Steve,
I'm remailing this because it didn't show up in my U-group list:
On Monday 19 May 2014 17:01:35 Steve Wampler wrote:
> On 05/19/2014 01:58 AM, user wrote:
> > I seem to have bumped into a vicious circle with threads.
> >
> > I want to "parallelize" a generator procedure producing a VARYING number
> > of results every call, in a sequence that is NOT important.
> >
> >>From the docs I understand that the usual method would be:
> >
> > every [(GEN) do] put(L1,thread put(L2,gen()))
>
> You're putting a sequence of threads into L1, where each thread is putting
> results from gen() into L2.
Yes, exactly ONE result for each thread (total number of threads, and
therefore results, varies each time this "every [(GEN)]..." line gets
executed).
> So L2 is the sequence of results you're
> interested in?
That's right!
> I assume you're going to do a 'every wait(!L1)' to wait
> for all the results to get loaded into L2, right?
Right!
>
> What are the symptoms you're seeing? Did you make L2 thread-safe?
Oops! How do I do that?
>
> > with GEN preferably generating the exact number of (varying) iterations
> > as any call of gen() would produce in results.
>
> I have trouble understanding this. Can you give a short, concrete,
> example?
#----------------------------------------------------
procedure main()
T:=[];R:=[]
every (1 to 10) do put(T,thread put(R,gen())) #CONSTANT no.of results!
#every ( put(T,thread put(R,gen()))) #SINGLE !
write("Number of Threads: ",*T)
write("Number of Results: ",*R)
n:=0
every wait(!T) do write("Thread no.",n +:=1,"\nResult is ",R[n])
write("Threads finished!")
end
#----------------------------------------------------
procedure gen()
delay(2000) ### to check (with top e.g.) if multi-threading does occur!
suspend (1 to 10) #CONSTANT no.of results, contrary to my actual code!
end
#----------------------------------------------------
>
> > The obvious solution would be to lose the "(GEN) do" but then only ONE
> > THREAD GETS CREATED !
>
> Yep - that's expected.
Can you explain please?
Thanks again.
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