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Fix thread-safety problems with CSC simhit fitting in validation #35528

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Merged
cmsbuild merged 2 commits into from
Oct 5, 2021
Merged

Fix thread-safety problems with CSC simhit fitting in validation #35528

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a579064
Fix thread-safety problems with simhit fitting
Oct 3, 2021
35bcf43
Suggestion by Chris Jones
Oct 4, 2021
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1 change: 1 addition & 0 deletions Validation/MuonHits/BuildFile.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
<use name="SimDataFormats/Vertex"/>
<use name="root"/>
<use name="clhep"/>
<use name="rootminuit"/>
<export>
<lib name="1"/>
</export>
7 changes: 6 additions & 1 deletion Validation/MuonHits/src/CSCSimHitMatcher.cc
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
#include "Validation/MuonHits/interface/CSCSimHitMatcher.h"
#include "TGraphErrors.h"
#include "TF1.h"
#include "TMinuitMinimizer.h"

using namespace std;

Expand All @@ -13,6 +14,10 @@ CSCSimHitMatcher::CSCSimHitMatcher(const edm::ParameterSet& ps, edm::ConsumesCol

simHitInput_ = iC.consumes<edm::PSimHitContainer>(simHitPSet_.getParameter<edm::InputTag>("inputTag"));
geomToken_ = iC.esConsumes<CSCGeometry, MuonGeometryRecord>();

//In order to make fitting ROOT histograms thread safe
// one must call this undocumented function
TMinuitMinimizer::UseStaticMinuit(false);
}

/// initialize the event
Expand Down Expand Up @@ -237,7 +242,7 @@ void CSCSimHitMatcher::fitHitsInChamber(unsigned int detid, float& intercept, fl

std::unique_ptr<TGraphErrors> gr(new TGraphErrors(x.size(), &x[0], &y[0], &xe[0], &ye[0]));
std::unique_ptr<TF1> fit(new TF1("fit", "pol1", -3, 4));
gr->Fit("fit", "EMQ");
gr->Fit("fit", "EMQN");

intercept = fit->GetParameter(0);
slope = fit->GetParameter(1);
Expand Down