Re: Making a package safe for use by multiple tasks

[dennison@telepath.com (Ted Dennison)]

"Alexander Boucke" <alexb@lufmech.rwth-aachen.de> wrote in message news:<adq0le$2np$1@nets3.rz.RWTH-Aachen.DE>...
> I am just playing with the idea to use multiple tasks in a programm doing
> linear algebra. The problem lies in my vector-algebra package, that uses
> some global tmp-object to optimize memory use and reuse. To give you the
...
> since I do reference counting on the vectors. The thing with the tmp_vec
> enables me to reuse this vector several times, e.g. in d := a + b + c it is
> not necessary to allocate it new every time, I could just overwrite tmp_vec
> here.

Forgive me for a bit of ignorance, but how exactly is this quicker
than making tmp_vec a local variable inside of "+" (which would be
perfectly task safe)? Also, how are you saving enough speed with
either method to make up for the vector copy that happens at the
return statement? Also, complicated operations like your "a + b + c"
construction may even have to allocate memory from the heap to store
the intermediate results. If you are truly that worried about speed,
shouldn't you be using procedures with "in out" parameters instead of
functions?

-- 
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