mirror of https://gitee.com/bigwinds/arangodb
68 lines
2.0 KiB
C++
68 lines
2.0 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 Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_BASICS_OPEN_FILES_TRACKER_H
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#define ARANGODB_BASICS_OPEN_FILES_TRACKER_H 1
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#include "Basics/Common.h"
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#define TRI_TRACKED_CREATE_FILE(a, b, c) \
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arangodb::OpenFilesTracker::instance()->create((a), (b), (c))
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#define TRI_TRACKED_OPEN_FILE(a, b) \
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arangodb::OpenFilesTracker::instance()->open((a), (b))
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#define TRI_TRACKED_CLOSE_FILE arangodb::OpenFilesTracker::instance()->close
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namespace arangodb {
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class OpenFilesTracker {
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public:
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OpenFilesTracker();
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~OpenFilesTracker();
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int create(char const* path, int oflag, int mode);
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int open(char const* path, int oflag);
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int close(int fd) noexcept;
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uint64_t numOpenFiles() const { return _numOpenFiles.load(); }
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void warnThreshold(uint64_t threshold) {
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_warnThreshold = threshold;
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_lastWarning = 0.0;
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}
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static OpenFilesTracker* instance();
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private:
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void increase();
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void decrease() noexcept;
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private:
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std::atomic<uint64_t> _numOpenFiles;
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uint64_t _warnThreshold; // configured threshold
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double _lastWarning; // timestamp of last warning
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};
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} // namespace arangodb
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#endif
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