ROOT Version: 6.12
Platform: Centos 7
Compiler: gcc 6.2.0
Dear all,
I’m writing a small code quite similar to the tutorial example - tutorials/hserv.C hserv2.C hclient.C. Instead of sending a histogram, the target data is a vector of double derived from TObject:
Class Data : public TObject {
public:
...
const vector<double>& getData() const {return this->values;}
private:
vector<double> values;
};
On the sender side:
vector<double> list(100, 99.);
TServerSocket *ss = new TServerSocket(9090, kTRUE);
TSocket *socket = ss->Accept();
Data *sdata = new Data(move(list));
TMessage mess(kMESS_OBJECT);
mess.WriteObject(sdata);
socket->Send(mess);
And on the receiver side:
TSocket *socket = new TSocket("localhost",9090);
TMessage *mess;
socket->Recv(mess);
Data *cdata = (Data *) mess->ReadObject(mess->GetClass());
cdata->getData();
During runtime, the receiver side crashed with a segmentation violation:
Error in <TMessage::ReadClass>: illegal class tag=816318468 (0<tag<=1), I/O buffer corrupted
Error in <TMessage::ReadClass>: illegal class tag=816318468 (0<tag<=1), I/O buffer corrupted
*** Break *** segmentation violation
===========================================================
There was a crash.
This is the entire stack trace of all threads:
===========================================================
#0 0x00007f282385adbc in waitpid () from /lib64/libc.so.6
#1 0x00007f28237ddcc2 in do_system () from /lib64/libc.so.6
#2 0x00007f2827b55568 in TUnixSystem::StackTrace() () from /cvmfs/atlas.cern.ch/repo/ATLASLocalRootBase/x86_64/root/6.12.06-x86_64-slc6-gcc62-opt/lib/libCore.so
#3 0x00007f2827b57a6c in TUnixSystem::DispatchSignals(ESignals) () from /cvmfs/atlas.cern.ch/repo/ATLASLocalRootBase/x86_64/root/6.12.06-x86_64-slc6-gcc62-opt/lib/libCore.so
#4 <signal handler called>
#5 0x00000000004011dc in Data::getData() ()
#6 0x0000000000401044 in main ()
===========================================================
It seems the user object Data is not acceptable to TMessage, but all code examples I could find is to transfer histograms but no user defined objects. Should the data be derived from some specific class or it’s completely other issue?
Thanks in advance.