Hello,
I’m looking for a way to “safely” stop iterating over an event in
the TSelector class and store the result (histograms, trees, etc.).
TSelector Class Reference: v626/classTSelector.html:
Bool_t TSelector::Process(Long64_t entry):
… Processing stops when this function returns kFALSE.
But in the description of TSelector::Process() function:
The return value is currently not used.
It’s okay, let’s look further.
… The processing can be stopped by calling Abort()
and in the description of Abort() function:
… After abort the SlaveTerminate() and Terminate() are always called.
In practice, both of these functions, SlaveTerminate() and Terminate(), are not called.
If I look at the code of the function TTreePlayer::Process(),
then it is found there:
process = (selector->GetAbort() != TSelector::kAbortProcess &&
(selector->Version() != 0 || selector->GetStatus() != -1)) ? kTRUE : kFALSE;
Long64_t res = (process) ? 0 : -1;
if (process) {
selector->SlaveTerminate(); //<==call user termination function
selector->Terminate(); //<==call user termination function
res = selector->GetStatus();
}
Therefore if I abort process with kAbortProcess flag the terminated
functions are ignored.
As a consequence, when I stop the event loop with the Abort()
function, I have to call the (Slave)Terminate() functions explicitly.
This is fine, but it should be properly documented.
I don’t know if this behavior is buggy or if it’s a bug in the
documentation. The question is, what is the right thing to do in this
case: report an error in the TSelector class or an error in its documentation?
And where is the right place to report bugs in the documentation?
Yury.
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