Re: Advice Required - for avoiding conflict betwen qmail-smtpd, rblsmtpd loaded as shared objects in tcpserver

On 2 April 2017 at 10:34, Jens Bauer <[email protected]> wrote:
> Hi Manvendra.
>
> On Sun, 2 Apr 2017 10:18:31 +0530, Manvendra Bhangui wrote:
>> No I do not have any data. It is definitely not a bottleneck. It's
>> just that the idea of loading the control files just once does look
>> good. The right thing to do is load it only once, if it can be done
>> without compromising the integrity of tcpserver.
>
> I agree on this and I like the idea (especially because I once ran out of open files in Apache, since I had a log file for each web-site it served).
>
> Question: Do you read the data into read-only memory and then share a pointer (when read-only memory is available, that is) ?
>

I have written a wrapper named open_control_once() to open any control
file. This function sets up a flag to indicate that a control file has
been opened. If it is called multiple times, it just returns without
doing anything. The data however is not in read-only memory (constmap
and stralloc structures). But I do prevent a control file from being
opened multiple times.