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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
commit | e6918187568dbd01842d8d1d2c808ce16a894239 (patch) | |
tree | 64f88b554b444a49f656b6c656111a145cbbaa28 /src/rocksdb/db/flush_scheduler.h | |
parent | Initial commit. (diff) | |
download | ceph-e6918187568dbd01842d8d1d2c808ce16a894239.tar.xz ceph-e6918187568dbd01842d8d1d2c808ce16a894239.zip |
Adding upstream version 18.2.2.upstream/18.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/rocksdb/db/flush_scheduler.h')
-rw-r--r-- | src/rocksdb/db/flush_scheduler.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/src/rocksdb/db/flush_scheduler.h b/src/rocksdb/db/flush_scheduler.h new file mode 100644 index 000000000..eb03f3e11 --- /dev/null +++ b/src/rocksdb/db/flush_scheduler.h @@ -0,0 +1,55 @@ +// Copyright (c) 2011-present, Facebook, Inc. All rights reserved. +// This source code is licensed under both the GPLv2 (found in the +// COPYING file in the root directory) and Apache 2.0 License +// (found in the LICENSE.Apache file in the root directory). + +#pragma once + +#include <atomic> +#include <cstdint> +#include <mutex> +#include <set> + +#include "util/autovector.h" + +namespace ROCKSDB_NAMESPACE { + +class ColumnFamilyData; + +// FlushScheduler keeps track of all column families whose memtable may +// be full and require flushing. Unless otherwise noted, all methods on +// FlushScheduler should be called only with the DB mutex held or from +// a single-threaded recovery context. +class FlushScheduler { + public: + FlushScheduler() : head_(nullptr) {} + + // May be called from multiple threads at once, but not concurrent with + // any other method calls on this instance + void ScheduleWork(ColumnFamilyData* cfd); + + // Removes and returns Ref()-ed column family. Client needs to Unref(). + // Filters column families that have been dropped. + ColumnFamilyData* TakeNextColumnFamily(); + + // This can be called concurrently with ScheduleWork but it would miss all + // the scheduled flushes after the last synchronization. This would result + // into less precise enforcement of memtable sizes but should not matter much. + bool Empty(); + + void Clear(); + + private: + struct Node { + ColumnFamilyData* column_family; + Node* next; + }; + + std::atomic<Node*> head_; +#ifndef NDEBUG + std::mutex checking_mutex_; + std::set<ColumnFamilyData*> checking_set_; +#endif // NDEBUG +}; + +} // namespace ROCKSDB_NAMESPACE |