CrashRecoveryContext::~CrashRecoveryContext() {
  // Reclaim registered resources.
  CrashRecoveryContextCleanup *i = head;
  tlIsRecoveringFromCrash.set(head);
  while (i) {
    CrashRecoveryContextCleanup *tmp = i;
    i = tmp->next;
    tmp->cleanupFired = true;
    tmp->recoverResources();
    delete tmp;
  }
  tlIsRecoveringFromCrash.erase();
  
  CrashRecoveryContextImpl *CRCI = (CrashRecoveryContextImpl *) Impl;
  delete CRCI;
}

void CrashRecoveryContext::Disable() {
  sys::ScopedLock L(*gCrashRecoveryContextMutex);

  if (!gCrashRecoveryEnabled)
    return;

  gCrashRecoveryEnabled = false;

  PVOID currentHandle = const_cast<PVOID>(sCurrentExceptionHandle.get());
  if (currentHandle) {
    // Now we can remove the vectored exception handler from the chain
    ::RemoveVectoredExceptionHandler(currentHandle);

    // Reset the handle in our thread-local set.
    sCurrentExceptionHandle.set(NULL);
  }
}

void CrashRecoveryContext::Enable() {
  sys::ScopedLock L(*gCrashRecoveryContextMutex);

  if (gCrashRecoveryEnabled)
    return;

  gCrashRecoveryEnabled = true;

  // We can set up vectored exception handling now.  We will install our
  // handler as the front of the list, though there's no assurances that
  // it will remain at the front (another call could install itself before
  // our handler).  This 1) isn't likely, and 2) shouldn't cause problems.
  PVOID handle = ::AddVectoredExceptionHandler(1, ExceptionHandler);
  sCurrentExceptionHandle.set(handle);
}

bool CrashRecoveryContext::isRecoveringFromCrash() {
  return tlIsRecoveringFromCrash.get() != 0;
}