Fix a race condition in the enb csv metrics where set_handle was called while the metrics thread is running causing a race in the enb member variable.

Fix it by setting it during object construction.

srsenb/hdr/metrics_csv.h

@@ -32,11 +32,10 @@ namespace srsenb {
 class metrics_csv : public srsran::metrics_listener<enb_metrics_t>
 {
 public:
-  metrics_csv(std::string filename);
+  metrics_csv(std::string filename, enb_metrics_interface* enb_);
   ~metrics_csv();
 
   void set_metrics(const enb_metrics_t& m, const uint32_t period_usec);
-  void set_handle(enb_metrics_interface* enb_);
   void stop();
 
 private:

srsenb/src/main.cc

@@ -632,10 +632,9 @@ int main(int argc, char* argv[])
   metricshub.add_listener(&metrics_screen);
   metrics_screen.set_handle(enb.get());
 
-  srsenb::metrics_csv metrics_file(args.general.metrics_csv_filename);
+  srsenb::metrics_csv metrics_file(args.general.metrics_csv_filename, enb.get());
   if (args.general.metrics_csv_enable) {
     metricshub.add_listener(&metrics_file);
-    metrics_file.set_handle(enb.get());
   }
 
   srsenb::metrics_json json_metrics(json_channel, enb.get());

srsenb/src/metrics_csv.cc

@@ -27,7 +27,8 @@ using namespace std;
 
 namespace srsenb {
 
-metrics_csv::metrics_csv(std::string filename) : n_reports(0), metrics_report_period(1.0), enb(NULL)
+metrics_csv::metrics_csv(std::string filename, enb_metrics_interface* enb_) :
+  n_reports(0), metrics_report_period(1.0), enb(enb_)
 {
   file.open(filename.c_str(), std::ios_base::out);
 }
@@ -37,11 +38,6 @@ metrics_csv::~metrics_csv()
   stop();
 }
 
-void metrics_csv::set_handle(enb_metrics_interface* enb_)
-{
-  enb = enb_;
-}
-
 void metrics_csv::stop()
 {
   if (file.is_open()) {

srsenb/test/enb_metrics_test.cc

@@ -201,8 +201,7 @@ int main(int argc, char** argv)
   metrics_screen.set_handle(&enb);
 
   // the CSV file writer
-  metrics_csv metrics_file(csv_file_name);
-  metrics_file.set_handle(&enb);
+  metrics_csv metrics_file(csv_file_name, &enb);
 
   // create metrics hub and register metrics for stdout
   srsran::metrics_hub<enb_metrics_t> metricshub;