Thanx Dave for the reply and I couldn't comprehend what Vijay meant.
Regards
Suyash
From: "Vijay Saraswat" <vi...@saraswat.org>
To: "Mailing list for users of the X10 programming language"
<x10-users@lists.sourceforge.net>
Sent: Tuesday, December 10, 2013 5:16:45 PM
Subject: Re: [X10-users] Regarding X10 runtime
Dave -- Should Suyash be working with X10 head, or 2.4?
On 12/10/13 6:36 AM, David P Grove wrote:
suy...@cse.iitm.ac.in wrote on 12/10/2013 05:25:13 AM:
>
> I am trying to work with X10 runtime and wish to perform some
> modifications in it. I am working with x10-2.3.0 runtime (for quite
> some time now). For the below query I had set X10_NTHREADS=8. The
> program and its input was kept constant for multiple runs. The queryfollows:
>
> 1) The await() method present in class SimpleLatch -- x10.runtime/
> src-x10/x10/util/concurrent/SimpleLatch.x10 -- has a comment
> (written above it) as "can only be called once". Does this mean that
> "await()" method can only be called once per a "worker" or is there
> something which I am missing. (I observed await() being called more
> than once).
>
Hi,
The comment means that await can only be called once on each instance of a
SimpleLatch. Each SimpleLatch object is intended to be used to block 1 Worker
exactly once and then discarded.
If await is being called multiple times on the same SimpleLatch object, then
the results are probably not going to be good (depending on the state of the
SimpleLatch either the Worker calling await a second time is not going to wait
at all (state is already set to true because the previous synchronization on
the SimpleLatch has already completed) or a Worker may get lost (first
synchronization is still in progress, Worker A is parked and a reference stored
in worker field; Worker B erroneously calls await on the same SimpleLatch
object overwriting the worker field with a pointer to itself)).
--dave
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