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+/*
+ *
+ * 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.
+ *
+ */
+
+#ifndef QPID_LINEARSTORE_JOURNAL_SLOCK_H
+#define QPID_LINEARSTORE_JOURNAL_SLOCK_H
+
+#include "qpid/linearstore/journal/smutex.h"
+#include <pthread.h>
+
+namespace qpid {
+namespace linearstore {
+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; }
+};
+
+}}}
+
+#endif // ifndef QPID_LINEARSTORE_JOURNAL_SLOCK_H