fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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50 lines
1.4 KiB
50 lines
1.4 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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// This source code is also licensed under the GPLv2 license found in the
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// COPYING file in the root directory of this source tree.
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#pragma once
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#include <stdint.h>
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#include <atomic>
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#include <mutex>
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#include <set>
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namespace rocksdb {
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class ColumnFamilyData;
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// Unless otherwise noted, all methods on FlushScheduler should be called
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// only with the DB mutex held or from a single-threaded recovery context.
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class FlushScheduler {
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public:
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FlushScheduler() : head_(nullptr) {}
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// May be called from multiple threads at once, but not concurrent with
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// any other method calls on this instance
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void ScheduleFlush(ColumnFamilyData* cfd);
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// Removes and returns Ref()-ed column family. Client needs to Unref().
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// Filters column families that have been dropped.
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ColumnFamilyData* TakeNextColumnFamily();
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bool Empty();
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void Clear();
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private:
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struct Node {
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ColumnFamilyData* column_family;
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Node* next;
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};
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std::atomic<Node*> head_;
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#ifndef NDEBUG
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std::mutex checking_mutex_;
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std::set<ColumnFamilyData*> checking_set_;
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#endif // NDEBUG
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};
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} // namespace rocksdb
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