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rocksdb/port/win/port_win.h

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// Copyright (c) 2013, 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.
//
// See port_example.h for documentation for the following types/functions.
#ifndef STORAGE_LEVELDB_PORT_PORT_WIN_H_
#define STORAGE_LEVELDB_PORT_PORT_WIN_H_
// Always want minimum headers
#ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
#endif
// Assume that for everywhere
#undef PLATFORM_IS_LITTLE_ENDIAN
#define PLATFORM_IS_LITTLE_ENDIAN true
#include <windows.h>
#include <string>
#include <string.h>
#include <mutex>
#include <condition_variable>
#include <stdint.h>
#include "rocksdb/options.h"
#ifndef strcasecmp
#define strcasecmp _stricmp
#endif
// defined in stdio.h
#ifndef snprintf
#define snprintf _snprintf
#endif
typedef SSIZE_T ssize_t;
// size_t printf formatting named in the manner of C99 standard formatting strings such as PRIu64
// in fact, we could use that one
#define ROCKSDB_PRIszt "Iu"
#define __attribute__(A)
#ifdef ZLIB
#include <zlib.h>
#endif
#ifdef BZIP2
#include <bzlib.h>
#endif
#if defined(LZ4)
#include <lz4.h>
#include <lz4hc.h>
#endif
#ifdef SNAPPY
#include <snappy.h>
#endif
// Thread local storage on Linux
// There is thread_local in C++11
#define __thread __declspec(thread)
#ifndef PLATFORM_IS_LITTLE_ENDIAN
#define PLATFORM_IS_LITTLE_ENDIAN (__BYTE_ORDER == __LITTLE_ENDIAN)
#endif
namespace rocksdb {
#define PREFETCH(addr, rw, locality)
namespace port
{
// For use at db/file_indexer.h kLevelMaxIndex
const int LevelMaxIndex = INT32_MAX;
const bool kLittleEndian = true;
class CondVar;
class Mutex
{
public:
/* implicit */ Mutex(bool adaptive = false);
~Mutex();
void Lock();
void Unlock();
// this will assert if the mutex is not locked
// it does NOT verify that mutex is held by a calling thread
void AssertHeld();
std::unique_lock<std::mutex>& getLock() {
return lock;
}
private:
friend class CondVar;
std::mutex m_mutex;
std::unique_lock<std::mutex> lock;
#ifndef NDEBUG
bool locked_;
#endif
// No copying
Mutex(const Mutex&);
void operator=(const Mutex&);
};
class RWMutex
{
public:
RWMutex() {
InitializeSRWLock(&srwLock_);
}
void ReadLock() {
AcquireSRWLockShared(&srwLock_);
}
void WriteLock() {
AcquireSRWLockExclusive(&srwLock_);
}
void ReadUnlock() {
ReleaseSRWLockShared(&srwLock_);
}
void WriteUnlock() {
ReleaseSRWLockExclusive(&srwLock_);
}
// Empty as in POSIX
void AssertHeld() { }
private:
SRWLOCK srwLock_;
// No copying allowed
RWMutex(const RWMutex&);
void operator=(const RWMutex&);
};
class CondVar
{
public:
explicit CondVar(Mutex* mu);
~CondVar();
void Wait();
bool TimedWait(uint64_t expiration_time);
void Signal();
void SignalAll();
private:
std::condition_variable cv_;
Mutex * mu_;
};
typedef std::once_flag OnceType;
#define LEVELDB_ONCE_INIT std::once_flag::once_flag();
extern void InitOnce(OnceType* once, void (*initializer)());
inline bool Snappy_Compress(const CompressionOptions& opts, const char* input,
size_t length, ::std::string* output)
{
#ifdef SNAPPY
output->resize(snappy::MaxCompressedLength(length));
size_t outlen;
snappy::RawCompress(input, length, &(*output)[0], &outlen);
output->resize(outlen);
return true;
#endif
return false;
}
inline bool Snappy_GetUncompressedLength(const char* input, size_t length,
size_t* result) {
#ifdef SNAPPY
return snappy::GetUncompressedLength(input, length, result);
#else
return false;
#endif
}
inline bool Snappy_Uncompress(const char* input, size_t length,
char* output) {
#ifdef SNAPPY
return snappy::RawUncompress(input, length, output);
#else
return false;
#endif
}
inline bool Zlib_Compress(const CompressionOptions& opts, const char* input,
size_t length, ::std::string* output) {
#ifdef ZLIB
// The memLevel parameter specifies how much memory should be allocated for
// the internal compression state.
// memLevel=1 uses minimum memory but is slow and reduces compression ratio.
// memLevel=9 uses maximum memory for optimal speed.
