Write all tracks to a single file

src/simulation.cpp

@@ -82,6 +82,11 @@ int openmc_simulation_init()
   // Allocate source, fission and surface source banks.
   allocate_banks();
 
+  // Create track file if needed
+  if (!settings::track_identifiers.empty() || settings::write_all_tracks) {
+    open_track_file();
+  }
+
   // If doing an event-based simulation, intialize the particle buffer
   // and event queues
   if (settings::event_based) {
@@ -152,6 +157,11 @@ int openmc_simulation_finalize()
     mat->mat_nuclide_index_.clear();
   }
 
+  // Close track file if open
+  if (!settings::track_identifiers.empty() || settings::write_all_tracks) {
+    close_track_file();
+  }
+
   // Increment total number of generations
   simulation::total_gen += simulation::current_batch * settings::gen_per_batch;