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// -*- C++ -*-
//
// Package: Framework
// Class: TestNThreadsChecker
//
/**\class TestNThreadsChecker TestNThreadsChecker.cc FWCore/Framework/test/stubs/TestNThreadsChecker.cc
Description: <one line class summary>
Implementation:
<Notes on implementation>
*/
//
// Original Author: Chris Jones
// Created: Thu Jan 03 11:02:00 EST 2013
//
//
// system include files
#include <memory>
#include <atomic>
#include <unistd.h>
#include "oneapi/tbb/task_arena.h"
// user include files
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/ServiceRegistry/interface/ActivityRegistry.h"
#include "FWCore/ServiceRegistry/interface/ServiceMaker.h"
#include "FWCore/ServiceRegistry/interface/SystemBounds.h"
#include "FWCore/Utilities/interface/Exception.h"
//
// class decleration
//
class TestNThreadsChecker {
public:
explicit TestNThreadsChecker(const edm::ParameterSet&, edm::ActivityRegistry&);
private:
// ----------member data ---------------------------
unsigned int m_nExpectedThreads;
};
//
// constants, enums and typedefs
//
//
// static data member definitions
//
//
// constructors and destructor
//
TestNThreadsChecker::TestNThreadsChecker(const edm::ParameterSet& iConfig, edm::ActivityRegistry& iReg)
: m_nExpectedThreads(iConfig.getUntrackedParameter<unsigned int>("nExpectedThreads")) {
unsigned int expectedThreads = m_nExpectedThreads;
if (expectedThreads == 0) {
expectedThreads = oneapi::tbb::this_task_arena::max_concurrency();
}
//now do what ever initialization is needed
iReg.watchPreallocate([expectedThreads](edm::service::SystemBounds const& iBounds) {
if (expectedThreads != iBounds.maxNumberOfThreads()) {
throw cms::Exception("UnexpectedNumberOfThreads")
<< "Expected " << expectedThreads << " threads but actual value is " << iBounds.maxNumberOfThreads();
}
});
}
//define this as a plug-in
DEFINE_FWK_SERVICE(TestNThreadsChecker);
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