Update from trunk r1375509 through r1450773asyncstore

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/asyncstore@1451244 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 85 insertions, 0 deletions

diff --git a/cpp/src/qpid/legacystore/jrnl/slock.h b/cpp/src/qpid/legacystore/jrnl/slock.h
new file mode 100644
index 0000000000..c05b5cf336
--- /dev/null
+++ b/cpp/src/qpid/legacystore/jrnl/slock.h
@@ -0,0 +1,85 @@
+/*
+ *
+ * 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 slock.h
+ *
+ * Qpid asynchronous store plugin library
+ *
+ * Messaging journal scoped lock class mrg::journal::slock and scoped try-lock
+ * class mrg::journal::stlock.
+ *
+ * \author Kim van der Riet
+ */
+
+#ifndef QPID_LEGACYSTORE_JRNL_SLOCK_H
+#define QPID_LEGACYSTORE_JRNL_SLOCK_H
+
+#include "qpid/legacystore/jrnl/jexception.h"
+#include "qpid/legacystore/jrnl/smutex.h"
+#include <pthread.h>
+
+namespace mrg
+{
+namespace journal
+{
+
+    // Ultra-simple scoped lock class, auto-releases mutex when it goes out-of-scope
+    class slock
+    {
+    protected:
+        const smutex& _sm;
+    public:
+        inline slock(const smutex& sm) : _sm(sm)
+        {
+            PTHREAD_CHK(::pthread_mutex_lock(_sm.get()), "::pthread_mutex_lock", "slock", "slock");
+        }
+        inline ~slock()
+        {
+            PTHREAD_CHK(::pthread_mutex_unlock(_sm.get()), "::pthread_mutex_unlock", "slock", "~slock");
+        }
+    };
+
+    // Ultra-simple scoped try-lock class, auto-releases mutex when it goes out-of-scope
+    class stlock
+    {
+    protected:
+        const smutex& _sm;
+        bool _locked;
+    public:
+        inline stlock(const smutex& sm) : _sm(sm), _locked(false)
+        {
+            int ret = ::pthread_mutex_trylock(_sm.get());
+            _locked = (ret == 0); // check if lock obtained
+            if (!_locked && ret != EBUSY) PTHREAD_CHK(ret, "::pthread_mutex_trylock", "stlock", "stlock");
+        }
+        inline ~stlock()
+        {
+            if (_locked)
+                PTHREAD_CHK(::pthread_mutex_unlock(_sm.get()), "::pthread_mutex_unlock", "stlock", "~stlock");
+        }
+        inline bool locked() const { return _locked; }
+    };
+
+} // namespace journal
+} // namespace mrg
+
+#endif // ifndef QPID_LEGACYSTORE_JRNL_SLOCK_H