On Wed, Feb 27, 2019 at 10:07 AM Scott, Barry <[email protected]>
wrote:
>
> The code I have posted is the good version so it works and the assert
> does not fire. My goal is to show what I assume is the correct way to code
> a function that uses internal Deferred(), not give an example that breaks.
>
> This should cause the the assert as the code must wait for the thread to
> return a result.
>
> def doWork():
> d = Deferred()
> d2 = deferToThread(doWorkHelper)
> d.callback(d2)
> return d
>
Ah. I see. Indeed, this code is wrong and triggers the assert. For what
it's worth, there is a simpler solution than the example you gave. It uses
the "chainDeferred" method:
def doWork():
d = Deferred()
d2 = deferToThread(doWorkHelper)
d2.chainDeferred(d)
return d
Jean-Paul
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