fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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55 lines
1.6 KiB
55 lines
1.6 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <atomic>
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#include <cstdint>
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#include <mutex>
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#include <set>
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#include "util/autovector.h"
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namespace ROCKSDB_NAMESPACE {
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class ColumnFamilyData;
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// FlushScheduler keeps track of all column families whose memtable may
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// be full and require flushing. Unless otherwise noted, all methods on
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// FlushScheduler should be called only with the DB mutex held or from
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// 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 ScheduleWork(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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// This can be called concurrently with ScheduleWork but it would miss all
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// the scheduled flushes after the last synchronization. This would result
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// into less precise enforcement of memtable sizes but should not matter much.
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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_NAMESPACE
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