[Kst] extragear/graphics/kst/src

[George Staikos]

SVN commit 521998 by staikos:

synchronize locking by pointer value


 M  +4 -4      libkst/rwlock.cpp  
 M  +3 -1      libkstapp/updatethread.cpp  
 M  +60 -28    libkstmath/kstdataobject.cpp