Network server and its CLient

ROOT
1

Hello rooters

I’d like run a network servers and clients.
see files in attachment

In a root server session i’d like to run this lines

.L ServerRoot.C++
TH1S* histo1= new TH1S(“Histo1”,“histo1”,10,0,10);
TH1S* histo2= new TH1S(“Histo2”,"histo2 ",10,0,10);
for (int i = 0;i<10;i++){histo1 ->Fill(i,i);histo2 ->Fill(i,10-i);}

ServerRoot* serv1 = new ServerRoot();
serv1->SetPort(9090);
ServerRoot* serv2 = new ServerRoot();
serv1->SetPort(9091);

serv1 ->StartGNetServer();
serv2 ->StartGNetServer();

serv1 ->SetSpectra(histo1);
serv2 ->SetSpectra(histo2);

In other root client session i 'd like run

.L ClientRoot.C++

ClientRoot* client1 =new ClientRoot(“localhost”);
client1->SetPort(9090);
ClientRoot* client2 =new ClientRoot(“localhost”);
client1->SetPort(9091);

client1->TestServer();
client2->TestServer();

TH1* histo1= client1->GetSpectrum();
TH1* histo2= client1->GetSpectrum();

histo1 -> Draw();
histo2 -> Draw();

So, sometime it’s ok
sometime client is hang and server is with 100% cpu consumption
and sometime client or client crash

why theses different behaviours?

Thank for your help.

Luc
ClientRoot.C (4.91 KB)
ServerRoot.C (5.76 KB)

2

Hello

Is there anybody has tested my exemple??

Luc

3

Fons will process your problem

rene

4

Hi,

after looking at the ServerRoot.C is looks like you don’t need the read thread as you could do it all with just a single TMonitor (see example $ROOTSYS/tutorials/net/hserv.C). And if you want to use a reader thread you won’t need a TMonitor, just do socket->Recv(). I think the random behaviour is due to the fact that TMonitor is not thread save and that you have tow threads calling it without mutex.

Cheers, Fons.

5

Thanks to have seen my problem

Excuse-me to not understand
"TMonitor is not thread save"
and if this is a problem, how to correct it?

Second point ,you said "two threads calling it without mutex."
Have you some where a example using , thread, mutex and TServerSocket?

Thanks for your help
Luc

6

Hi Luc,

just look at hserv.C, I think you can make you code without thread, but just a TMonitor (which is a select) on the multiple sockets. If you want a thread you won’t need a TMonitor, just call sock->Recv() and wait till you get something.

Cheers, Fons.

7

You don’t need Tmonitor even you have multiple clients??

Luc

8

not if you have one thread per client.

Cheers, Fons.