Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Fri, 28 Jan 2011 17:13:31 -0600

Hi Till,

On Thursday 27 January 2011 19:52:47 Till Straumann wrote:
> registrySetTableSize() can only be called before the hash table
> is lazy-initialized but that apparently happens from some C++
> global constructor already so that the application gets it's shot
> too late (i.e., even the first line of 'main()' is too late).
>
> (Since the registry is used for registering function names for
> iocsh etc. it is impossible to set the table size from a startup
> script anyways.)

I agree, registrySetTableSize() can't even be used on vxWorks since the static 
C++ constructor that registers some basic iocsh commands gets run as we load 
the binary, so it's currently useless.

> PS: An alternate 'general-purpose' hash implementation using
> the linear-hashing algorithm could be explored. This would avoid
> having to set static table sizes.

Code contributions are welcome.  I think Jeff already has various hash table 
templates that are similar to linear hashing (see resourceLib.h) but they 
present a C++ API.

- Andrew
-- 
If a man is offered a fact which goes against his instincts, he will
scrutinize it closely, and unless the evidence is overwhelming, he will
refuse to believe it.  If, on the other hand, he is offered something
which affords a reason for acting in accordance to his instincts, he
will accept it even on the slightest evidence.  -- Bertrand Russell

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System