Squeak-dev June 1998

squeak-dev@lists.squeakfoundation.org

83 participants
130 discussions

Set author initials -> Recall my initials!
by sqrmax＠cvtci.com.ar 23 Jun '98

23 Jun '98

Hi. I have two places where I squeak up my life. First, here at home. Second, out there at work when I have nothing to do. To be able to work on a single image, I usually copy it between both places so I always work as if I squeaked on a single machine. But something strange happens. Although I copy the image and the changes, each time I transfer the image from one machine to another, Squeak drops my initials on the floor (ie, I have to retype them). Why is this strange behavior??? Andres.

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Status Report: Generating Native Code
by Hans-Martin Mosner 22 Jun '98

22 Jun '98

Hello everybody, as of Saturday, I'm able to compile primitives to native code dynamically. Although my compiler does not do any optimizations yet, I've seen speed improvement factors of 50-100 for string operations such as crc16 or beginsWith: This is currently for the PowerPC only, and only supports integer arithmetics, string access primitives, and Object>>at: so that I could use the literal Array in crc16. I will add signed short and unsigned long operations soon so that primitives working on Bitmaps and SoundBuffers can be written. My next plans are to streamline the calling mechanism to use C macros defined in a header file instead of external functions, so that an unnecessary function can can be avoided. I will write the macro definitions for 68K and x86 calling so that the VM porting guys can include them in their VMs while (hopefully) somebody starts writing code generators for their respective processors. Since float ops are not implemented yet, it seems too early to start working on other platforms, but if somebody wants to look at the code and start anyway, just send me a mail. Hans-Martin

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Re: garbage collection in a distributed environment
by Peter Su 22 Jun '98

22 Jun '98

A while back, the Modula-3 effort built a system called Network objects that had a pretty decent scheme for distributed GC. check out the DEC SRC web pages for the papers while SRC still exists. :) Anyway, the basic idea was that the each local GC would keep track of which objects on a machine had been exported to another machine. You would keep a dummy handle on each of these objects to keep them from being GC'd locally, and you'd keep a reference count on each exported object handle to keep track of the # of remote references. If the reference count goes to zero, you throw the handle away and allow the object to be GC'd locally. This algorithm is tuned for the case where not too many objects are remotely exported, and for the case where there are no export cycles. I think this is pretty reasonable. For persistent GC, there is a thesis from CMU by Scott Nettles that discusses persistent GC and transaction processing in the context of ML that is pretty good. The Exodus project at wisconsin also published at least one paper about this. And the Object database group at UMass has probably looked into it some as well. Pete -----Original Message----- From: Patrick Logan <patrickl(a)servio.gemstone.com> To: squeak(a)cs.uiuc.edu <squeak(a)cs.uiuc.edu> Date: Friday, June 19, 1998 3:16 PM Subject: Re: garbage collection in a distributed environment >I think there is an interesting paper or two from U. Mass. about >distributed GC. > >Paul Wilson's site at U. Texas may have something about persitent GC >if not distributed. > >If you have Gemstone documentation, there is information about the >functioning, but not the implementation, of its various distributed >and persistent collectors. Maybe an old set is available somehow? > >-- >Patrick Logan mailto:patrickl@gemstone.com >Voice 503-533-3365 Fax 503-629-8556 >Gemstone Systems, Inc http://www.gemstone.com >

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Re: garbage collection in a distributed environment
by Ian Piumarta 22 Jun '98

22 Jun '98

> A while back, the Modula-3 effort built a system called Network objects that There are serious problems with NO. Check out this instead: http://www-sor.inria.fr/projects/sspc/ We have implementations in Lisp, C++ (the one on the web site is stale and should not be used), Java, Objective CAML, most of an implementation in Smalltalk, and the beginnings of one in the Join Calculus language. The basic mechanisms have been proved correct, and we recently added an extension to cut (and hence collect) distributed cycles of garbage. Ian PS: the above is actually my "day job". ;)

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arrow keys in browser
by David Stes 21 Jun '98

21 Jun '98

I think the up-down arrow (cursor) keys should work in the browser (so that you can use the arrow keys to scroll through methods and classes). Maybe I haven't been paying attention, but it seems this is not the case, at least not in 1.31 (which is what I'm still using). Ideally the left-right arrow keys should also work (more difficult - has anyone does this ?). I just added some code to deal with the up-down arrow keys which does the job for me (I'm not a MVC guru, but it seems to work).

