[saga-rg] wait on tasks...

[Andre Merzky]

Quoting [Tom Goodale] (Aug 25 2005):
> 
> On Wed, 17 Aug 2005, Andre Merzky wrote:
> 
>> Hi all,
>> 
>> the wait currently throws a NotRunning exception if the tast
>> is not running anymore.  That basically mean that _every_
>> wait has to be put into a try/catch, since the programmer
>> does not know in advance if the task is still active.
> 
> The can do a getState on the task.

You have a race condition then:

state = task.getState ();

# task finishes now

if ( state == Running )
{
  task.wait (-1.0); # throws an NotRunning exception
}

So that does not help.



>> We would like to propose to change that behaviour, and just
>> return immediately on wait, even if it is called multiple
>> times.  A NotRunning exception should only be thrown if the
>> task was cancelled before.
> 
> or if the task has not been run.  Basically we need an exception in any 
> case that the wait can return but the output arguments of the task are 
> invalid.

Right.  That would be a good policy.


>> The same should hold for the TaskContainer.
> 
> Yep.
> 
> Tom


Cheers, Andre.



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