Re: [Gomp-discuss] Decision about semaphores ..

[Lars Segerlund]

 Yes I have looked at it :-) .

 I have a downloaded copy of it also, it's very good.

 / Lars.

Steven Bosscher wrote:
> Op wo 19-02-2003, om 12:24 schreef Lars Segerlund:
>
> >  I have looked at libc's semaphores, but it's explicitly stated that 
> > they are not SMP safe ! ( even a bit unsure about how they would work 
> > with native linux threads ).
> >
> >  You use a semaphore for a join in the following fashion, every thread 
> > which is started increases the value of the semaphore ( starts an 0 ), 
> > when theyre finished they atomically decrease it, and the thread which 
> > sets it to null uses a signal to signal the join. ( also works for 
> > barriers and synchronisation ).
> >
> >  Threads which have decreased the semaphore waits on the signal, and 
> > the main thread can do the same.
> >
> >  I was thinking of using a condition ( cond ) in the threading lib, 
> > which is easy to wait on ( not busy, so sleep on would be more 
> > appropriate ).
> >
> > / Lars Segerlund.
>
>
> Have you looked at: http://www.advancedlinuxprogramming.com/ ?
>
> IIRC they discuss lots of threaded programming issues.  The book is
> free.
>
> Greetz
> Steven
>
>
>
>
>
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