rocksdb/port/win/env_win.h

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// 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.
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
//
// An Env is an interface used by the rocksdb implementation to access
// operating system functionality like the filesystem etc. Callers
// may wish to provide a custom Env object when opening a database to
// get fine gain control; e.g., to rate limit file system operations.
//
// All Env implementations are safe for concurrent access from
// multiple threads without any external synchronization.
#pragma once
#include <rocksdb/env.h>
#include "util/threadpool.h"
#include <mutex>
#include <vector>
namespace rocksdb {
namespace port {
// Currently not designed for inheritance but rather a replacement
class WinEnvThreads {
public:
explicit WinEnvThreads(Env* hosted_env);
~WinEnvThreads();
WinEnvThreads(const WinEnvThreads&) = delete;
WinEnvThreads& operator=(const WinEnvThreads&) = delete;
void Schedule(void(*function)(void*), void* arg, Env::Priority pri,
void* tag,
void(*unschedFunction)(void* arg));
int UnSchedule(void* arg, Env::Priority pri);
void StartThread(void(*function)(void* arg), void* arg);
void WaitForJoin();
unsigned int GetThreadPoolQueueLen(Env::Priority pri) const;
static uint64_t gettid();
uint64_t GetThreadID() const;
void SleepForMicroseconds(int micros);
// Allow increasing the number of worker threads.
void SetBackgroundThreads(int num, Env::Priority pri);
void IncBackgroundThreadsIfNeeded(int num, Env::Priority pri);
private:
Env* hosted_env_;
mutable std::mutex mu_;
std::vector<ThreadPool> thread_pools_;
std::vector<std::thread> threads_to_join_;
};
// Designed for inheritance so can be re-used
// but certain parts replaced
class WinEnvIO {
public:
explicit WinEnvIO(Env* hosted_env);
virtual ~WinEnvIO();
virtual Status DeleteFile(const std::string& fname);
virtual Status GetCurrentTime(int64_t* unix_time);
virtual Status NewSequentialFile(const std::string& fname,
std::unique_ptr<SequentialFile>* result,
const EnvOptions& options);
virtual Status NewRandomAccessFile(const std::string& fname,
std::unique_ptr<RandomAccessFile>* result,
const EnvOptions& options);
virtual Status NewWritableFile(const std::string& fname,
std::unique_ptr<WritableFile>* result,
const EnvOptions& options);
virtual Status NewDirectory(const std::string& name,
std::unique_ptr<Directory>* result);
virtual Status FileExists(const std::string& fname);
virtual Status GetChildren(const std::string& dir,
std::vector<std::string>* result);
virtual Status CreateDir(const std::string& name);
virtual Status CreateDirIfMissing(const std::string& name);
virtual Status DeleteDir(const std::string& name);
virtual Status GetFileSize(const std::string& fname,
uint64_t* size);
static uint64_t FileTimeToUnixTime(const FILETIME& ftTime);
virtual Status GetFileModificationTime(const std::string& fname,
uint64_t* file_mtime);
virtual Status RenameFile(const std::string& src,
const std::string& target);
virtual Status LinkFile(const std::string& src,
const std::string& target);
virtual Status LockFile(const std::string& lockFname,
FileLock** lock);
virtual Status UnlockFile(FileLock* lock);
virtual Status GetTestDirectory(std::string* result);
virtual Status NewLogger(const std::string& fname,
std::shared_ptr<Logger>* result);
virtual uint64_t NowMicros();
virtual uint64_t NowNanos();
virtual Status GetHostName(char* name, uint64_t len);
virtual Status GetAbsolutePath(const std::string& db_path,
std::string* output_path);
virtual std::string TimeToString(uint64_t secondsSince1970);
virtual EnvOptions OptimizeForLogWrite(const EnvOptions& env_options,
const DBOptions& db_options) const;
virtual EnvOptions OptimizeForManifestWrite(
const EnvOptions& env_options) const;
size_t GetPageSize() const { return page_size_; }
size_t GetAllocationGranularity() const { return allocation_granularity_; }
uint64_t GetPerfCounterFrequency() const { return perf_counter_frequency_; }
private:
// Returns true iff the named directory exists and is a directory.
virtual bool DirExists(const std::string& dname);
typedef VOID(WINAPI * FnGetSystemTimePreciseAsFileTime)(LPFILETIME);
Env* hosted_env_;
size_t page_size_;
size_t allocation_granularity_;
uint64_t perf_counter_frequency_;
FnGetSystemTimePreciseAsFileTime GetSystemTimePreciseAsFileTime_;
};
class WinEnv : public Env {
public:
WinEnv();
~WinEnv();
Status DeleteFile(const std::string& fname) override;
Status GetCurrentTime(int64_t* unix_time) override;
Status NewSequentialFile(const std::string& fname,
std::unique_ptr<SequentialFile>* result,
const EnvOptions& options) override;
Status NewRandomAccessFile(const std::string& fname,
std::unique_ptr<RandomAccessFile>* result,
const EnvOptions& options) override;
Status NewWritableFile(const std::string& fname,
std::unique_ptr<WritableFile>* result,
const EnvOptions& options) override;
Status NewDirectory(const std::string& name,
std::unique_ptr<Directory>* result) override;
Status FileExists(const std::string& fname) override;
Status GetChildren(const std::string& dir,
std::vector<std::string>* result) override;
Status CreateDir(const std::string& name) override;
Status CreateDirIfMissing(const std::string& name) override;
Status DeleteDir(const std::string& name) override;
Status GetFileSize(const std::string& fname,
uint64_t* size) override;
Status GetFileModificationTime(const std::string& fname,
uint64_t* file_mtime) override;
Status RenameFile(const std::string& src,
const std::string& target) override;
Status LinkFile(const std::string& src,
const std::string& target) override;
Status LockFile(const std::string& lockFname,
FileLock** lock) override;
Status UnlockFile(FileLock* lock) override;
Status GetTestDirectory(std::string* result) override;
Status NewLogger(const std::string& fname,
std::shared_ptr<Logger>* result) override;
uint64_t NowMicros() override;
uint64_t NowNanos() override;
Status GetHostName(char* name, uint64_t len) override;
Status GetAbsolutePath(const std::string& db_path,
std::string* output_path) override;
std::string TimeToString(uint64_t secondsSince1970) override;
Status GetThreadList(
std::vector<ThreadStatus>* thread_list) override;
void Schedule(void(*function)(void*), void* arg, Env::Priority pri,
void* tag,
void(*unschedFunction)(void* arg)) override;
int UnSchedule(void* arg, Env::Priority pri) override;
void StartThread(void(*function)(void* arg), void* arg) override;
void WaitForJoin();
unsigned int GetThreadPoolQueueLen(Env::Priority pri) const override;
uint64_t GetThreadID() const override;
void SleepForMicroseconds(int micros) override;
// Allow increasing the number of worker threads.
void SetBackgroundThreads(int num, Env::Priority pri) override;
void IncBackgroundThreadsIfNeeded(int num, Env::Priority pri) override;
EnvOptions OptimizeForLogWrite(const EnvOptions& env_options,
const DBOptions& db_options) const override;
EnvOptions OptimizeForManifestWrite(
const EnvOptions& env_options) const override;
private:
WinEnvIO winenv_io_;
WinEnvThreads winenv_threads_;
};
}
}