Groups > comp.soft-sys.math.mathematica > #1672

CheckAbort inside MathLink functions?

From	Alexey <lehin.p@gmail.com>
Newsgroups	comp.soft-sys.math.mathematica
Subject	CheckAbort inside MathLink functions?
Date	2011-04-14 08:58 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<io6cus$do8$1@smc.vnet.net> (permalink)

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Hello,

It seems that that such MathLink functions as LinkWrite and LinkRead have
something like its own internal CheckAbort that absorbs user-generated
aborts, and does not propagate them further.

This can be easily shown with LinkRead:

link = LinkLaunch[First[$CommandLine] <> " -mathlink"];
LinkRead[link];
LinkWrite[link, Unevaluated[Pause[100]]];
CheckAbort[AbortProtect[Print[LinkRead[link]]], Print["!!"]]

If we press Alt+. after evaluating the above code we get only the following
output:

During evaluation of In[6]:= ReturnPacket[$Aborted]

But Print["!!"] is not evaluated although we have generated Abort[] exactly
inside CheckAbort.

One can see that the abort we made by pressing Alt+. was absorbed by LinkRead.

My problem is that it breaks my own flow control of evaluation based on
CheckAbort.

Is there a way to intercept aborts absorbed by such functions as LinkRead
and LinkWrite for having ability to catch user-generated aborts?

Alexey

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CheckAbort inside MathLink functions? Alexey <lehin.p@gmail.com> - 2011-04-14 08:58 +0000

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