Re: [ROOT] Pbms reseting histograms

From: Rene Brun (Rene.Brun@cern.ch)
Date: Thu Aug 09 2001 - 12:43:43 MEST


Hi Primrose,

Primrose Mbanefo wrote:
> 
> Hello everyone,
>         I have a program which uses the consummer and producer example in the
> tutorial but how can the consummer reset the histograms in shared memory? If
> the consumer resets the histogram the producer suffers a segmentation fault.
> 

Only the producer should write into the shared memory.


> Is it possible for the consummer to send a signal to the producer via the
> shared memory so that the producer can send a reset histogram instead of the
> original histogram or do I need to create another shared memory for the
> signal to go through.
> 
> or is there another way of attacking the problem?
> 

You must implement a dialog mechanism. I suggest you look at hclient.C/hserv.C
for an example.

Rene Brun



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