Christopher Faylor wrote: > On Thu, Oct 08, 2009 at 07:18:49AM -0400, Charles Wilson wrote: >> is it possible that cygwin >> is overzealously inserting the _cygtls::call2() function into the return >> frame stack? Does cygwin manipulate the TIB, even for threads created >> by direct calls to CreateThread? > > Uh, yeah. If you are not using Cygwin methods to start threads then it > is entirely likely that there will be problems, just like if you use > non-Cygwin methods to do I/O.
I see. >> Any suggestions? (Other than an STC. I'll put one together after I get >> some sleep). OK, I've got a *really* simple test case -- more of a sanity check, really -- below. >> This is coming up because any tcl app that I've built -- including >> insight -- always dies on exit, as tcl is shutting down its various >> utility threads. > > So why isn't this a problem with the current version of insight then? I believe it /is/ a problem, at least on cygwin-1.7. I've tried to restore my system to "normal", and I see a different behavior on cygwin-1.5 and cygwin-1.7 with the test below. [1.5] $ /usr/bin/wish84.exe /usr/share/tk8.4/demos/hello Hello, world works fine. You should see a small window pop up. When you click the button, "Hello, sorld" is printed to the console and the small window disappears. The application exits with no problem. [1.7] $ /usr/bin/wish84.exe /usr/share/tk8.4/demos/hello Hello, world Segmentation fault (core dumped) Again, you should see a small window pop up. When you click the button, "Hello, sorld" is printed to the console and the small window disappears. But then, the application segfaults. Similarly, for insight.exe: [1.5] $ insight.exe <then choose File->Exit> and the application exits without error. But on 1.7: [1.7] $ insight.exe <then choose File->Exit> Segmentation fault (core dumped) Can anybody verify this behavior for me, to make sure I haven't somehow left dregs of my X-based tcl/tk packages lying around on my system? -- Chuck -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple