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-rw-r--r--src/leveldb/db/db_impl.h146
1 files changed, 76 insertions, 70 deletions
diff --git a/src/leveldb/db/db_impl.h b/src/leveldb/db/db_impl.h
index 8ff323e728..685735c733 100644
--- a/src/leveldb/db/db_impl.h
+++ b/src/leveldb/db/db_impl.h
@@ -5,8 +5,11 @@
#ifndef STORAGE_LEVELDB_DB_DB_IMPL_H_
#define STORAGE_LEVELDB_DB_DB_IMPL_H_
+#include <atomic>
#include <deque>
#include <set>
+#include <string>
+
#include "db/dbformat.h"
#include "db/log_writer.h"
#include "db/snapshot.h"
@@ -26,21 +29,25 @@ class VersionSet;
class DBImpl : public DB {
public:
DBImpl(const Options& options, const std::string& dbname);
- virtual ~DBImpl();
+
+ DBImpl(const DBImpl&) = delete;
+ DBImpl& operator=(const DBImpl&) = delete;
+
+ ~DBImpl() override;
// Implementations of the DB interface
- virtual Status Put(const WriteOptions&, const Slice& key, const Slice& value);
- virtual Status Delete(const WriteOptions&, const Slice& key);
- virtual Status Write(const WriteOptions& options, WriteBatch* updates);
- virtual Status Get(const ReadOptions& options,
- const Slice& key,
- std::string* value);
- virtual Iterator* NewIterator(const ReadOptions&);
- virtual const Snapshot* GetSnapshot();
- virtual void ReleaseSnapshot(const Snapshot* snapshot);
- virtual bool GetProperty(const Slice& property, std::string* value);
- virtual void GetApproximateSizes(const Range* range, int n, uint64_t* sizes);
- virtual void CompactRange(const Slice* begin, const Slice* end);
+ Status Put(const WriteOptions&, const Slice& key,
+ const Slice& value) override;
+ Status Delete(const WriteOptions&, const Slice& key) override;
+ Status Write(const WriteOptions& options, WriteBatch* updates) override;
+ Status Get(const ReadOptions& options, const Slice& key,
+ std::string* value) override;
+ Iterator* NewIterator(const ReadOptions&) override;
+ const Snapshot* GetSnapshot() override;
+ void ReleaseSnapshot(const Snapshot* snapshot) override;
+ bool GetProperty(const Slice& property, std::string* value) override;
+ void GetApproximateSizes(const Range* range, int n, uint64_t* sizes) override;
+ void CompactRange(const Slice* begin, const Slice* end) override;
// Extra methods (for testing) that are not in the public DB interface
@@ -69,6 +76,31 @@ class DBImpl : public DB {
struct CompactionState;
struct Writer;
+ // Information for a manual compaction
+ struct ManualCompaction {
+ int level;
+ bool done;
+ const InternalKey* begin; // null means beginning of key range
+ const InternalKey* end; // null means end of key range
+ InternalKey tmp_storage; // Used to keep track of compaction progress
+ };
+
+ // Per level compaction stats. stats_[level] stores the stats for
+ // compactions that produced data for the specified "level".
+ struct CompactionStats {
+ CompactionStats() : micros(0), bytes_read(0), bytes_written(0) {}
+
+ void Add(const CompactionStats& c) {
+ this->micros += c.micros;
+ this->bytes_read += c.bytes_read;
+ this->bytes_written += c.bytes_written;
+ }
+
+ int64_t micros;
+ int64_t bytes_read;
+ int64_t bytes_written;
+ };
+
Iterator* NewInternalIterator(const ReadOptions&,
SequenceNumber* latest_snapshot,
uint32_t* seed);
@@ -84,7 +116,7 @@ class DBImpl : public DB {
void MaybeIgnoreError(Status* s) const;
// Delete any unneeded files and stale in-memory entries.
- void DeleteObsoleteFiles();
+ void DeleteObsoleteFiles() EXCLUSIVE_LOCKS_REQUIRED(mutex_);
// Compact the in-memory write buffer to disk. Switches to a new
// log-file/memtable and writes a new descriptor iff successful.
