kopia lustrzana https://gitlab.com/sane-project/website
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3.7 KiB
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77 wiersze
3.7 KiB
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<!-- received="Fri Feb 26 07:07:43 1999 PST" -->
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<!-- sent="Fri, 26 Feb 1999 17:06:29 +0200" -->
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<!-- name="Milon Firikis" -->
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<!-- email="milonf@ariadne-t.gr" -->
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<!-- subject="Re: Porting SANE backends" -->
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<title>sane-devel: Re: Porting SANE backends</title>
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<h1>Re: Porting SANE backends</h1>
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<b>Milon Firikis</b> (<a href="mailto:milonf@ariadne-t.gr"><i>milonf@ariadne-t.gr</i></a>)<br>
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<i>Fri, 26 Feb 1999 17:06:29 +0200</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#186">[ date ]</a><a href="index.html#186">[ thread ]</a><a href="subject.html#186">[ subject ]</a><a href="author.html#186">[ author ]</a>
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<li> <b>Next message:</b> <a href="0187.html">Matt Mozur: "Re: UMAX Astra 1200S lamp question"</a>
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<li> <b>Previous message:</b> <a href="0185.html">Svend Daugaard Pedersen: "Re: Porting SANE backends"</a>
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<li> <b>Maybe in reply to:</b> <a href="0178.html">Svend Daugaard Pedersen: "Porting SANE backends"</a>
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<li> <b>Next in thread:</b> <a href="0190.html">Oliver Rauch: "Re: Porting SANE backends"</a>
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</ul>
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Oliver Rauch wrote:<br>
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<i>> </i><br>
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<i>> Svend Daugaard Pedersen wrote:</i><br>
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<i>> </i><br>
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<i>> > - don't use 'alloca()'</i><br>
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<i>> > this routine is not an ANSI routine and it is difficult</i><br>
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<i>> > (in many cases impossible) to implement in a C system not</i><br>
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<i>> > having it.</i><br>
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<i>> ></i><br>
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<i>> </i><br>
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<i>> Thats no problem, changed it in the umax backend.</i><br>
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<i>> </i><br>
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<i>> > - don't use 'fork()' and related routines</i><br>
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<i>> > if you feel it is necessary, do it in a way that makes it</i><br>
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<i>> > easy to change the code (snapscan.c is a good example) or</i><br>
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<i>> > better: make this part of the code conditional.</i><br>
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<i>> ></i><br>
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<i>> </i><br>
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<i>> What is the problem with fork. The amiga has a multi-tasking system, soI don`t</i><br>
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<i>> understand the problem.</i><br>
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<p>
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Well win32 is also a multitasking system (sort of) but it does not have<br>
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fork(). What I want to say is that fork() is defined bu Unix and Posix<br>
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implementations but it is not a LibC or an ANSI C routine such as<br>
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malloc. The only reason that this (kernel) function is being used in<br>
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backends is to prevent the blocking of the frontend application during<br>
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the sanei_scsi_read. AFAIK fork() has already give some problems with<br>
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the OS/2 port where the fork() is very expensive.<br>
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<p>
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The proper way to resolve this is to make a wrapper much like the way<br>
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sanei_scsi_* routines work. This way when somebody wants to port SANE in<br>
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a new platform he should code only the implementation around the wrapper<br>
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which is system dependent. I should say it again that the sanei_scsi*<br>
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routines are the perfect example of an analogous implementation.<br>
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<p>
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MF<br>
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<p>
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<pre>
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--
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Source code, list archive, and docs: <a href="http://www.mostang.com/sane/">http://www.mostang.com/sane/</a>
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To unsubscribe: echo unsubscribe sane-devel | mail <a href="mailto:majordomo@mostang.com">majordomo@mostang.com</a>
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</pre>
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<!-- body="end" -->
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0187.html">Matt Mozur: "Re: UMAX Astra 1200S lamp question"</a>
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<li> <b>Previous message:</b> <a href="0185.html">Svend Daugaard Pedersen: "Re: Porting SANE backends"</a>
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<li> <b>Maybe in reply to:</b> <a href="0178.html">Svend Daugaard Pedersen: "Porting SANE backends"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0190.html">Oliver Rauch: "Re: Porting SANE backends"</a>
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<!-- reply="end" -->
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</ul>
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