Re: [platform-swt-dev] AsyncExec() problem ?

[Steve Northover <Steve_Northover@xxxxxxxxxx>]

It's not a bug.  The runnable is
queued in for the user interface to execute.  If you do a "while
(true) ..." in the runnable, then the user interface will be stuck
endlessly running your loop, regarless of whether the runnable was async'd
or sync'd.  The key here is that async and sync exec do not create
a thread.

BTW:  Investigate Display.timerExec()
instead of forking a thread that periodically executes code in the user
interface thread.

"Sylvain Becker" <sybecker@xxxxxxxx> Sent by: platform-swt-dev-admin@xxxxxxxxxxx 10/30/2003 06:28 PM Please respond to platform-swt-dev

To:        <platform-swt-dev@xxxxxxxxxxx>         cc:                 Subject:        [platform-swt-dev] AsyncExec() problem ?

Hi all,

I post here because I have some problems using the asyncExec() function
of
the Display Class. And even after looking for many example, I think there
could be a problem with the function it self.

documentation says:

"Causes the run() method of the runnable to be invoked by the user-interface
thread at the next reasonable opportunity. The caller of this method
continues to run in parallel, and is not notified when the runnable has
completed."


but if I use something like this. the thread is called but is always on
the
Top, so the GUI is updated, but never get the focus!!  the problem
is
"caller of this method continues to run in parallel". in fact
AsyncExec
seems to works like the "syncExec" function.

//set a thread to update the gui.
display.asyncExec( new Runnable() {
                
                 public
void run() {
                
                 
               
while(true) {
                  
                 
               
                 System.out.println("aa");
                
                 
               
                 //here,
stuff to update the gui.
                
                 
               
}
                
                 }
});


thanks you for your help,


--
Sylvain Becker

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