Hi,
on page 17 of the language description it reads as follows. "Yet programs
using clocks are guaranteed not to suffer from deadlock."
It seems that I can preset a program that contradicts this statement. I have
attached the program to this post. Admittedly, this is a mixture of finish,
async and clocks, and there are remarks in the language definition about
restrictions in using this combination. But I found these remarks confusing
and would wish for a better explanation.
Anyway, my current X10DT and C++ backend let me get away with this program. So
I could compile without errors and run on two MPI tasks and end up in what
appears to be a plain deadlock. The output is as follows.
<map>
<host name="sirius" slots="1" max_slots="0">
<process rank="0"/>
<process rank="1"/>
</host>
</map>
<stdout rank="0">main: before ClockTest</stdout>
<stdout rank="1">Before next</stdout>
<stdout rank="0">Before next</stdout>
[...hang...]
Is this a feature or a bug ? If the latter, do you want me to file a report in
JIRA ? Thanks !
--
Mit freundlichen Grüßen / Kind regards
Dr. Christoph Pospiech
High Performance & Parallel Computing
Phone: +49-351 86269826
Mobile: +49-171-765 5871
E-Mail: christoph.pospi...@de.ibm.com
-------------------------------------
IBM Deutschland GmbH
Vorsitzender des Aufsichtsrats: Erich Clementi
Geschäftsführung: Martin Jetter (Vorsitzender),
Reinhard Reschke, Christoph Grandpierre,
Klaus Lintelmann, Michael Diemer, Martina Koederitz
Sitz der Gesellschaft: Ehningen / Registergericht: Amtsgericht Stuttgart, HRB
14562 WEEE-Reg.-Nr. DE 99369940
public class Hello {
def ClockTest() {
val c = Clock.make();
finish for (p in Place.places ) {
async (p) clocked (c) {
Console.OUT.println("Before next");
next;
Console.OUT.println("After next");
}
}
}
public static def main(var args: Rail[String]!) {
Console.OUT.println("main: before ClockTest");
var h:Hello! = new Hello();
h.ClockTest();
Console.OUT.println("main: after ClockTest");
}
}------------------------------------------------------------------------------
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