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Resolved Critical sections?

  1. How-to
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  1. Haakon Langballe
    Haakon Langballe
  2. PowerBuilder
  3. Monday, 23 March 2020 14:51 PM UTC

Hi all.

Working from home now. Hope the situation wil get back to normal soon!

In my project I foun a hand crafted critical section (below). It's in a timer callback, to prevent multiple callbacks from entering the funtion.

Is there a construct in Powerbuilder 19 that will do this out of the box? 

 

if not gUpdating then
gUpdating = true
of_get_stuff()
gUpdating = false
end if

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Responses (2)
Miguel Leeuwe
Miguel Leeuwe Accepted Answer Pending Moderation
  1. Monday, 23 March 2020 17:03 PM UTC
  2. PowerBuilder
  3. # 1

Hi,

You did not explain what gUpdating is, but I assume it's a global (boolean?) variable.

What you can do is a call to:

Timer(0)

right after entering the timer event.

When finished whatever is being done in the timer event, you re-activate the timer with "timer(xxx)", xxx being a non-zero value.

hope that might be what you're looking for.

regards,

Comment
Haakon Langballe
  1. Haakon Langballe
  2. Tuesday, 24 March 2020 08:05 AM UTC
Hi Miguel.

Yes it's a global boolean.

I think your Timer(0) suggestion may be a good solution.



Thanks

Haakon
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Miguel Leeuwe
  1. Miguel Leeuwe
  2. Tuesday, 24 March 2020 08:10 AM UTC
yes, just try it.
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Chris Pollach @Appeon
Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Monday, 23 March 2020 20:42 PM UTC
  2. PowerBuilder
  3. # 2

Hi Haakon;

   Unfortunately at this time, PB does not support "call backs". You can workaround this by creating your own C++ (or now C# DLL in PBN2019 R2) and have this "broker" the callback for you.

Regards ... Chris

Comment
Roland Smith
  1. Roland Smith
  2. Tuesday, 24 March 2020 02:19 AM UTC
I don't think he is talking about external function callback arguments.
  1. Helpful
Chris Pollach @Appeon
  1. Chris Pollach @Appeon
  2. Tuesday, 24 March 2020 14:46 PM UTC
Hi Roland ... Yes, the queston was not very clear. The use of the word "Callback" would infer a different use than handling multiple posts from a timer and/or shared object.
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