice, the time spent > handling interrupts and your task timing functions could be of comparable size > to the time spent actually executing the task code. The scheduler in the 2.0 exec has been fixed so that it nolonger reschedules tasks when it doesn't need to. 1.3, however, still has the problem. :-( What was happening is that anytime the internal AddTask, Permit, or Signal functions were called (mostly by the external functions of the same name), a reschedule happened. Signal is used by a number of interrupt handlers and servers, either directly or indirectly through passing messages. > rsbx rsbx ------------------------------------------------------------------------ Raymond S. Brand rsbx@cbmvax.commodore.com Commodore-Amiga Engineering ...!uunet!cbmvax!rsbx 1200 Wilson Drive (215)-431-9100 West Chester PA 19380 "Looking" ------------------------------------------------------------------------
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rutgers!bagate!cbmvax!rsbx From: rsbx@cbmvax.commodore.com (Raymond S. Brand) Newsgroups: comp.sys.amiga.tech Subject: Re: Task Switching Problem Summary: correction and more information Message-ID: <14930@cbmvax.commodore.com> Date: 7 Oct 90 18:15:51 GMT References: <1990Sep21.180100.28580@uncecs.edu> <14593@cbmvax.commodore.com> <14906@cbmvax.commodore.com> Organization: Commodore-Amiga Inc, West Chester, PA Lines: 26