fdf882ded2
Summary: When dynamically linking two binaries together, different builds of RocksDB from two sources might cause errors. To provide a tool for user to solve the problem, the RocksDB namespace is changed to a flag which can be overridden in build time. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6433 Test Plan: Build release, all and jtest. Try to build with ROCKSDB_NAMESPACE with another flag. Differential Revision: D19977691 fbshipit-source-id: aa7f2d0972e1c31d75339ac48478f34f6cfcfb3e
135 lines
5.1 KiB
C++
135 lines
5.1 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <string>
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#include "monitoring/thread_status_updater.h"
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#include "rocksdb/db.h"
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#include "rocksdb/env.h"
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#include "rocksdb/thread_status.h"
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namespace ROCKSDB_NAMESPACE {
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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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// Register the current thread for tracking.
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static void RegisterThread(
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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(const DB* db, const ColumnFamilyData* cfd,
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const std::string& cf_name, const Env* env);
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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, const Env* env,
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bool enable_thread_tracking);
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static void SetThreadOperation(ThreadStatus::OperationType type);
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static ThreadStatus::OperationStage SetThreadOperationStage(
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ThreadStatus::OperationStage stage);
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static void SetThreadOperationProperty(
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int code, uint64_t value);
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static void IncreaseThreadOperationProperty(
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int code, uint64_t delta);
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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_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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#ifdef 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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// A helper class for updating thread state. It will set the
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// thread state according to the input parameter in its constructor
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// and set the thread state to the previous state in its destructor.
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class AutoThreadOperationStageUpdater {
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public:
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explicit AutoThreadOperationStageUpdater(
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ThreadStatus::OperationStage stage);
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~AutoThreadOperationStageUpdater();
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#ifdef ROCKSDB_USING_THREAD_STATUS
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private:
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ThreadStatus::OperationStage prev_stage_;
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#endif
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};
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} // namespace ROCKSDB_NAMESPACE
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