mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-26 16:30:56 +00:00
5cf6ab6f31
Summary: Ran `find ./db/ -type f | xargs clang-format -i`. Excluded minor changes it tried to make on db/db_impl/. Everything else it changed was directly under db/ directory. Included minor manual touchups mentioned in PR commit history. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10910 Reviewed By: riversand963 Differential Revision: D40880683 Pulled By: ajkr fbshipit-source-id: cfe26cda05b3fb9a72e3cb82c286e21d8c5c4174
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
// 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 <stdint.h>
|
|
|
|
#include <atomic>
|
|
#include <mutex>
|
|
|
|
#include "util/autovector.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
class ColumnFamilyData;
|
|
|
|
// Similar to FlushScheduler, TrimHistoryScheduler is a FIFO queue that keeps
|
|
// track of column families whose flushed immutable memtables may need to be
|
|
// removed (aka trimmed). The actual trimming may be slightly delayed. Due to
|
|
// the use of the mutex and atomic variable, ScheduleWork,
|
|
// TakeNextColumnFamily, and, Empty can be called concurrently.
|
|
class TrimHistoryScheduler {
|
|
public:
|
|
TrimHistoryScheduler() : is_empty_(true) {}
|
|
|
|
// When a column family needs history trimming, add cfd to the FIFO queue
|
|
void ScheduleWork(ColumnFamilyData* cfd);
|
|
|
|
// Remove the column family from the queue, the caller is responsible for
|
|
// calling `MemtableList::TrimHistory`
|
|
ColumnFamilyData* TakeNextColumnFamily();
|
|
|
|
bool Empty();
|
|
|
|
void Clear();
|
|
|
|
// Not on critical path, use mutex to ensure thread safety
|
|
private:
|
|
std::atomic<bool> is_empty_;
|
|
autovector<ColumnFamilyData*> cfds_;
|
|
std::mutex checking_mutex_;
|
|
};
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|