[Prev][Next][Index][Thread]

Re: Passing parameters to threads



Roman Budzianowski wrote:
[...]
> > > On Thu, 13 Apr 2000, Dustin Voss wrote:
> > > > What is the best practice to pass a parameter to a thread?  The thread
> > > > function passed to make(<thread>) looks like it takes no parameters.
[...]
> It may simpler to just define a thread variable like:
> define thread variable *thread-state* = #f;
> 
> and then use the with-dynamic-binding macro (I hope I got the name right):
> with-dynamic-binding(*thread-state* = get-my-state())
> ...
> 
> end;

 I may not understand exactly what you are trying to achieve, but
I do not see why this would be simpler.

 Are you proposing the following ?
 make(<thread>,
      function: method () => ();
                  dynamic-bind(*thread-state* = get-my-state());
                    ...
                  end;
                end method);

 I fail to see what this adds to:
 make(<thread>,
      function: method () => ();
                  let my-state = get-my-state();
                  ...
                end method);

 And the initial problem was to get the some state to the thread,
so get-my-state() is the non-trivial function here.

 If you are proposing something else, make sure your solution
complies with Hugh's warning about thread-local bindings.
*thread-state* will be #f at the start of the new thread,
and so cannot be relied upon to pass any value to the
new thread, even if captured in a closure.

 Regards - Eric

--
Eric Gouriou                             eric_gouriou@pobox.com
References: