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Re: Q: call_external hangs IDL Windows GUI? [message #43757 is a reply to message #43613]

Wed, 27 April 2005 09:09

b_gom
Messages: 105
Registered: April 2003

Senior Member

Josh,

not knowing exactly what you want to do, I'd suggest making a DLM with
one function that spawns a thread for computation, and another function
that polls to see if the thread is complete (by checking a global
variable for example). In IDL you'd either stay in a loop until the
polling function succeeds, or you'd set up a timer widget to
periodically check the thread status.

Brad

Joshua Lynch wrote:
> b_gom@hotmail.com wrote:
>> Joshua,
>>
>> call_external does block in Windows (there is no multi-threading in
the
>> IDL interpreter) You can, however, call an external function that
>> starts a thread and then returns quickly to IDL. You will have to
sort
>> out the messaging between the threads on your own though.
>>
>
> Any suggestions on how to make IDL wait until the thread is
completed?
> Is there a way to block on a variable (preferably not to busy wait)
in
> IDL and have the C code modify it? Or should I just go RTFM? :-)
>
> Thanks again.
>
>
> --josh

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[Message index]

		Q: call_external hangs IDL Windows GUI? By: Joshua Lynch on Wed, 20 April 2005 11:31
		Re: Q: call_external hangs IDL Windows GUI? By: Rick Towler on Fri, 22 April 2005 14:35
		Re: Q: call_external hangs IDL Windows GUI? By: b_gom on Wed, 27 April 2005 09:09

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