mirror of https://github.com/facebook/rocksdb.git
99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under the BSD-style license found in the
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
|
|
|
#pragma once
|
|
#ifndef ROCKSDB_LITE
|
|
|
|
#include <chrono>
|
|
#include <string>
|
|
#include <unordered_map>
|
|
#include <vector>
|
|
|
|
#include "rocksdb/utilities/transaction.h"
|
|
#include "util/instrumented_mutex.h"
|
|
#include "util/thread_local.h"
|
|
#include "utilities/transactions/transaction_impl.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
class ColumnFamilyHandle;
|
|
struct LockInfo;
|
|
struct LockMap;
|
|
struct LockMapStripe;
|
|
|
|
class Slice;
|
|
class TransactionDBImpl;
|
|
|
|
class TransactionLockMgr {
|
|
public:
|
|
TransactionLockMgr(TransactionDB* txn_db, size_t default_num_stripes,
|
|
int64_t max_num_locks,
|
|
std::shared_ptr<TransactionDBMutexFactory> factory);
|
|
|
|
~TransactionLockMgr();
|
|
|
|
// Creates a new LockMap for this column family. Caller should guarantee
|
|
// that this column family does not already exist.
|
|
void AddColumnFamily(uint32_t column_family_id);
|
|
|
|
// Deletes the LockMap for this column family. Caller should guarantee that
|
|
// this column family is no longer in use.
|
|
void RemoveColumnFamily(uint32_t column_family_id);
|
|
|
|
// Attempt to lock key. If OK status is returned, the caller is responsible
|
|
// for calling UnLock() on this key.
|
|
Status TryLock(const TransactionImpl* txn, uint32_t column_family_id,
|
|
const std::string& key, Env* env);
|
|
|
|
// Unlock a key locked by TryLock(). txn must be the same Transaction that
|
|
// locked this key.
|
|
void UnLock(const TransactionImpl* txn, const TransactionKeyMap* keys,
|
|
Env* env);
|
|
void UnLock(TransactionImpl* txn, uint32_t column_family_id,
|
|
const std::string& key, Env* env);
|
|
|
|
private:
|
|
TransactionDBImpl* txn_db_impl_;
|
|
|
|
// Default number of lock map stripes per column family
|
|
const size_t default_num_stripes_;
|
|
|
|
// Limit on number of keys locked per column family
|
|
const int64_t max_num_locks_;
|
|
|
|
// Used to allocate mutexes/condvars to use when locking keys
|
|
std::shared_ptr<TransactionDBMutexFactory> mutex_factory_;
|
|
|
|
// Must be held when accessing/modifying lock_maps_
|
|
InstrumentedMutex lock_map_mutex_;
|
|
|
|
// Map of ColumnFamilyId to locked key info
|
|
using LockMaps = std::unordered_map<uint32_t, std::shared_ptr<LockMap>>;
|
|
LockMaps lock_maps_;
|
|
|
|
// Thread-local cache of entries in lock_maps_. This is an optimization
|
|
// to avoid acquiring a mutex in order to look up a LockMap
|
|
std::unique_ptr<ThreadLocalPtr> lock_maps_cache_;
|
|
|
|
bool IsLockExpired(const LockInfo& lock_info, Env* env, uint64_t* wait_time);
|
|
|
|
std::shared_ptr<LockMap> GetLockMap(uint32_t column_family_id);
|
|
|
|
Status AcquireWithTimeout(LockMap* lock_map, LockMapStripe* stripe,
|
|
const std::string& key, Env* env, int64_t timeout,
|
|
const LockInfo& lock_info);
|
|
|
|
Status AcquireLocked(LockMap* lock_map, LockMapStripe* stripe,
|
|
const std::string& key, Env* env,
|
|
const LockInfo& lock_info, uint64_t* wait_time);
|
|
|
|
// No copying allowed
|
|
TransactionLockMgr(const TransactionLockMgr&);
|
|
void operator=(const TransactionLockMgr&);
|
|
};
|
|
|
|
} // namespace rocksdb
|
|
#endif // ROCKSDB_LITE
|