DsoRootLock.cxx

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/*
  Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
*/
#include "CxxUtils/AthDsoCbk.h"
#include "CxxUtils/checker_macros.h"
#include "TVirtualRWMutex.h"
 
 
class DsoRootLock
{
public:
  DsoRootLock();
 
 
  static int hook (const ath_dso_event* event, void* userdata);
};
 
 
DsoRootLock::DsoRootLock()
{
  ath_dso_cbk_register (hook, nullptr);
}
 
 
int DsoRootLock::hook (const ath_dso_event* event, void* /*userdata*/)
{
  // Skip for Xrd libraries --- otherwise we can deadlock.
  if (event->fname && strncmp (event->fname, "libXrd", 6) == 0) return 0;
 
  // If the core mutex has been created, acquire it before loading
  // a library and release it on completion.
  // Hope these are always properly nested!
  ROOT::TVirtualRWMutex* m ATLAS_THREAD_SAFE = ROOT::gCoreMutex;
  if (m) {
    if (event->step == 0) {
      m->WriteLock();
    }
    else if (event->step == 1)
    {
      m->WriteUnLock(nullptr);
    }
  }
  return 0;
}
 
 
const DsoRootLock dsoRootLock;