Ken Brown writes: > ...
> The main change was that we stopped using Win32 Overlapped I/O > (https://docs.microsoft.com/en-us/windows/win32/sync/synchronization-and-overlapped-input-and-output) > and switched to using the NT API. As a result, pipe I/O became much > more efficient. It wouldn't surprise me if the efficiency alone is > what exposed the bug. > > The good news is that the bug doesn't seem to occur in XEmacs 21.4 > (on 32-bit Cygwin). So one way to approach this would be to bisect > the XEmacs git repo to find the commit that introduced the bug. > You'd probably have to do the work on 32-bit Cygwin since, if I > remember correctly, XEmacs 21.4 didn't build on 64-bit Cygwin. Right, although I _suspect_ it will be in 64-bit-only code. Easy enough to find out, once I resurrect a 32-bit install on a spare machine that I can run 3.3 on (I use XEmacs all day every day from my day job, so I need to stay with 3.2 until we fix this). So, this may take a while, unless someone else hits the problem and finds a simpler test case. Thanks again, ht -- Henry S. Thompson, School of Informatics, University of Edinburgh 10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440 Fax: (44) 131 650-4587, e-mail: h...@inf.ed.ac.uk URL: http://www.ltg.ed.ac.uk/~ht/ [mail from me _always_ has a .sig like this -- mail without it is forged spam] The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple