maria-developers team mailing list archive

[Oleksandr Byelkin <sanja@xxxxxxxxxxxx>]

Hi!

9 февр. 2010, в 15:45, Michael Widenius написал(а):
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> > +      my_atomic_rwlock_wrlock(&soft_sync_rwl);
> > +      my_atomic_store32(&soft_sync_min, fileno);
> > +      my_atomic_store32(&soft_sync_max, fileno);
> > +      my_atomic_rwlock_wrunlock(&soft_sync_rwl);
>
> Don't understand why my_atomic_rwlock_wrlock is enough protection  
> here.
> Why use my_atomic_store32 ?

As I understood idea of atomic operation it is guaranted that we will  
read consistent value (not one byte from one value and other one from  
other). Yes I remember your statement that on modern 32bit system you  
always get it consistent, then why we made atomic operations at all?