PWS Headless Crashes

Peter William Lount peter at
Wed Aug 25 20:56:57 UTC 1999


After applying this change the image won't even open in a gui squeak vm!!!
Woops... Good thing I had a backup...

Peter William Lount
peter at

From: Michael Rueger <Michael.Rueger.-ND at>
To: peter at
Cc: Squeak Mail List <squeak at>
Subject: Re: PWS Headless Crashes
Date: August 25, 1999 1:36 PM

Peter William Lount wrote:

> I've added PWS class>startUp to the SystemDictionary>processStartUpList
> PWS startUp
>         PWS serveOnPort: 8080 loggingTo: 'log8080.txt'.

This is due to a bug in the way Squeak handles the startup
initialization. Andreas and I chased this problem for a while until
Andreas finally found it.

The problem is, that the startup list is processed *before* the external
object array gets initialized. So when you work with e.g. Sockets in the
startup list these entries are overwritten in the clearExternal objects
leading to arbitrary crashes.

Attached is an (unofficial) fix for this. There will be an updated VM
and the corresponding fixes coming up as soon as Andreas has the time to
consolidate the 2.5 VM.



 "To improve is to change, to be perfect is to change often." 
                                            Winston Churchill
| Michael Rueger                                             |
| Phone: ++1 (818) 623 3283        Fax:   ++1 (818) 623 3559 |
+--------Michael.Rueger.-ND at'From Squeak
2.5 of August 6, 1999 on 25 August 1999 at 1:32:38 pm'!

!SystemDictionary methodsFor: 'snapshot and quit' stamp: 'ar 8/19/1999
snapshot: save andQuit: quit
	"Mark the changes file and close all files. If save is true, save the
current state of this Smalltalk in the image file. If quit is true, then
exit to the outer shell. The latter part of this method runs when resuming
a previously saved image. The resume logic checks for a document file to
process when starting up."

	| resuming msg sourceLink |
	save & (SourceFiles at: 2) notNil ifTrue:
		[msg _  (quit
			ifTrue: ['----QUIT----']
			ifFalse: ['----SNAPSHOT----'])
			, Date dateAndTimeNow printString.
		sourceLink _ ' priorSource: ' , LastQuitLogPosition printString.
		self assureStartupStampLogged.
		LastQuitLogPosition _ (SourceFiles at: 2) setToEnd; position.
		self logChange: msg , sourceLink.
		Transcript cr; show: msg].

	self processShutDownList.
	Cursor write show.
		ifTrue: [resuming _ self snapshotPrimitive]  "<-- PC frozen here on image
		ifFalse: [resuming _ false].
	quit & resuming not ifTrue: [self quitPrimitive].
	Cursor normal show.
	self setGCParameters.
	resuming ifTrue: [self clearExternalObjects].
	self processStartUpList.
	resuming ifTrue: [self readDocumentFile].
	^resuming! !

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