OpenEuphoria

Re: Multitasking Preview Release

• Posted by codepilot Gmail Account <codepilot at gmail.com> Sep 22, 2005
• 595 views

Get the new TDLL, and use t_func/proc it splits calls into other
threads so blocking calls turn into non-blocking.

Dan

On 9/22/05, Juergen Luethje <j.lue at gmx.de> wrote:
>
>
> Robert Craig wrote:
>
> > Jonas Temple wrote:
> >> Will this handle the following (in Windows):
> >>
> >> * Routine "a" is executed when a user clicks a button
> >> * "a" starts task "b"
> >> * task "b" calls a routine in a .DLL that extracts information from an=
other computer.
> >>  Sometimes the answer comes back quickly and sometimes the answer come=
s back in minutes
> >> (i.e. SQL query).  For this example, let's say 5 minutes.
> >> * user can't wait for answer and wants to cancel the query.  I add a b=
utton to the
> >> window that lets the user cancel the query.  User clicks button and I =
use task_kill()
> >> against task "b".
> >>
> >> Since task "b" is still waiting for the routine in the DLL to return, =
would taks "b"
> >> be cancelled immediately or when the DLL returns control to task "b"?
> >
> > With cooperative multitasking, task b can't call a routine in a .dll
> > and then wait inside that call, without holding up all the other tasks.
> >
> > What you need is some kind of asynchronous (non-blocking) I/O call,
> > that will let task b return from the call immediately, and then
> > check periodically to see if the I/O is complete. You could set up
> > task b to check, say, every 2 or 3 seconds to see if the I/O is complet=
e.
> > While it's doing that, other tasks could handle the user interface,
> > and any other processing that you want to do in parallel with task b.
> > If the user wants to stop the I/O, you could let task b know via
> > a global variable that it should quit, or you could call
> > task_kill() on task b to force it to stop the periodic checking.
>
> <snip>
>
> I wrote a plugin (a Windows DLL) for Total Commander. Sometimes, when
> the DLL reads/writes huge files, obviously Total Commander is not able
> to update the optical appearance of its main window, until the DLL has
> finished its work.
>
> Can I do something to solve the problem now, without the new
> multitasking system? Can the new multitasking system help to write
> "more cooperative" DLLs?
>
> TIA,
>   Juergen
>
> --
> Have you read a good program lately?
>
>
>
>