fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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111 lines
4.4 KiB
111 lines
4.4 KiB
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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#pragma once
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#include "db/column_family.h"
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#include "rocksdb/env.h"
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#include "rocksdb/thread_status.h"
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#include "util/thread_status_updater.h"
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namespace rocksdb {
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class ColumnFamilyData;
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// The static utility class for updating thread-local status.
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//
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// The thread-local status is updated via the thread-local cached
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// pointer thread_updater_local_cache_. During each function call,
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// when ThreadStatusUtil finds thread_updater_local_cache_ is
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// left uninitialized (determined by thread_updater_initialized_),
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// it will tries to initialize it using the return value of
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// Env::GetThreadStatusUpdater(). When thread_updater_local_cache_
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// is initialized by a non-null pointer, each function call will
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// then update the status of the current thread. Otherwise,
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// all function calls to ThreadStatusUtil will be no-op.
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class ThreadStatusUtil {
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public:
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// Set the thread type of the current thread.
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static void SetThreadType(
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const Env* env, ThreadStatus::ThreadType thread_type);
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// Unregister the current thread.
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static void UnregisterThread();
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// Create an entry in the global ColumnFamilyInfo table for the
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// specified column family. This function should be called only
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// when the current thread does not hold db_mutex.
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static void NewColumnFamilyInfo(
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const DB* db, const ColumnFamilyData* cfd);
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// Erase the ConstantColumnFamilyInfo that is associated with the
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// specified ColumnFamilyData. This function should be called only
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// when the current thread does not hold db_mutex.
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static void EraseColumnFamilyInfo(const ColumnFamilyData* cfd);
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// Erase all ConstantColumnFamilyInfo that is associated with the
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// specified db instance. This function should be called only when
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// the current thread does not hold db_mutex.
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static void EraseDatabaseInfo(const DB* db);
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// Update the thread status to indicate the current thread is doing
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// something related to the specified column family.
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static void SetColumnFamily(const ColumnFamilyData* cfd);
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static void SetThreadOperation(ThreadStatus::OperationType type);
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static void SetThreadState(ThreadStatus::StateType type);
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static void ResetThreadStatus();
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#ifndef NDEBUG
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static void TEST_SetOperationDelay(
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const ThreadStatus::OperationType operation, int micro);
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static void TEST_OperationDelay(
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const ThreadStatus::OperationType operation);
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static void TEST_SetStateDelay(
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const ThreadStatus::StateType state, int micro);
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static void TEST_StateDelay(const ThreadStatus::StateType state);
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#endif
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protected:
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// Initialize the thread-local ThreadStatusUpdater when it finds
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// the cached value is nullptr. Returns true if it has cached
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// a non-null pointer.
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static bool MaybeInitThreadLocalUpdater(const Env* env);
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#if ROCKSDB_USING_THREAD_STATUS
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// A boolean flag indicating whether thread_updater_local_cache_
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// is initialized. It is set to true when an Env uses any
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// ThreadStatusUtil functions using the current thread other
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// than UnregisterThread(). It will be set to false when
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// UnregisterThread() is called.
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//
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// When this variable is set to true, thread_updater_local_cache_
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// will not be updated until this variable is again set to false
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// in UnregisterThread().
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static __thread bool thread_updater_initialized_;
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// The thread-local cached ThreadStatusUpdater that caches the
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// thread_status_updater_ of the first Env that uses any ThreadStatusUtil
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// function other than UnregisterThread(). This variable will
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// be cleared when UnregisterThread() is called.
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//
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// When this variable is set to a non-null pointer, then the status
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// of the current thread will be updated when a function of
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// ThreadStatusUtil is called. Otherwise, all functions of
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// ThreadStatusUtil will be no-op.
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//
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// When thread_updater_initialized_ is set to true, this variable
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// will not be updated until this thread_updater_initialized_ is
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// again set to false in UnregisterThread().
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static __thread ThreadStatusUpdater* thread_updater_local_cache_;
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#else
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static bool thread_updater_initialized_;
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static ThreadStatusUpdater* thread_updater_local_cache_;
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#endif
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};
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} // namespace rocksdb
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