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diff --git a/History.md b/History.md
--- a/History.md
+++ b/History.md
@@ -11,6 +11,9 @@
===
## R02-0X-00
+1 Aug 2024 Fernando Abudinen
+* D127: Improve FSR mutexing by using `std::lock_guard`.
+
3 July 2024 Fernando Abudinen
* D126: Fix FSR initialisation for thread safety.
- Modified PHOTOS and Sherpa instances to become global static members
diff --git a/src/EvtGenExternal/EvtPHOTOS.cpp b/src/EvtGenExternal/EvtPHOTOS.cpp
--- a/src/EvtGenExternal/EvtPHOTOS.cpp
+++ b/src/EvtGenExternal/EvtPHOTOS.cpp
@@ -50,7 +50,7 @@
void EvtPHOTOS::initialise()
{
- m_photos_mutex.lock();
+ const std::lock_guard<std::mutex> lock( m_photos_mutex );
m_gammaId = EvtPDL::getId( m_photonType );
if ( m_gammaId == EvtId( -1, -1 ) ) {
@@ -62,7 +62,6 @@
m_gammaPDG = EvtPDL::getStdHep( m_gammaId );
if ( m_initialised ) {
- m_photos_mutex.unlock();
return;
}
@@ -100,8 +99,6 @@
#endif
m_initialised = true;
-
- m_photos_mutex.unlock();
}
void EvtPHOTOS::doRadCorr( EvtParticle* theParticle )
@@ -153,20 +150,19 @@
}
}
- m_photos_mutex.lock();
-
- /* Now pass the event to Photos for processing
+ {
+ const std::lock_guard<std::mutex> lock( m_photos_mutex );
+ /* Now pass the event to Photos for processing
* Create a Photos event object */
#ifdef EVTGEN_HEPMC3
- Photospp::PhotosHepMC3Event photosEvent( theEvent.get() );
+ Photospp::PhotosHepMC3Event photosEvent( theEvent.get() );
#else
- Photospp::PhotosHepMCEvent photosEvent( theEvent.get() );
+ Photospp::PhotosHepMCEvent photosEvent( theEvent.get() );
#endif
- // Run the Photos algorithm
- photosEvent.process();
-
- m_photos_mutex.unlock();
+ // Run the Photos algorithm
+ photosEvent.process();
+ }
// Find the number of (outgoing) photons in the event
const int nPhotons = this->getNumberOfPhotons( theVertex );
diff --git a/src/EvtGenExternal/EvtSherpaPhotons.cpp b/src/EvtGenExternal/EvtSherpaPhotons.cpp
--- a/src/EvtGenExternal/EvtSherpaPhotons.cpp
+++ b/src/EvtGenExternal/EvtSherpaPhotons.cpp
@@ -54,13 +54,13 @@
void EvtSherpaPhotons::initialise()
{
- m_sherpa_mutex.lock();
+ // Sherpa initialisation is not thread safe, so we mutex it
+ const std::lock_guard<std::mutex> lock( m_sherpa_mutex );
m_gammaId = EvtPDL::getId( m_photonType );
m_gammaPDG = EvtPDL::getStdHep( m_gammaId );
if ( m_initialised ) {
- m_sherpa_mutex.unlock();
return;
}
@@ -127,8 +127,6 @@
this->updateParticleLists();
m_initialised = true;
-
- m_sherpa_mutex.unlock();
}
std::vector<char*> EvtSherpaPhotons::addParameters()
@@ -257,17 +255,18 @@
blob->AddToOutParticles( daughter_part );
}
- m_sherpa_mutex.lock();
-
- const SHERPA::Initialization_Handler* inithandler =
- m_sherpaGen->GetInitHandler();
- SHERPA::Soft_Photon_Handler* softphotonhandler =
- inithandler->GetSoftPhotonHandler();
+ {
+ // AddRadiation function is not yet thread_safe, so we mutex it
+ const std::lock_guard<std::mutex> lock( m_sherpa_mutex );
- // Simulate the radiation
- softphotonhandler->AddRadiation( blob.get() );
+ const SHERPA::Initialization_Handler* inithandler =
+ m_sherpaGen->GetInitHandler();
+ SHERPA::Soft_Photon_Handler* softphotonhandler =
+ inithandler->GetSoftPhotonHandler();
- m_sherpa_mutex.unlock();
+ // Simulate the radiation
+ softphotonhandler->AddRadiation( blob.get() );
+ }
// Get number of final-state particles
const int nFinal( blob->NOutP() );

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