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Article #82Re: Re-entrancy Re-visited
From: Henry Spencer
Date: Tue, 11 Mar 1986 22:34
Date: Tue, 11 Mar 1986 22:34
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> The only safe things to do in an interrupt routine are
> - setting the InterruptHasOccurred flag,
> - longjmp
> - exit.
Actually, neither longjmp nor exit is 100% safe. Longjmp will get you
out fairly safely (unless your function-calling sequence has an interrupt
window, like the V7 pdp11 one did [fixed in SysV]), but things may still
be in a mess inside whatever was interrupted, with disastrous results the
next time you call it. And exit invokes stdio's cleanup routine, which
might run afoul of the same problem. _exit should be safe.
--
Henry Spencer @ U of Toronto Zoology
{allegra,ihnp4,linus,decvax}!utzoo!henry
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!henry From: henry@utzoo.UUCP (Henry Spencer) Newsgroups: net.lang.c++ Subject: Re: Re-entrancy Re-visited Message-ID: <6490@utzoo.UUCP> Date: Tue, 11-Mar-86 17:34:05 EST Article-I.D.: utzoo.6490 Posted: Tue Mar 11 17:34:05 1986 Date-Received: Tue, 11-Mar-86 17:34:05 EST References: <34200005@orstcs.UUCP>, <6812@boring.UUCP> Organization: U of Toronto Zoology Lines: 14