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Date: Fri, 22 Aug 2014 12:37:27 +0200
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Latest snapshot
Message-ID: <20140822103727.GB12878@calimero.vinschen.de>
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Hi snapshot users,

the latest snapshot on https://cygwin.com/snapshots/, 2014-08-22,
contains a massive change in exception handling.

It uses a new, preprocessor-based __try/__except implementation along
the lines (but not exactly) of how it can be used in  Visual C++.  This
replaces the former, 32 bit centric technique to catch SEGVs in Cygwin
code to return EFAULT rather than crashing if, for instance, the
application supplied invalid pointers to system calls.

The new __try/__except implementation allows to perform this exception
handling using Windows SEH.  For now this is done only on 64 bit, while
32 bit still uses the former SJLJ technique.  On 64 bit this has the
major advantage that the execption handling is entirely free of overhead
in the non-exception case.

If you test this snapshot and you see changes in behaviour, please report
here.  The most dreaded error message would be something like this:

  Internal error: TP_NUM_C_BUFS too small

This message already existed before, but the changes *might* have
raised the chance to encounter it, if it's done wrong.

Be brave, I already tried to run X with these changes, and the psproc
package I released yesterday has been built with these changes, too.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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