Re: Re: [Newbies] Simple semaphore to synchronize instances of different classes
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Re: Re: [Newbies] Simple semaphore to synchronize instances of different classes
 
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Hello Chris !
Thank you for the link. Free books of Stephane Ducasse are inderdeed a *MUST*.
(BTW, everybody should consider a little donation to support him) I'm realizing that my question is unclear. Let me have a new try in pseudocode. The problem : synchronizing an instance of a class gameEngine which starts instances of transition screen / game levels.
Game engine 2012/8/15 <[hidden email]> Send Beginners mailing list submissions to _______________________________________________ Beginners mailing list [hidden email] http://lists.squeakfoundation.org/mailman/listinfo/beginners |
Re: Re: [Newbies] Simple semaphore to synchronize instances of different classes
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Sorry, i've sent an unfinished mail ... Second try : The problem : synchronizing an instance of a class gameEngine which starts instances of classes which implement transition screen / game levels.
Pseudo-level code : Game engine - start introscreen- wait semaphore -start level 1 - wait semaphore - start level 2 -wait semaphore
- start finished screen See example of code in Squeak with semaphore in my previous mails. I wonder why the code is freezing. Thanks for any help. Patrick Dudjalija 2012/8/15 patrick dudjalija <[hidden email]> Hello Chris ! _______________________________________________ Beginners mailing list [hidden email] http://lists.squeakfoundation.org/mailman/listinfo/beginners |
Re: Simple semaphore to synchronize instances of different classes
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On 12-08-15 3:12 PM, patrick dudjalija wrote:
> |ts sem| > > sem:=Semaphore new. > > [ts:= TestSynchro new. > ts semaphore:sem. > ts openInWorld. > ts start.] fork. > > sem wait. > Transcript cr; show:'Hello world !';cr. in a Workspace the tem vars are unnecessary. (ie. |ts sem|). The second thing is that if I execute the code down to "fork" it runs fine. A blue square appears in the corner and it counts steps one to nine in the Transcript. It's only when you add "sem wait" that it freezes. I had to use Command+. on my Mac to unfreeze it. And I'm not convinced this is a bug. Remember, I don't think there is a Morph anywhere that uses Semaphore in #step. I have a feeling this is not a bug and that it's doing exactly what it's supposed to. You have created a Morph and now you've stopped it with #wait. I bet that's locking up the entire World, so it appears to freeze. That's my guess. HTH, Chris _______________________________________________ Beginners mailing list [hidden email] http://lists.squeakfoundation.org/mailman/listinfo/beginners |
Re: Re: [Newbies] Simple semaphore to synchronize instances of different classes
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In reply to this post by patrick dudjalija
On Wed, 15 Aug 2012, patrick dudjalija wrote:
> Sorry, i've sent an unfinished mail ... > Second try : > > The problem : synchronizing an instance of a class gameEngine which starts instances of classes which implement transition screen / game levels. > Pseudo-level code : > > Game engine > - start introscreen- wait semaphore > -start level 1 > - wait semaphore > - start level 2 > -wait semaphore > - start finished screen > > See example of code in Squeak with semaphore in my previous mails. > I wonder why the code is freezing. process. If you wait for something, then the whole UI will stop responding while you're waiting. Btw, I don't think Semaphores are the thing you're looking for. Semaphores are for synchronizing processes, but AFAIK Morphic is a single process framework. Levente > > Thanks for any help. > > Patrick Dudjalija > > > > 2012/8/15 patrick dudjalija <[hidden email]> > Hello Chris ! > Thank you for the link. Free books of Stephane Ducasse are inderdeed a *MUST*. > http://stephane.ducasse.free.fr/FreeBooks.html > (BTW, everybody should consider a little donation to support him) > > I'm realizing that my question is unclear. > Let me have a new try in pseudocode. > > The problem : synchronizing an instance of a class gameEngine which starts instances of transition screen / game levels. > > Game engine > > > > > > 2012/8/15 <[hidden email]> > Send Beginners mailing list submissions to > [hidden email] > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.squeakfoundation.org/mailman/listinfo/beginners > or, via email, send a message with subject or body 'help' to > [hidden email] > > You can reach the person managing the list at > [hidden email] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Beginners digest..." > > > Today's Topics: > > 1. Simple semaphore to synchronize instances of different > classes (patrick dudjalija) > 2. Re: Simple semaphore to synchronize instances of different > classes (Chris Cunnington) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 14 Aug 2012 21:24:06 +0200 > From: patrick dudjalija <[hidden email]> > Subject: [Newbies] Simple semaphore to synchronize instances of > different classes > To: beginners <[hidden email]> > Message-ID: > <CAEMqm6GttreSY5i+SA=Hg1=[hidden email]> > Content-Type: text/plain; charset="iso-8859-1" > > Hi everybody ! > > I'm developing an educative game. > I've written a "gameEngine" class which does the logic for the general > progression in the game : switching between instances of morph > subclasses which implement intro screen / mini-games/levels / end > screen etc ... > > Now, i need to synchronize the instance of the gameEngine class with > the instances of the other classes. > Example : once the gameEngine starts the instance of a morph subclass > which implements a mini-game, it must sleep until the mini-game is > finished, and then wake up