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SubjectRe: Netscape broken with 2.2.0-pre7
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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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