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diff --git a/src/ceph/src/test/system/cross_process_sem.h b/src/ceph/src/test/system/cross_process_sem.h
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+++ b/src/ceph/src/test/system/cross_process_sem.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+* Ceph - scalable distributed file system
+*
+* Copyright (C) 2011 New Dream Network
+*
+* This is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License version 2.1, as published by the Free Software
+* Foundation.  See file COPYING.
+*
+*/
+
+struct cross_process_sem_data_t;
+
+class CrossProcessSem
+{
+public:
+  static int create(int initial_val, CrossProcessSem** ret);
+  ~CrossProcessSem();
+
+  /* Initialize the semaphore. Must be called before any operations */
+  int init();
+
+  /* Semaphore wait */
+  void wait();
+
+  /* Semaphore post */
+  void post();
+
+  /* Reinitialize the semaphore to the desired value.
+   * NOT thread-safe if it is in use at the time!
+   */ 
+  int reinit(int dval);
+
+private:
+  explicit CrossProcessSem(struct cross_process_sem_data_t *data);
+  struct cross_process_sem_data_t *m_data;
+};