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(Long; limited interest) For some of those behind firewalls and proxies
by Tom Morgan 21 Jun '98

21 Jun '98

Below is a file in, for those who live behind firewalls with HTTP proxies that require authentication. An example is the Netscape Fasttrack proxy. This is a pretty egregious hack, but it is good enough to allow you to use the 'update from network' facility to get your image current. To use: -In a workspace, evaluate (changing proxy name, port, user and password as required. You can find these values in the Preferences/Options for your browser): HTTPSocket useProxyServerNamed: 'proxy.yourcompany.com' port: 8080. HTTPSocket proxyUser: 'yourid' password: 'yourpassword'. -Update your image, or do other network functions. -If you have any interest in security at all, evaluate: HTTPSocket clearProxyUserPassword. when you are done. ...Tom M -- +---Tom Morgan ------------------------------ (tmorgan(a)acm.org) -----+ I Brooklyn Union Phone: 1 718 403 2427 I I 1 MetroTech Center Fax: 1 718 488 1752 I +---Brooklyn, New York 11201 USA ------------------------------------+ 'From Squeak 2.0 of May 22, 1998 on 21 June 1998 at 10:44:01 am'! "Change Set: HTTP Date: 21 June 1998 Author: Tom Morgan Additions and change to allow use of the HTTPSocket class for people who live behind firewalls which demand credentials. These changes were tested with the Netscape-FastTrack/2.01 proxy"! SimpleClientSocket subclass: #HTTPSocket instanceVariableNames: 'headerTokens ' classVariableNames: 'HTTPBlabEmail HTTPPort HTTPProxy HTTPProxyCredentials ParamDelimiters ' poolDictionaries: '' category: 'System-Network'! !HTTPSocket class methodsFor: 'class initialization' stamp: 'TEM 6/21/1998 09:55'! initialize "HTTPSocket initialize" ParamDelimiters _ ' ', CrLf. HTTPPort _ 80. HTTPProxy _ nil. HTTPBlabEmail _ ''. " 'From: tedk(a)disney.com', CrLf " HTTPProxyCredentials _ ''. ! ! !HTTPSocket class methodsFor: 'examples' stamp: 'TEM 6/21/1998 10:17'! httpGet: url accept: mimeType "Return the exact contents of a web object. Asks for the given MIME type. If mimeType is nil, use 'text/html'. The parsed header is saved. Use a proxy server if one has been registered. tk 7/23/97 17:12" "Note: To fetch raw data, you can use the MIMI type 'application/octet-stream'." | serverName serverAddr s header length bare page list firstData aStream newURL | Socket initializeNetwork. bare _ (url asLowercase beginsWith: 'http://') ifTrue: [url copyFrom: 8 to: url size] ifFalse: [url]. "For now, may not put :80 or other port number in a url. Use setHTTPPort:" serverName _ bare copyUpTo: $/. page _ bare copyFrom: serverName size + 1 to: bare size. page size = 0 ifTrue: [page _ '/']. HTTPProxy ifNotNil: [ page _ 'http://', serverName, page. "put back together" serverName _ HTTPProxy]. self retry: [serverAddr _ NetNameResolver addressForName: serverName timeout: 20. serverAddr ~~ nil] asking: 'Trouble resolving server name. Keep trying?' ifGiveUp: [Socket deadServer: serverName. ^ 'Could not resolve the server named: ', serverName]. s _ HTTPSocket new. s connectTo: serverAddr port: HTTPPort. "80 is normal" (s waitForConnectionUntil: (self deadlineSecs: 30)) ifFalse: [ Socket deadServer: serverName. s destroy. ^ 'Server ',serverName,' is not responding']. Transcript cr; show: serverName; cr. s sendCommand: 'GET ', page, ' HTTP/1.0', CrLf, (mimeType ifNotNil: ['ACCEPT: ', mimeType, CrLf] ifNil: ['']), 'ACCEPT: text/html', CrLf, "Always accept plain text" HTTPProxyCredentials, CrLf, HTTPBlabEmail, "may be empty" 'User-Agent: Squeak 1.31', CrLf. "blank line" list _ s getResponseUpTo: CrLf, CrLf. "list = header, CrLf, CrLf, beginningOfData" header _ list at: 1. Transcript show: page; cr; show: header; cr. firstData _ list at: 3. "Find the length" length _ s contentsLength: header. "saves the headerTokens" length ifNil: [ (newURL _ s redirect) ifNotNil: [ s destroy. ^ self httpGet: newURL accept: mimeType]. Transcript cr; show: 'Some kind of Error'. s destroy. ^ header]. aStream _ s getRestOfBuffer: firstData totalLength: length. s destroy. "Always OK to destroy!!" ^ aStream "String with just the data"! ! !HTTPSocket class methodsFor: 'examples' stamp: 'TEM 6/21/1998 10:31'! proxyUserTestingComment "Set and clear proxy authentication credentials" " HTTPSocket clearProxyUserPassword. HTTPSocket useProxyServerNamed: 'proxy.yourdomain.com' port: 8080. HTTPSocket proxyUser: 'tmorgan' password: 'xxxxxxxx'" " HTTPSocket stopUsingProxyServer " ! ! !HTTPSocket class methodsFor: 'proxy settings' stamp: 'TEM 6/21/1998 09:57'! clearProxyUserPassword "Atonement for an ugly hack that stores your proxy password in your image. This clears the userid and password" HTTPProxyCredentials _ ''. ! ! !HTTPSocket class methodsFor: 'proxy settings' stamp: 'TEM 6/21/1998 10:23'! proxyUser: userName password: password "Store HTTP 1.0 basic authentication credentials Note: this is an ugly hack that stores your password in your image. It's just enought to get you going if you use a firewall that requires authentication" | ss bb | ss _ ReadWriteStream on: (String new: 16). ss nextPutAll: userName,':',password. bb _ Base64MimeConverter mimeEncode: ss. HTTPProxyCredentials _ 'Proxy-Authorization: Basic ', (bb contents). ! ! !HTTPSocket class methodsFor: 'proxy settings' stamp: 'TEM 6/21/1998 10:25'! stopUsingProxyServer "Stop directing HTTP request through a proxy server." self clearProxyUserPassword. HTTPProxy _ nil. HTTPPort _ 80. ! ! HTTPSocket initialize! 