From: Warren Young
Date: December 15 2004 12:35am
Subject: Re: glibc detected double free or corruption
List-Archive: http://lists.mysql.com/plusplus/3809
Message-Id: <41BF86C2.9050201@etr-usa.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit

Fabio.DAndria@stripped wrote:
> Result CDatabase::ReturnQuery(string query)

It would be more efficient to pass the string as a const reference.  As 
it is, you are copying the string object when calling this function, 
which isn't necessary.

>                 //executes a query and returns a resultset back
>                 Query myQuery = myConn.query();
>                 myQuery.reset();

You only have to reset the query object when trying to reuse it.  A 
newly-created query object is alredy reset.

>                 //executes the query
>                 Result myResult = myQuery.store();
>                 return myResult;

Again, an unnecessary copy here.  Just say "return myQuery.store();"

>         catch (BadQuery er)

Another unnecessary copy.  You can almost always catch exceptions by 
reference.

As for the rest of your code, please reduce it to a simpler example. 
I'm not going to work my way through your threading code just to get to 
the MySQL++ issue underneath, if any.