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diff --git a/src/ceph/src/common/Semaphore.h b/src/ceph/src/common/Semaphore.h
new file mode 100644
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--- /dev/null
+++ b/src/ceph/src/common/Semaphore.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) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * 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.
+ * 
+ */
+
+
+#ifndef CEPH_Sem_Posix__H
+#define CEPH_Sem_Posix__H
+
+class Semaphore
+{
+  Mutex m;
+  Cond c;
+  int count;
+
+  public:
+
+  Semaphore() : m("Semaphore::m")
+  {
+    count = 0;
+  }
+
+  void Put()
+  { 
+    m.Lock();
+    count++;
+    c.Signal();
+    m.Unlock();
+  }
+
+  void Get() 
+  { 
+    m.Lock();
+    while(count <= 0) {
+      c.Wait(m);
+    }
+    count--;
+    m.Unlock();
+  }
+};
+
+#endif // !_Mutex_Posix_