object sync monitor ref
Pavel
phondogo at gmail.com
Thu Nov 7 02:35:11 PST 2013
Hello!
For every object of class there is two pointers (for vtable and
monitor).
I wonder why there is a need to have sync functionality in object
(1 pointer memory waste).
There is also such overhead in Java and during my work with it I
use synchronized section only for about 0.01% of all objects in
program (may be even less). So 99.99% of objects just waste
memory for that monitor pointer.
Why don't to introduce some annotation (property) for class
needed to be synchronized or it descendants, according to it
compiler will extend the size of class by the size of monitor
structure (+1 allocation less).
Synchronization will be allowed when class or supers is annotated
with this property (it can be checked by compiler).
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