DelegateSystem for ISRs and scheduling
Posted: Tue Mar 05, 2013 9:50 am
Hi all!
I've just got finished designing my delegate system, that I've been planning on using for ISRs and scheduling.
As I'm writing my kernel in C++11, I've decided to go for a full blown implementation using variadic templates, and I'm actually quite pleased with the result, one can use it alike this;
Which will result in the text; "C-3PO" being printed (obviously this works with any number of arguments, and any types, no type information is lost in the progress, and no casts are being performed).
And if for some reason one doesn't like the tuples, one can get rid of them using a little wrapper, using a simple tuple_concat and the unwind the tuple, this involves a wrapper of course.
Now to the question;
I'm currently using it in my scheduling (in my createThread(Runnable*) function), and I was going to use it in my ISR system too (to handle interrupts), however it has now come to my mind that maybe I should use my delegate system less, due to it's memory usage, and the overhead of the virtual function call.
The function delegate uses memory as stated below;
So will the overhead in memory and speed end up giving me trouble, or can I just go use my system wherever I feel like it, without concern?
//Skeen
I've just got finished designing my delegate system, that I've been planning on using for ISRs and scheduling.
As I'm writing my kernel in C++11, I've decided to go for a full blown implementation using variadic templates, and I'm actually quite pleased with the result, one can use it alike this;
Code: Select all
// ct = Creation Time, rt = Run Time
void function(Tuple<char,int> ct_args, Tuple<const char*> rt_args)
{
printf("%c%d%s", get<0>(ct_args), get<1>(ct_args), get<0>(rt_args));
}
Runnable<const char*>* callable1 = makeRunnable(function, 'C', -3);
callable1->invoke("PO");
And if for some reason one doesn't like the tuples, one can get rid of them using a little wrapper, using a simple tuple_concat and the unwind the tuple, this involves a wrapper of course.
Now to the question;
I'm currently using it in my scheduling (in my createThread(Runnable*) function), and I was going to use it in my ISR system too (to handle interrupts), however it has now come to my mind that maybe I should use my delegate system less, due to it's memory usage, and the overhead of the virtual function call.
The function delegate uses memory as stated below;
- * 0-1 u32int (or 0-4 u8int) arguments = 12 bytes
* 2 u32int (or 5-8 u8int) arguments = 16 bytes
So will the overhead in memory and speed end up giving me trouble, or can I just go use my system wherever I feel like it, without concern?
//Skeen
- I knew the fact, that it was expensive, but didn't know that, it was that expensive. wow!
