Function _record_backtrace

lib/cpp/src/thrift/VirtualProfiling.cpp:253–266

Mutex generic_calls_mutex;

void _record_backtrace(BacktraceMap* map, const Mutex& mutex, Key* k) {
  Guard guard(mutex);

  BacktraceMap::iterator it = map->find(*k);
  if (it == map->end()) {
    k->makePersistent();
    map->insert(std::make_pair(*k, 1));
  } else {
    // increment the count
    // NOTE: we could assert if it->second is 0 afterwards, since that would
    // mean we've wrapped.
    ++(it->second);
  }
}

/**
 * Record an unnecessary virtual function call.