FreeTDS Development Group

["Lowden, James K" <LowdenJK AT bernstein.com>]

> From: Frediano, VF-IT
> Sent: Thursday, June 30, 2005 4:13 AM
> 
> > I'm not a big fan of boolean return values.  Not getting what
> > you expected isn't always the same as failing.
> > 
> > Regards,
> > 
> 
> Actually we just tests if returned state if what we requested. In
> case of going to query TDS_QUERYING is an error or a success
> depending on original state. Considering thread problems and
> 
> if (tds->state != TDS_QUERYING) {
>   if (tds_set_state(tds, TDS_QUERYING) != TDS_QUERYING)
>     return TDS_FAIL;
> }
> 
> if this is not atomic thread1 can check tds->state != TDS_QUERYING
> while thread2 change same thing so each tds_set_state return
> TDS_QUERYING even if tds_set_state is atomic.

OK, I understand, and you're right.  Go ahead.  

Threads, bah.  I hate threads.  First we invent protected memory, devise
languages based on exclusive access to it, and use IPC to communicate
between processes.  Then we throw all that away and share the memory
among multiple independent paths of execution.  Suddenly:

1       if A != B
2               A = B
3       endif 
        
means A could be C on line 4.  I might as well work in FORTH.  

--jkl


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