Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!zephyr.ens.tek.com!tektronix!nosun!qiclab!m2xenix!puddle!p101.f4.n494.z5.fidonet.org!Pat.Terry From: Pat.Terry@p101.f4.n494.z5.fidonet.org (Pat Terry) Newsgroups: comp.lang.modula2 Subject: questions Message-ID: <1411.26EB6495@puddle.fidonet.org> Date: 10 Sep 90 03:28:39 GMT Sender: ufgate@puddle.fidonet.org (newsout1.26) Organization: FidoNet node 5:494/4.101 - Settler City Fido, Grahamstown RSA Lines: 25 In a message of , miguel angel lozano writes: > - Why is necesary the usage of the priority in the concurrent >processes > or how it is used? Can send me an example? It is often used as an interrupt mask - the number which is used as a priority is inevitably machine specific, and prevents code in the module from being interrupted by particular interrupt sources. For example, a system that did round robin schedulling on a set of processes would not want the scheduling routine to be interrupted until it had finished handling the clock interrupt (in particular it would not want to be interrupted by another clock interrupt) > - Can explain me something about the IMPORT and EXPORT declarations? Wow, that is a big one, as it is fundamental to the whole language. Have you got hold of any introductory text book? -- uucp: uunet!m2xenix!puddle!5!494!4.101!Pat.Terry Internet: Pat.Terry@p101.f4.n494.z5.fidonet.org