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.
If you evaluate something in a workspace, it will be executed by the UI
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 <[email protected]>
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 <[email protected]>
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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)
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Message: 1
Date: Tue, 14 Aug 2012 21:24:06 +0200
From: patrick dudjalija <[email protected]>
Subject: [Newbies] Simple semaphore to synchronize instances of
different classes
To: beginners <[email protected]>
Message-ID:
<CAEMqm6GttreSY5i+SA=Hg1=c8saszqou63miv_r5cfaw5a7...@mail.gmail.com>
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.
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Message: 2
Date: Tue, 14 Aug 2012 16:07:36 -0400
From: Chris Cunnington <[email protected]>
Subject: Re: [Newbies] Simple semaphore to synchronize instances of
different classes
To: [email protected]
Message-ID: <[email protected]>
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
> [email protected]
> 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
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