<div>Sorry, i've sent an unfinished mail ...</div><div>Second try :</div><div><br></div><div>The problem : synchronizing an instance of a class gameEngine which starts instances of classes which implement transition screen / game levels.</div>
<div>Pseudo-level code : </div><div><br></div><div>Game engine</div>- start introscreen<div>- wait semaphore</div><div>-start level 1</div><div>- wait semaphore</div><div>- start level 2</div><div>-wait semaphore</div><div>
- start finished screen </div><div><br></div><div>See example of code in Squeak with semaphore in my previous mails.</div><div>I wonder why the code is freezing.</div><div><br></div><div>Thanks for any help.</div><div><br>
</div><div>Patrick Dudjalija</div><div><br></div><div><br></div><div><br></div><div><div class="gmail_quote">2012/8/15 patrick dudjalija <span dir="ltr"><<a href="mailto:patrick.dudjalija@gmail.com" target="_blank">patrick.dudjalija@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello Chris ! <div><br></div><div>Thank you for the link. Free books of Stephane Ducasse are inderdeed a *MUST*.</div><div>
<a href="http://stephane.ducasse.free.fr/FreeBooks.html" target="_blank">http://stephane.ducasse.free.fr/FreeBooks.html</a></div>
<div>(BTW, everybody should consider a little donation to support him)</div><div><br></div><div>I'm realizing that my question is unclear.</div><div>Let me have a new try in pseudocode.</div><div><br></div><div>The problem : synchronizing an instance of a class gameEngine which starts instances of transition screen / game levels.</div>
<div><br></div><div>Game engine</div><div> </div><div><br></div><div><br></div><div><br></div><div><br><div class="gmail_quote">2012/8/15 <span dir="ltr"><<a href="mailto:beginners-request@lists.squeakfoundation.org" target="_blank">beginners-request@lists.squeakfoundation.org</a>></span><br>
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Today's Topics:<br>
<br>
1. Simple semaphore to synchronize instances of different<br>
classes (patrick dudjalija)<br>
2. Re: Simple semaphore to synchronize instances of different<br>
classes (Chris Cunnington)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Tue, 14 Aug 2012 21:24:06 +0200<br>
From: patrick dudjalija <<a href="mailto:patrick.dudjalija@gmail.com" target="_blank">patrick.dudjalija@gmail.com</a>><br>
Subject: [Newbies] Simple semaphore to synchronize instances of<br>
different classes<br>
To: beginners <<a href="mailto:beginners@lists.squeakfoundation.org" target="_blank">beginners@lists.squeakfoundation.org</a>><br>
Message-ID:<br>
<CAEMqm6GttreSY5i+SA=Hg1=<a href="mailto:C8sAszQOu63miV_R5cfAW5a77Sw@mail.gmail.com" target="_blank">C8sAszQOu63miV_R5cfAW5a77Sw@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="iso-8859-1"<div><div class="h5"><br>
<br>
Hi everybody !<br>
<br>
I'm developing an educative game.<br>
I've written a "gameEngine" class which does the logic for the general<br>
progression in the game : switching between instances of morph<br>
subclasses which implement intro screen / mini-games/levels / end<br>
screen etc ...<br>
<br>
Now, i need to synchronize the instance of the gameEngine class with<br>
the instances of the other classes.<br>
Example : once the gameEngine starts the instance of a morph subclass<br>
which implements a mini-game, it must sleep until the mini-game is<br>
finished, and then wake up and does further required switching (next<br>
mini-game or intro screen or end screen ...).<br>
<br>
i thought that a "simple" semaphore would quickly give a solution to<br>
the problem.<br>
But i get a freezed code.<br>
<br>
I've modelized/simplified the problem with the following workspace code.<br>
See also fileout of Class TestSynchro as attachment.<br>
TestSynchro has a step method which prints some lines to Transcript,<br>
then calls the method stopStepping and signal to the semaphore.<br>
The workspace code does a wait, before printing to Transcript 'Hello World'!<br>
<br>
Problem is that the code freezes , on the line code -> sem wait<br>
I first thought that the code freezed because in the same process. And<br>
added a fork to the block which creates instance of TestSynchro. But<br>
it does'nt help ...<br>
<br>
Any help will be appreciated !<br>
Thanks by advance,<br>
<br>
Patrick Dudjalija<br>
<br>
<br>
<br>
|ts sem|<br>
<br>
sem:=Semaphore new.<br>
<br>
[ts:= TestSynchro new.<br>
ts semaphore:sem.<br>
ts openInWorld.<br>
ts start.] fork.<br>
<br>
sem wait.<br>
Transcript cr; show:'Hello world !';cr.<br></div></div>
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------------------------------<br>
<br>
Message: 2<br>
Date: Tue, 14 Aug 2012 16:07:36 -0400<br>
From: Chris Cunnington <<a href="mailto:smalltalktelevision@gmail.com" target="_blank">smalltalktelevision@gmail.com</a>><br>
Subject: Re: [Newbies] Simple semaphore to synchronize instances of<br>
different classes<br>
To: <a href="mailto:beginners@lists.squeakfoundation.org" target="_blank">beginners@lists.squeakfoundation.org</a><br>
Message-ID: <<a href="mailto:502AB008.3030104@gmail.com" target="_blank">502AB008.3030104@gmail.com</a>><br>
Content-Type: text/plain; charset="iso-8859-1"<div><div class="h5"><br>
<br>
On 12-08-14 3:24 PM, patrick dudjalija wrote:<br>
> Hi everybody !<br>
><br>
> I'm developing an educative game.<br>
> I've written a "gameEngine" class which does the logic for the general<br>
> progression in the game : switching between instances of morph<br>
> subclasses which implement intro screen / mini-games/levels / end<br>
> screen etc ...<br>
><br>
> Now, i need to synchronize the instance of the gameEngine class with<br>
> the instances of the other classes.<br>
> Example : once the gameEngine starts the instance of a morph subclass<br>
> which implements a mini-game, it must sleep until the mini-game is<br>
> finished, and then wake up and does further required switching (next<br>
> mini-game or intro screen or end screen ...).<br>
><br>
> i thought that a "simple" semaphore would quickly give a solution to<br>
> the problem.<br>
> But i get a freezed code.<br>
><br>
> I've modelized/simplified the problem with the following workspace code.<br>
> See also fileout of Class TestSynchro as attachment.<br>
> TestSynchro has a step method which prints some lines to Transcript,<br>
> then calls the method stopStepping and signal to the semaphore.<br>
> The workspace code does a wait, before printing to Transcript 'Hello World'!<br>
><br>
> Problem is that the code freezes , on the line code -> sem wait<br>
> I first thought that the code freezed because in the same process. And<br>
> added a fork to the block which creates instance of TestSynchro. But<br>
> it does'nt help ...<br>
><br>
> Any help will be appreciated !<br></div></div>
> Thanks by ad2vance,<div class="im"><br>
><br>
> Patrick Dudjalija<br>
><br>
><br>
><br>
> |ts sem|<br>
><br>
> sem:=Semaphore new.<br>
><br>
> [ts:= TestSynchro new.<br>
> ts semaphore:sem.<br>
> ts openInWorld.<br>
> ts start.] fork.<br>
><br>
> sem wait.<br>
> Transcript cr; show:'Hello world !';cr.<br>
><br>
><br></div>
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<br>
I don't know much about this stuff, but using Semaphore for animations<br>
seems too low level. Pg. 53 of this pdf describes how step and stepTime<br>
work.<br>
<br>
HTH,<br>
Chris<br>
<br>
<br>
<br>
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