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/// Accessor to next ceph pool index
/// Note that this is not thread safe, but we do not care
/// as we only want a rough load balancing
unsigned int getCephPoolIdxAndIncrease() {
  if (g_radosStripers.size() == 0) {
    // make sure we do not have a race condition here
    XrdSysMutexHelper lock(g_init_mutex);
    // double check now that we have the lock
    if (g_radosStripers.size() == 0) {
      // initialization phase : allocate corresponding places in the vectors
      for (unsigned int i = 0; i < g_maxCephPoolIdx; i++) {
        g_radosStripers.push_back(StriperDict());
        g_ioCtx.push_back(IOCtxDict());
        g_cluster.push_back(0);
      }
    }
  }