Hi Josh,
The spec is outdated.
"at (p) async" is preferred to "async at (p)".
In the first case, p is evaluated synchronously (i.e., by the parent
async) and then a single remote async is spawned.
In the second, p is semantically required to be evaluated asynchronously
with the parent async as it is contained in the body of an async.
Therefore, if the compiler cannot prove that "async at (p)" can be safely
rewritten into "at (p) async", a first local async is spawned to evaluate
p then change places as you describe.
Olivier
From: Josh Milthorpe <josh.miltho...@anu.edu.au>
To: x10-users@lists.sourceforge.net,
Date: 11/26/2012 11:07 PM
Subject: [X10-users] remote async idiom
Hi all,
section 13.3.3 of the language specification states
"In most cases, async at(p) S is preferred to at(p) async S, since the
former returns instantly, but the latter blocks waiting for the remote
activity to be spawned."
Is this correct? It is my understanding that, where p can be evaluated
statically, "at(p) async" is preferred as it will be translated into a
single asynchronous message to the remote place, whereas "async at(p)"
will create an activity at the current place which then changes places.
Many thanks,
Josh
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