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Diffstat (limited to 'cpp/src/qpid/legacystore/jrnl/slock.h')
-rw-r--r-- | cpp/src/qpid/legacystore/jrnl/slock.h | 85 |
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 |