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Scalable distributed sequential lock version 1.11

Ramine

12/7/2014 6:46:00 PM


Hello,


I have updated my scalable distributed sequential lock to version 1.11,
i have just corrected a bug, because before my algorithm was doing this
on the writer side:

In the WLock() it was doing this:

If Fcount5^.fcount5=0 then fcount4^.fcount4:=Fcount4^.fcount4+1;

And in the WUnlock() it was doing this:

If Fcount5^.fcount5=0 then fcount4^.fcount4:=Fcount4^.fcount4+1;


This has introduced a bug cause if we are just before
that "FCount6^.fcount6 mod nbrcores" equal to 0 and
the RLock() enters the reader section without
calling the dw.RLock() and the writer side enters
in a distributed mode and enters the writer section
so they will both succeed to enter and the Runlock()
will return true and this is a bug , to correct this bug
we must delete the "If Fcount5^.fcount5=0" if the
"count4^.fcount4:=Fcount4^.fcount4+1" like this:

In the WLock() it was doing this:

fcount4^.fcount4:=Fcount4^.fcount4+1;


And in the WUnlock() it was doing this:

fcount4^.fcount4:=Fcount4^.fcount4+1;


Now i think my algorithm is correct.


You can download the updated version 1.01 from:

https://sites.google.com/site/aminer68/scalable-distributed-seque...



Thank you,
Amine Moulay Ramdane.