mirror of https://gitee.com/bigwinds/arangodb
98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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/// @author Achim Brandt
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_BASICS_MUTEX_H
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#define ARANGODB_BASICS_MUTEX_H 1
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#if __has_include(<pthread.h>)
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#include <pthread.h>
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#endif
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#include "Basics/operating-system.h"
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#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
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#define ARANGODB_ENABLE_DEADLOCK_DETECTION
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#if defined(__SANITIZE_THREAD__)
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// Avoid false positives with ThreadSanitizer
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#undef ARANGODB_ENABLE_DEADLOCK_DETECTION
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#elif defined(__has_feature)
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#if __has_feature(thread_sanitizer)
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#undef ARANGODB_ENABLE_DEADLOCK_DETECTION
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#endif
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#endif
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#endif
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#ifdef ARANGODB_ENABLE_DEADLOCK_DETECTION
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#include "Basics/Thread.h"
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#endif
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#ifdef TRI_HAVE_POSIX_THREADS
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#include <pthread.h>
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#endif
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namespace arangodb {
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class Mutex {
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private:
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Mutex(Mutex const&) = delete;
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Mutex& operator=(Mutex const&) = delete;
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public:
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Mutex();
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~Mutex();
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public:
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void lock();
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bool tryLock();
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void unlock();
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// assert that the mutex is locked by the current thread. will do
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// nothing in non-maintainer mode and will do nothing for non-posix locks
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#ifdef ARANGODB_ENABLE_DEADLOCK_DETECTION
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void assertLockedByCurrentThread();
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void assertNotLockedByCurrentThread();
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#else
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inline void assertLockedByCurrentThread() {}
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inline void assertNotLockedByCurrentThread() {}
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#endif
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private:
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#ifdef TRI_HAVE_POSIX_THREADS
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pthread_mutex_t _mutex;
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pthread_mutexattr_t _attributes;
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#endif
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#ifdef TRI_HAVE_WIN32_THREADS
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// as of VS2013, exclusive SRWLocks tend to be faster than native mutexes
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SRWLOCK _mutex;
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#endif
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#ifdef ARANGODB_ENABLE_DEADLOCK_DETECTION
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TRI_tid_t _holder;
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#endif
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};
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} // namespace arangodb
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#endif
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