Re: [Java-player-users] Problems with laserinterface

[kevinl <liu...@gm...>]

Hi Skuld,
Thanks very much.^_^
I get it. So the thread will keep calling the read() until yield() or
sleep().

Yours sincerely,
kevin.


Skuld wrote:
> 
> ^^
> 
> Sure I can.
> As I told you in my first reply, you have to call the Read method to fill
> up your structure's fields,
> from a communication pipe with Player.
> 
> That is the code of the JavaClient (2.0.1 version, but all versions should
> work the same.) 
> 
>     public void runThreaded (long millis, int nanos) {
>         if (isThreaded) {
>             System.err.println ("[PlayerClient]: A second call for
> runThreaded, ignoring!");
>             return;
>         }
> 	    this.millis = millis;
> 	    this.nanos  = nanos;
> 	    isThreaded  = true;
> 	    this.start ();
> 	}
> 
> As you can see, when you call RunThreaded, you just set some special
> fields before
> launching the start method. I guess you know how works Threads in java, so
> I'll just show you
> the run method (which is called by the start method):
> 
>     public void run () {
>         try {
>             while (isThreaded) {
>             	if (this.datamode == PLAYER_DATAMODE_PULL) {
>         			this.requestData ();
>                 	while (read () != PLAYER_MSGTYPE_SYNCH && isThreaded);
>             	} else
> //            		while (is.available () != 0)
> //                	while (read () != PLAYER_MSGTYPE_SYNCH && isThreaded);
>             		read ();
>             	
>                 if (millis < 0)
>                     Thread.yield ();
>                 else
>                     if (nanos <= 0)
>                         Thread.sleep (millis);
>                     else
>                         Thread.sleep (millis, nanos);
>             }
>         } catch (InterruptedException e) { throw new PlayerException (e);
> }
> //    	} catch (IOException e) { throw new PlayerException (e); }
>     }
> 
> Do you understand? This function have a while's loop. This loop first wait
> for data from Player,
> and dispatch it in the structures's fields with a read() 's loop. There is
> the call of the Read function.
> (an equivalent to be meticulous, because Read function is available in C
> library, but in Java,
> read is a private function. You just can call it by readAll(), which does
> the same things that the C one does,
> and the simple read does too -but with verifications.)
> 
> So, in fact when you call RunThreaded, one Thread is specially created to
> catch information from
> Player and dispatch it into structures, for the other Thread (because
> threads share memory.), so for your code,
> so you doesn't have to call Read() anymore. And you still have
> informations from Player.
> 
> Here it is !
> I hope I was clear enough ^^ If I wasn't, tell me so.
> Have a nice day!
> Skuld
> 
> 
> kevinl wrote:
>> 
>> Hi Skuld,
>> Thank you for your advice, I call runThreaded(-1,-1) before my code and I
>> can get the data now. And I'm sorry to reply your message so late.  And I
>> am confused why the fuction of runThreaded(-1,-1) will call an equivalent
>> of Read. Could you tell me why?
>> 
>> Thanks a lot,
>> kevin
>> 
>> 
> 
> 

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