--- /dev/null
+// -*- 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_