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diff --git a/cpp/src/qpid/legacystore/jrnl/cvar.h b/cpp/src/qpid/legacystore/jrnl/cvar.h
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+++ b/cpp/src/qpid/legacystore/jrnl/cvar.h
@@ -0,0 +1,87 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+
+/**
+ * \file cvar.h
+ *
+ * Qpid asynchronous store plugin library
+ *
+ * This file contains a posix condition variable class.
+ *
+ * \author Kim van der Riet
+ */
+
+#ifndef QPID_LEGACYSTORE_JRNL_CVAR_H
+#define QPID_LEGACYSTORE_JRNL_CVAR_H
+
+#include <cstring>
+#include "qpid/legacystore/jrnl/jerrno.h"
+#include "qpid/legacystore/jrnl/jexception.h"
+#include "qpid/legacystore/jrnl/smutex.h"
+#include "qpid/legacystore/jrnl/time_ns.h"
+#include <pthread.h>
+#include <sstream>
+
+namespace mrg
+{
+namespace journal
+{
+
+    // Ultra-simple thread condition variable class
+    class cvar
+    {
+    private:
+        const smutex& _sm;
+        pthread_cond_t _c;
+    public:
+        inline cvar(const smutex& sm) : _sm(sm) { ::pthread_cond_init(&_c, 0); }
+        inline ~cvar() { ::pthread_cond_destroy(&_c); }
+        inline void wait()
+        {
+            PTHREAD_CHK(::pthread_cond_wait(&_c, _sm.get()), "::pthread_cond_wait", "cvar", "wait");
+        }
+        inline void timedwait(timespec& ts)
+        {
+            PTHREAD_CHK(::pthread_cond_timedwait(&_c, _sm.get(), &ts), "::pthread_cond_timedwait", "cvar", "timedwait");
+        }
+        inline bool waitintvl(const long intvl_ns)
+        {
+            time_ns t; t.now(); t+=intvl_ns;
+            int ret = ::pthread_cond_timedwait(&_c, _sm.get(), &t);
+            if (ret == ETIMEDOUT)
+                return true;
+            PTHREAD_CHK(ret, "::pthread_cond_timedwait", "cvar", "waitintvl");
+            return false;
+        }
+        inline void signal()
+        {
+            PTHREAD_CHK(::pthread_cond_signal(&_c), "::pthread_cond_signal", "cvar", "notify");
+        }
+        inline void broadcast()
+        {
+            PTHREAD_CHK(::pthread_cond_broadcast(&_c), "::pthread_cond_broadcast", "cvar", "broadcast");
+        }
+    };
+
+} // namespace journal
+} // namespace mrg
+
+#endif // ifndef QPID_LEGACYSTORE_JRNL_CVAR_H