'From Squeak 2.0 of May 22, 1998 on 21 June 1998 at 10:44:01 am'! "Change Set: HTTP Date: 21 June 1998 Author: Tom Morgan Additions and change to allow use of the HTTPSocket class for people who live behind firewalls which demand credentials. These changes were tested with the Netscape-FastTrack/2.01 proxy"! SimpleClientSocket subclass: #HTTPSocket instanceVariableNames: 'headerTokens ' classVariableNames: 'HTTPBlabEmail HTTPPort HTTPProxy HTTPProxyCredentials ParamDelimiters ' poolDictionaries: '' category: 'System-Network'! !HTTPSocket class methodsFor: 'class initialization' stamp: 'TEM 6/21/1998 09:55'! initialize "HTTPSocket initialize" ParamDelimiters _ ' ', CrLf. HTTPPort _ 80. HTTPProxy _ nil. HTTPBlabEmail _ ''. " 'From: tedk(a)disney.com', CrLf " HTTPProxyCredentials _ ''. ! ! !HTTPSocket class methodsFor: 'examples' stamp: 'TEM 6/21/1998 10:17'! httpGet: url accept: mimeType "Return the exact contents of a web object. Asks for the given MIME type. If mimeType is nil, use 'text/html'. The parsed header is saved. Use a proxy server if one has been registered. tk 7/23/97 17:12" "Note: To fetch raw data, you can use the MIMI type 'application/octet-stream'." | serverName serverAddr s header length bare page list firstData aStream newURL | Socket initializeNetwork. bare _ (url asLowercase beginsWith: 'http://') ifTrue: [url copyFrom: 8 to: url size] ifFalse: [url]. "For now, may not put :80 or other port number in a url. Use setHTTPPort:" serverName _ bare copyUpTo: $/. page _ bare copyFrom: serverName size + 1 to: bare size. page size = 0 ifTrue: [page _ '/']. HTTPProxy ifNotNil: [ page _ 'http://', serverName, page. "put back together" serverName _ HTTPProxy]. self retry: [serverAddr _ NetNameResolver addressForName: serverName timeout: 20. serverAddr ~~ nil] asking: 'Trouble resolving server name. Keep trying?' ifGiveUp: [Socket deadServer: serverName. ^ 'Could not resolve the server named: ', serverName]. s _ HTTPSocket new. s connectTo: serverAddr port: HTTPPort. "80 is normal" (s waitForConnectionUntil: (self deadlineSecs: 30)) ifFalse: [ Socket deadServer: serverName. s destroy. ^ 'Server ',serverName,' is not responding']. Transcript cr; show: serverName; cr. s sendCommand: 'GET ', page, ' HTTP/1.0', CrLf, (mimeType ifNotNil: ['ACCEPT: ', mimeType, CrLf] ifNil: ['']), 'ACCEPT: text/html', CrLf, "Always accept plain text" HTTPProxyCredentials, CrLf, HTTPBlabEmail, "may be empty" 'User-Agent: Squeak 1.31', CrLf. "blank line" list _ s getResponseUpTo: CrLf, CrLf. "list = header, CrLf, CrLf, beginningOfData" header _ list at: 1. Transcript show: page; cr; show: header; cr. firstData _ list at: 3. "Find the length" length _ s contentsLength: header. "saves the headerTokens" length ifNil: [ (newURL _ s redirect) ifNotNil: [ s destroy. ^ self httpGet: newURL accept: mimeType]. Transcript cr; show: 'Some kind of Error'. s destroy. ^ header]. aStream _ s getRestOfBuffer: firstData totalLength: length. s destroy. "Always OK to destroy!!" ^ aStream "String with just the data"! ! !HTTPSocket class methodsFor: 'examples' stamp: 'TEM 6/21/1998 10:31'! proxyUserTestingComment "Set and clear proxy authentication credentials" " HTTPSocket clearProxyUserPassword. HTTPSocket useProxyServerNamed: 'proxy.yourdomain.com' port: 8080. HTTPSocket proxyUser: 'tmorgan' password: 'xxxxxxxx'" " HTTPSocket stopUsingProxyServer " ! ! !HTTPSocket class methodsFor: 'proxy settings' stamp: 'TEM 6/21/1998 09:57'! clearProxyUserPassword "Atonement for an ugly hack that stores your proxy password in your image. This clears the userid and password" HTTPProxyCredentials _ ''. ! ! !HTTPSocket class methodsFor: 'proxy settings' stamp: 'TEM 6/21/1998 10:23'! proxyUser: userName password: password "Store HTTP 1.0 basic authentication credentials Note: this is an ugly hack that stores your password in your image. It's just enought to get you going if you use a firewall that requires authentication" | ss bb | ss _ ReadWriteStream on: (String new: 16). ss nextPutAll: userName,':',password. bb _ Base64MimeConverter mimeEncode: ss. HTTPProxyCredentials _ 'Proxy-Authorization: Basic ', (bb contents). ! ! !HTTPSocket class methodsFor: 'proxy settings' stamp: 'TEM 6/21/1998 10:25'! stopUsingProxyServer "Stop directing HTTP request through a proxy server." self clearProxyUserPassword. HTTPProxy _ nil. HTTPPort _ 80. ! ! HTTPSocket initialize!

