[webkit-dev] fastMallloc

Mark Rowe mrowe at apple.com
Thu Jul 24 13:06:01 PDT 2008

On Jul 24, 2008, at 7:32 AM, Balázs Kelemen wrote:

> Hi Webkit developers!
> I would ask you about the use of the tcmalloc system. I believed  
> that it is the default malloc system under Webkit. But when I  
> browsed the code, I had realized that if the USE_SYTEM_MALLOC  
> directive is set, operator new and operator delete doesn't  
> overridden by fastMalloc and fastFree, and that case fastMalloc and  
> fastFree calls malloc and free. It is the standard malloc and free?  
> Moreover I can't find any definition of this functions in the case  
> when USE_SYSTEM_MALLOC isn' set. In my system -I work with the Qt  
> port on Linux in the team of University Szegediensis- the Makefiles  
> contain -DUSE_SYSTEM_MALLOC in release and debug builds too.

If USE_SYTEM_MALLOC is defined then, as its name suggests, the system  
malloc implementation will be used.  I believe that the Qt port always  
uses the system allocator as there is no portable method of  
restricting the scope of global operator new to a single library, and  
they did not wish WebKit's custom allocator to interfere with Qt  
client applications.

- Mark

More information about the webkit-dev mailing list