[xsl] Questions about the `saxon:threads` extension attribute

Subject: [xsl] Questions about the `saxon:threads` extension attribute
From: "Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 27 Dec 2019 05:18:31 -0000
The questions below are essentially for Dr. Kay, though anyone interested
and able to shed light on these is welcome.

I need this information, because it seems not to be available in the Saxon

*General setup*:  We have multi-threaded processing specified by

*Q1*. What will happen if *thread1* calls the *fn:error*() function? Will
the execution of *thread2* be terminated immediately/promptly, or will it
continue executing until the end of its processing?

*Q2*. Same as Q1 above, but the multi-threaded processing is enclosed in
<xsl:try> and the error thrown by the *fn:error()* function is caught in
the `<xsl:catch>` child of `<xsl:try>`. Then `<xsl:catch>` produces a
normal value (the error is not re-thrown) b will the 2nd thread be
suppressed or will it continue executing until the end of its processing?

*Q3*.  This time there is no error thrown. Can we access the result of just
one of the threads (whichever finishes first) even before the other thread
has finished? For example, if the results of the two threads are in the
sequence constructor of an `<xsl:variable
select=bvmultithreadingResultsb>`, is it possible to access the result of
the first finished thread in an expression like:

fn:unordered($vmultithreadingResults)[1] ?

Dimitre Novatchev
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