and does further required switching (next > mini-game or intro screen or end screen ...). > > i thought that a "simple" semaphore would quickly give a solution to > the problem. > But i get a freezed code. > > I've modelized/simplified the problem with the following workspace code. > See also fileout of Class TestSynchro as attachment. > TestSynchro has a step method which prints some lines to Transcript, > then calls the method stopStepping and signal to the semaphore. > The workspace code does a wait, before printing to Transcript 'Hello World'! > > Problem is that the code freezes , on the line code -> sem wait > I first thought that the code freezed because in the same process. And > added a fork to the block which creates instance of TestSynchro. But > it does'nt help ... > > Any help will be appreciated ! > Thanks by advance, > > Patrick Dudjalija > > > > |ts sem| > > sem:=Semaphore new. > > [ts:= TestSynchro new. > ts semaphore:sem. > ts openInWorld. > ts start.] fork. > > sem wait. > Transcript cr; show:'Hello world !';cr. > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: TestSynchro.st > Type: application/octet-stream > Size: 2201 bytes > Desc: not available > Url : http://lists.squeakfoundation.org/pipermail/beginners/attachments/20120814/8d30cdd2/TestSynchro-0001.obj > > ------------------------------ > > Message: 2 > Date: Tue, 14 Aug 2012 16:07:36 -0400 > From: Chris Cunnington <[hidden email]> > Subject: Re: [Newbies] Simple semaphore to synchronize instances of > different classes > To: [hidden email] > Message-ID: <[hidden email]> > Content-Type: text/plain; charset="iso-8859-1" > > On 12-08-14 3:24 PM, patrick dudjalija wrote: > > Hi everybody ! > > > > I'm developing an educative game. > > I've written a "gameEngine" class which does the logic for the general > > progression in the game : switching between instances of morph > > subclasses which implement intro screen / mini-games/levels / end > > screen etc ... > > > > Now, i need to synchronize the instance of the gameEngine class with > > the instances of the other classes. > > Example : once the gameEngine starts the instance of a morph subclass > > which implements a mini-game, it must sleep until the mini-game is > > finished, and then wake up and does further required switching (next > > mini-game or intro screen or end screen ...). > > > > i thought that a "simple" semaphore would quickly give a solution to > > the problem. > > But i get a freezed code. > > > > I've modelized/simplified the problem with the following workspace code. > > See also fileout of Class TestSynchro as attachment. > > TestSynchro has a step method which prints some lines to Transcript, > > then calls the method stopStepping and signal to the semaphore. > > The workspace code does a wait, before printing to Transcript 'Hello World'! > > > > Problem is that the code freezes , on the line code -> sem wait > > I first thought that the code freezed because in the same process. And > > added a fork to the block which creates instance of TestSynchro. But > > it does'nt help ... > > > > Any help will be appreciated ! > > Thanks by ad2vance, > > > > Patrick Dudjalija > > > > > > > > |ts sem| > > > > sem:=Semaphore new. > > > > [ts:= TestSynchro new. > > ts semaphore:sem. > > ts openInWorld. > > ts start.] fork. > > > > sem wait. > > Transcript cr; show:'Hello world !';cr. > > > > > > _______________________________________________ > > Beginners mailing list > > [hidden email] > > http://lists.squeakfoundation.org/mailman/listinfo/beginners > > http://stephane.ducasse.free.fr/FreeBooks/GuzdialBookDrafts/BuildUI-ch5.pdf > > I don't know much about this stuff, but using Semaphore for animations > seems too low level. Pg. 53 of this pdf describes how step and stepTime > work. > > HTH, > Chris > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: http://lists.squeakfoundation.org/pipermail/beginners/attachments/20120814/b2a5039f/attachment-0001.htm > > ------------------------------ > > _______________________________________________ > Beginners mailing list > [hidden email] > http://lists.squeakfoundation.org/mailman/listinfo/beginners > > > End of Beginners Digest, Vol 76, Issue 5 > **************************************** > > > > > Beginners mailing list [hidden email] http://lists.squeakfoundation.org/mailman/listinfo/beginners |
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In reply to this post by Chris Cunnington
On Wed, Aug 15, 2012 at 1:11 PM, Chris Cunnington
<[hidden email]> wrote: > On 12-08-15 3:12 PM, patrick dudjalija wrote: >> >> |ts sem| >> >> sem:=Semaphore new. >> >> [ts:= TestSynchro new. >> ts semaphore:sem. >> ts openInWorld. >> ts start.] fork. >> >> sem wait. >> Transcript cr; show:'Hello world !';cr. > > Well, I can observer a few things. The first is that running this code in a > Workspace the tem vars are unnecessary. (ie. |ts sem|). The second thing is > that if I execute the code down to "fork" it runs fine. A blue square > appears in the corner and it counts steps one to nine in the Transcript. > It's only when you add "sem wait" that it freezes. I had to use Command+. on > my Mac to unfreeze it. And I'm not convinced this is a bug. Remember, I > don't think there is a Morph anywhere that uses Semaphore in #step. I have a > feeling this is not a bug and that it's doing exactly what it's supposed to. > You have created a Morph and now you've stopped it with #wait. I bet that's > locking up the entire World, so it appears to freeze. That's my guess. > > HTH, > Chris So, if you'd still like to do it this way, if you place your entire script from the workspace into a [] fork, it should then work (since it will no longer block the UI process). _______________________________________________ Beginners mailing list [hidden email] http://lists.squeakfoundation.org/mailman/listinfo/beginners |
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