Messages in this thread | | | Subject | Re: Netscape broken with 2.2.0-pre7 | Date | Sat, 16 Jan 1999 16:24:08 -0500 | From | "Brandon S. Allbery KF8NH" <> |
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In message <19990116204908.A1473@tantalophile.demon.co.uk>, Jamie Lokier writes : +----- | On Fri, Jan 15, 1999 at 09:35:46PM -0600, Joseph Anthony wrote: | > Every thing is ok with me (pre7) Netscape 4.08 | > Debian 2.0 | | I have checked, the problem is still present with Netscape 4.08. | (netscape-navigator-4.08-1.i386.rpm as distributed by Red Hat). | | Further tracing reveals that the regular, high speed SIGALRM signals are | quite normal -- netscape receives them all the time. It sets a timer | requesting them every 50ms, though it only receives them every 70ms. +--->8
FWIW, I see the following on both 4.05 Solaris and 4.08 Linux: occasionally Netscape "freezes", and forcing it to receive an X event (usually by moving the mouse into or out of its frame, since I run with backing store) unfreezes it. Sometimes this must be repeated a few times before it notices.
This along with your report makes me think that Netscape is doing something *really* stupid such as internal preemptive multitasking with the pipe feeding a scheduler routine which looks to see what requested scheduling by writing to the pipe and dispatches with longjmp() or abuse of throw/catch. The possible failure modes, if anything doesn't work exactly as the author(s) predicted, are mind-boggling.
So pre7 does something Netscape doesn't quite expect --- it may well be *valid*, just not what they tuned the above monstrosity for on Linux --- and Netscape goes into a tailspin. Surprise.
I always wondered how they simulated multithreading. Somehow I think I now know... it seems just about repulsive enough to fit :-)
-- brandon s. allbery [os/2][linux][solaris][japh] allbery@kf8nh.apk.net system administrator [WAY too many hats] allbery@ece.cmu.edu carnegie mellon / electrical and computer engineering KF8NH We are Linux. Resistance is an indication that you missed the point.
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