[news.eclipse.platform.swt] Re: Thread,SWT,ASYN,SYN problem

["Joe Smith" <ohcho@xxxxxxxxxx>]

"Horváth, Csaba" <hcs33@xxxxxxxxxxxxxxxx> wrote in message 
news:d8bsun$ose$1@xxxxxxxxxxxxxxxxxxx
> Hi,
>
> Both syncExec and asyncExec can be used to do something in the 'user
> interface thread'. The main difference between them is explained in the
> javadoc: the syncExec method causes your thread to wait for the specified
> Runnable to finish but asyncExec is not: it returns immediately after it
> 'registers' the Runnable into the ui thread.

In addition to this, generally you do not need asyncExec().
Unless you have specific need to use it, in most situation,
you will need "syncExec()".

Regards.


>
> Example:
> 1. The specified Runnable (A) may or (most likely) may not be executed at
> the time "A" is printed to the screen.
> Display.asyncExec(A);
> System.out.println("A");
>
> 2. The specified Runnable (A) is guaranteed to finish its work at the time
> "A" is printed.
> Display.syncExec(A);
> System.out.println("A");
>
> Note that - because the user interface thread is a single thread - it can
> execute only one specified Runnable at a time. So your case is a normal
> behaviour: first A is executed and then B either method you use.
>
> HTH,
> Regards,
> Csaba
>
> binjava wrote:
>> hi everybody...
>>
>> who can tell me about difference of ASynExec and SynExec?
>>
>>
>> i create two threads by display.synexec
>>
>> synexec(A)
>> synexec(B)
>>
>> but B thread start still when A thread is finish.....
>> why?
>>
>> A and B is ProgressBar....same...result..
>>
>> i try asynexec.....
>> help...
>
>