Re: [Caml-list] Why systhreads?

[Sven Luther <luther@dpt-info.u-strasbg.fr>]

On Tue, Nov 26, 2002 at 10:34:01AM +0100, Xavier Leroy wrote:
> > In the case i have a multi-threaded lablgtk executable, having ine
> > thread managing the interface and the other running programs, that even
> > if i had a way of killing a thread (or setting a mutex or whatever to
> > signal it to stop), that if the running thread is looping, i will never
> > be able to execute the interface thread which will (trough a callback)
> > set the mutex to the stop option, because the running thread doesn't do
> > blocking IO ?
> 
> That's a long question.  Had to read it three times to see what you mean :-)

Yes, sorry about that.

> The answer to your question is that Caml systhreads do support
> preemption: a timer forces the currently running thread to call
> Thread.yield() at regular intervals.  In turn, Thread.yield()
> releases the master mutex, calls sched_yield(), and re-acquires the
> master mutex, giving other threads a chance to grab the master mutex
> and run.

So it is not necessary to call Thread.yield() myself before the blocking
code, right ?

> > keeping the GUI alive even if some other stuff is taking time or looping
> > forever is a nice application of threading support.
> 
> Sure.  But this is all taken care of.  

:)))

Friendly,

Sven Luther
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