[saga-rg] wait on tasks...

[Tom Goodale]

On Thu, 25 Aug 2005, Andre Merzky wrote:

> 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.

Good point, but it does if we also change the exception, although they 
still might want to put a try around it to catch someone cancelling the 
task in the meantime;  on the other hand since that could only happen from 
within the same program, it's probably something the programmer can decide 
if they need to do.

Tom