[XviD-devel] hey I'm back :)

[Skal]

	Hi Radek! :)

On Mon, 2005-11-21 at 11:38, Radek Czyz wrote:
> Hey,
> 
> Michael Militzer wrote:
> > Also, Skal is working on multithreaded code and has made a lot (good and
> > bad) experiences with this recently. So you should check how your ideas
> > here overlap (or not) just to make sure you don't do things twice...
> 
> Bah, there goes my fun/learning ;)
> 
> I mostly want to know *how* to write such code, so even if things 
> repeat, it's not a huge loss.
> 
> Skal: what have you done? ^_^

	Ok, you take me by surprise, but anyway i'll just
	post here the helpers for MT i was preparing for
	XviD. It's mainly 2 files (slave.h and slave.c)
	that belongs to the /utils/ directory. They are
	not in a 'committable' state, but i think you
	can play with them. The API for using a 'slave'
	thread is rather simple:

ThreadWorker slave;
xvThreadInit(&slave);	// creates a sleeping thread, hereby called 'slave'

	// prepare a workload to give the to the slave when times come
ThreadWorkerData work;
work._Call = myParallelFunc;
work._Int1 = some param to be passed ...

          // schedule the parallel task
xvThreadSetTodo(&slave, &work);

   // do something else while the slave is working...
 ...

   // sync everybody
xvThreadSync(&slave);

   // finish
xvThreadEnd(&slave);



   Now the func to be executed in parallel look something like:

void *myParallelFunc(ThreadWorkerData *data)
{
   int myParam = data->_Int1;
   // etc...

   /// do something

   return 0;  // success. Return something !=0 to abort MT.
}



	Well, i think it's close to useful, notwithstanding
	the bugs of course! Haf phun!

	bye,
Skal


(for the experiments i made, it'll take another (somewhat longer;) mail)