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From: "aminer" <aminer@videotron.ca>
Newsgroups: comp.programming.threads,comp.programming
Subject: Re: My threadpool engine and scalability...
Date: Mon, 1 Oct 2012 12:06:49 -0500
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After adding getindex() and execute1() methods , this threadpool
engine can also be used as a scalable queue (not a strict FIFO queue,
but it's also useful),
.

Amine Moulay Ramdane






"aminer" <aminer@videotron.ca> wrote in message 
news:k4ce5t$cv8$5@dont-email.me...
>
> Hello,
>
> If you take a look at my threadpool engine:
>
> http://pages.videotron.com/aminer/
>
> you will notice that it does not scale in the execute() method
> cause LockedIncLong(balance1) is expensive.
>
> here is the execute method:
>
> ==
>
> function TThreadPool.execute(func:TMyProc;const Context: Pointer): 
> Boolean;
>
> var
> local_balance,local_count:long;
>
> params:  PParams;
> p:pointer;
>
> begin
> new(params);
> setlength(params^,1);
> params^[0].proc:=func;
> params^[0].data:=context;
>
> local_balance:=LockedIncLong(balance1) mod FThreadCount;
> while not Queues[local_balance].push(tobject(params))  do sleep(0);
> events[local_balance].setevent;
> end;
>
> ===
>
> Now to be able to scale the execute() method we have to add a getindex()
> method like this
>
> function TThreadPool.getindex(var index:long);
> begin
> if  index <> 0
> then
>  begin
>   inc(index);
>    index:=index mod FThreadCount;
> end;
> end;
>
>
> and  also  add an execute1() method that scales perfectly like this:
>
> ==
> function TThreadPool.execute1(func:TMyProc;const Context:
> Pointer;index:long): Boolean;
>
> var
> local_balance,local_count:long;
>
> params:  PParams;
> p:pointer;
>
> begin
> new(params);
> setlength(params^,1);
> params^[0].proc:=func;
> params^[0].data:=context;
>
> while not Queues[index].push(tobject(params))  do sleep(0);
> events[local_balance].setevent;
> end;
>
> ==
>
> so we have to call the getindex() method from mutiple threads like this:
>
> // we have to initialize count to zero before:
>
> getindex(count)
> ThreadPool.execute(myproc,data,count)
>
> and now the execute1() method will scale perfectly.
>
>
> I will try update my threadpol engine soon.
>
>
>
> Thank you,
> Amine Moulay Ramdane.
>
>
>
>
>
>
>
>
>
>