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Unicode characters & strings...
by David Anderson 20 Jun '98

20 Jun '98

Has anyone implemented Unicode characters/strings for squeak. Just curious... Dave Anderson deandrsn(a)uiuc.edu

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Serial port
by Leandro Caniglia 20 Jun '98

20 Jun '98

SerialPort|primOpenPort:... works fine, but SerialPort|primClosePort: always fails. So I can open the port, but I cannot close it. I'm using 2.0 and WinNT4.0. Does anybody have any idea of what is wrong? Thank you. Saludos, Leandro God save the Squeak

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Updates Listing?
by William Barnett-Lewis 19 Jun '98

19 Jun '98

Hello, Does there exist a single list with descriptions of all the updates that have been published via the automatic update? There is a list, in the update server directory, of all the names - obviously since that's needed to know if all the updates have been d/l'd. But is there a central list someplace with a short description like in Dan Ingalls' message yesterday? It isn't something important; I just find it helpful to my learning process and easier to understand what I'm doing with that kind of information available. Thanks, William William Barnett-Lewis wlewis(a)mailbag.com -- _______________________________________________ Live without fear; your Creator loves you as a mother. Go in peace to follow the good road and may God's blessing be with you always. St. Claire _______________________________________________

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What about persistent GC ?
by Markus Kohler 19 Jun '98

19 Jun '98

Hi, When we talk about distributed GC, another interesting question comes to my mind. That's how can persistent objects be garbage collected efficiently ? Im asking that because implementing a simple OODB for squeak might be an interesting project. Markus -- [This signature is intentionally left blank.]

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