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.