@@ -100,14 +132,15 @@ class DBImpl : public DB {
Status MakeRoomForWrite(bool force /* compact even if there is room? */)
EXCLUSIVE_LOCKS_REQUIRED(mutex_);
- WriteBatch* BuildBatchGroup(Writer** last_writer);
+ WriteBatch* BuildBatchGroup(Writer** last_writer)
+ EXCLUSIVE_LOCKS_REQUIRED(mutex_);
void RecordBackgroundError(const Status& s);
void MaybeScheduleCompaction() EXCLUSIVE_LOCKS_REQUIRED(mutex_);
static void BGWork(void* db);
void BackgroundCall();
- void BackgroundCompaction() EXCLUSIVE_LOCKS_REQUIRED(mutex_);
+ void BackgroundCompaction() EXCLUSIVE_LOCKS_REQUIRED(mutex_);
void CleanupCompaction(CompactionState* compact)
EXCLUSIVE_LOCKS_REQUIRED(mutex_);
Status DoCompactionWork(CompactionState* compact)
@@ -118,93 +151,66 @@ class DBImpl : public DB {
Status InstallCompactionResults(CompactionState* compact)
EXCLUSIVE_LOCKS_REQUIRED(mutex_);
+ const Comparator* user_comparator() const {
+ return internal_comparator_.user_comparator();
+ }
+
// Constant after construction
Env* const env_;
const InternalKeyComparator internal_comparator_;
const InternalFilterPolicy internal_filter_policy_;
const Options options_; // options_.comparator == &internal_comparator_
- bool owns_info_log_;
- bool owns_cache_;
+ const bool owns_info_log_;
+ const bool owns_cache_;
const std::string dbname_;
// table_cache_ provides its own synchronization
- TableCache* table_cache_;
+ TableCache* const table_cache_;
- // Lock over the persistent DB state. Non-NULL iff successfully acquired.
+ // Lock over the persistent DB state. Non-null iff successfully acquired.
FileLock* db_lock_;
// State below is protected by mutex_
port::Mutex mutex_;
- port::AtomicPointer shutting_down_;
- port::CondVar bg_cv_; // Signalled when background work finishes
+ std::atomic<bool> shutting_down_;
+ port::CondVar background_work_finished_signal_ GUARDED_BY(mutex_);
MemTable* mem_;
- MemTable* imm_; // Memtable being compacted
- port::AtomicPointer has_imm_; // So bg thread can detect non-NULL imm_
+ MemTable* imm_ GUARDED_BY(mutex_); // Memtable being compacted
+ std::atomic<bool> has_imm_; // So bg thread can detect non-null imm_
WritableFile* logfile_;
- uint64_t logfile_number_;
+ uint64_t logfile_number_ GUARDED_BY(mutex_);
log::Writer* log_;
- uint32_t seed_; // For sampling.
+ uint32_t seed_ GUARDED_BY(mutex_); // For sampling.
// Queue of writers.
- std::deque<Writer*> writers_;
- WriteBatch* tmp_batch_;
+ std::deque<Writer*> writers_ GUARDED_BY(mutex_);
+ WriteBatch* tmp_batch_ GUARDED_BY(mutex_);
- SnapshotList snapshots_;
+ SnapshotList snapshots_ GUARDED_BY(mutex_);
// Set of table files to protect from deletion because they are
// part of ongoing compactions.
- std::set<uint64_t> pending_outputs_;
+ std::set<uint64_t> pending_outputs_ GUARDED_BY(mutex_);
// Has a background compaction been scheduled or is running?
- bool bg_compaction_scheduled_;
+ bool background_compaction_scheduled_ GUARDED_BY(mutex_);
- // Information for a manual compaction
- struct ManualCompaction {
- int level;
- bool done;
- const InternalKey* begin; // NULL means beginning of key range
- const InternalKey* end; // NULL means end of key range
- InternalKey tmp_storage; // Used to keep track of compaction progress
- };
- ManualCompaction* manual_compaction_;
+ ManualCompaction* manual_compaction_ GUARDED_BY(mutex_);
- VersionSet* versions_;
+ VersionSet* const versions_ GUARDED_BY(mutex_);
// Have we encountered a background error in paranoid mode?
- Status bg_error_;
-
- // Per level compaction stats. stats_[level] stores the stats for
- // compactions that produced data for the specified "level".
- struct CompactionStats {
- int64_t micros;
- int64_t bytes_read;
- int64_t bytes_written;
-
- CompactionStats() : micros(0), bytes_read(0), bytes_written(0) { }
+ Status bg_error_ GUARDED_BY(mutex_);
- void Add(const CompactionStats& c) {
- this->micros += c.micros;
- this->bytes_read += c.bytes_read;
- this->bytes_written += c.bytes_written;
- }
- };
- CompactionStats stats_[config::kNumLevels];
-
- // No copying allowed
- DBImpl(const DBImpl&);
- void operator=(const DBImpl&);
-
- const Comparator* user_comparator() const {
- return internal_comparator_.user_comparator();
- }
+ CompactionStats stats_[config::kNumLevels] GUARDED_BY(mutex_);
};
// Sanitize db options. The caller should delete result.info_log if
// it is not equal to src.info_log.
-extern Options SanitizeOptions(const std::string& db,
- const InternalKeyComparator* icmp,
- const InternalFilterPolicy* ipolicy,
- const Options& src);
+Options SanitizeOptions(const std::string& db,
+ const InternalKeyComparator* icmp,
+ const InternalFilterPolicy* ipolicy,
+ const Options& src);
} // namespace leveldb
generated by cgit v1.2.3 (git 2.26.2) at 2024-07-20 20:03:46 +0000