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64 wiersze
3.1 KiB
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<!-- received="Sun Jul 27 08:11:16 1997 MST" -->
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<!-- sent="Sun, 27 Jul 1997 08:02:56 -0700" -->
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<!-- name="David Mosberger-Tang" -->
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<!-- email="davidm@azstarnet.com" -->
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<!-- subject="Re: sane-0.62 released" -->
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<!-- id="199707271502.IAA03269@panda.mosberger" -->
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<!-- inreplyto="199707270737.JAA02727@cave.BitWizard.nl" -->
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<title>sane-devel: Re: sane-0.62 released</title>
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<h1>Re: sane-0.62 released</h1>
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<b>David Mosberger-Tang</b> (<a href="mailto:davidm@azstarnet.com"><i>davidm@azstarnet.com</i></a>)<br>
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<i>Sun, 27 Jul 1997 08:02:56 -0700</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#143">[ date ]</a><a href="index.html#143">[ thread ]</a><a href="subject.html#143">[ subject ]</a><a href="author.html#143">[ author ]</a>
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<li> <b>Next message:</b> <a href="0144.html">David Mosberger-Tang: "Re: sane-0.62 released"</a>
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<li> <b>Previous message:</b> <a href="0142.html">Rogier Wolff: "Re: sane-0.62 released"</a>
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<li> <b>In reply to:</b> <a href="0141.html">Rogier Wolff: "Re: sane-0.62 released"</a>
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<li> <b>Next in thread:</b> <a href="0142.html">Rogier Wolff: "Re: sane-0.62 released"</a>
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</ul>
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<!-- body="start" -->
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<i>>>>>> On Sun, 27 Jul 1997 09:37:21 +0200 (MET DST), <a href="mailto:R.E.Wolff@BitWizard.nl">R.E.Wolff@BitWizard.nl</a> (Rogier Wolff) said:</i><br>
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<p>
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Rogier> nread = read (s->pipe, buf, max_len);<br>
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Rogier> DBG(3, "read %ld bytes\n", (long) nread);<br>
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<p>
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Rogier> if (!s->scanning)<br>
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Rogier> return do_stop (s);<br>
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<p>
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Note that sane_cancel() can be called asynchronously from a signal<br>
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handler. This means that sane_cancel() may be called while waiting<br>
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for data in the read() syscall. When this happens, sane_cancel() will<br>
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kill the reader-process and set s->scanning to FALSE, but it will not<br>
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do any other cleanup (since that wouldn't be safe without additional<br>
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"locking"). Once the main-process recognizes that scanning has been<br>
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cancelled (!s->scanning is TRUE), it does the remaining clean up by<br>
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calling do_stop().<br>
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<p>
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The reason s->scanning() does not get checked _before_ read() is<br>
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called is because the frontends will not call sane_read() after<br>
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cancelling the scan (well, it wouldn't hurt to check anyways, I<br>
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suppose).<br>
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<p>
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--david<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.azstarnet.com/~axplinux/sane/">http://www.azstarnet.com/~axplinux/sane/</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="0144.html">David Mosberger-Tang: "Re: sane-0.62 released"</a>
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<li> <b>Previous message:</b> <a href="0142.html">Rogier Wolff: "Re: sane-0.62 released"</a>
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<li> <b>In reply to:</b> <a href="0141.html">Rogier Wolff: "Re: sane-0.62 released"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0142.html">Rogier Wolff: "Re: sane-0.62 released"</a>
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<!-- reply="end" -->
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</ul>
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