// The default value is 8. See zconf.h for more details.
static const int memLevel = 8;
z_stream _stream;
memset(&_stream, 0, sizeof(z_stream));
int st = deflateInit2(&_stream, opts.level, Z_DEFLATED, opts.window_bits,
memLevel, opts.strategy);
if (st != Z_OK) {
return false;
}
// Resize output to be the plain data length.
// This may not be big enough if the compression actually expands data.
output->resize(length);
// Compress the input, and put compressed data in output.
_stream.next_in = (Bytef *)input;
_stream.avail_in = length;
// Initialize the output size.
_stream.avail_out = length;
_stream.next_out = (Bytef *)&(*output)[0];
int old_sz =0, new_sz =0, new_sz_delta =0;
bool done = false;
while (!done) {
int st = deflate(&_stream, Z_FINISH);
switch (st) {
case Z_STREAM_END:
done = true;
break;
case Z_OK:
// No output space. Increase the output space by 20%.
// (Should we fail the compression since it expands the size?)
old_sz = output->size();
new_sz_delta = (int)(output->size() * 0.2);
new_sz = output->size() + (new_sz_delta < 10 ? 10 : new_sz_delta);
output->resize(new_sz);
// Set more output.
_stream.next_out = (Bytef *)&(*output)[old_sz];
_stream.avail_out = new_sz - old_sz;
break;
case Z_BUF_ERROR:
default:
deflateEnd(&_stream);
return false;
}
}
output->resize(output->size() - _stream.avail_out);
deflateEnd(&_stream);
return true;
#endif
return false;
}
inline char* Zlib_Uncompress(const char* input_data, size_t input_length,
int* decompress_size, int windowBits = -14) {
#ifdef ZLIB
z_stream _stream;
memset(&_stream, 0, sizeof(z_stream));
// For raw inflate, the windowBits should be -8..-15.
// If windowBits is bigger than zero, it will use either zlib
// header or gzip header. Adding 32 to it will do automatic detection.
int st = inflateInit2(&_stream,
windowBits > 0 ? windowBits + 32 : windowBits);
if (st != Z_OK) {
return nullptr;
}
_stream.next_in = (Bytef *)input_data;
_stream.avail_in = input_length;
// Assume the decompressed data size will 5x of compressed size.
int output_len = input_length * 5;
char* output = new char[output_len];
int old_sz = output_len;
_stream.next_out = (Bytef *)output;
_stream.avail_out = output_len;
char* tmp = nullptr;
int output_len_delta;
bool done = false;
//while(_stream.next_in != nullptr && _stream.avail_in != 0) {
while (!done) {
int st = inflate(&_stream, Z_SYNC_FLUSH);
switch (st) {
case Z_STREAM_END:
done = true;
break;
case Z_OK:
// No output space. Increase the output space by 20%.
old_sz = output_len;
output_len_delta = (int)(output_len * 0.2);
output_len += output_len_delta < 10 ? 10 : output_len_delta;
tmp = new char[output_len];
memcpy(tmp, output, old_sz);
delete[] output;
output = tmp;
// Set more output.
_stream.next_out = (Bytef *)(output + old_sz);
_stream.avail_out = output_len - old_sz;
break;
case Z_BUF_ERROR:
default:
delete[] output;
inflateEnd(&_stream);
return nullptr;
}
}
*decompress_size = output_len - _stream.avail_out;
inflateEnd(&_stream);
return output;
#endif
return nullptr;
}
inline bool BZip2_Compress(const CompressionOptions& opts, const char* input,
size_t length, ::std::string* output) {
#ifdef BZIP2
bz_stream _stream;
memset(&_stream, 0, sizeof(bz_stream));
// Block size 1 is 100K.
// 0 is for silent.
// 30 is the default workFactor
int st = BZ2_bzCompressInit(&_stream, 1, 0, 30);
if (st != BZ_OK) {
return false;
}
// Resize output to be the plain data length.
// This may not be big enough if the compression actually expands data.
output->resize(length);
// Compress the input, and put compressed data in output.
_stream.next_in = (char *)input;
_stream.avail_in = length;
// Initialize the output size.
_stream.next_out = (char *)&(*output)[0];
_stream.avail_out = length;
int old_sz =0, new_sz =0;
while(_stream.next_in != nullptr && _stream.avail_in != 0) {
int st = BZ2_bzCompress(&_stream, BZ_FINISH);
switch (st) {
case BZ_STREAM_END:
break;
case BZ_FINISH_OK:
// No output space. Increase the output space by 20%.
// (Should we fail the compression since it expands the size?)
old_sz = output->size();
new_sz = (int)(output->size() * 1.2);
output->resize(new_sz);
// Set more output.
_stream.next_out = (char *)&(*output)[old_sz];
_stream.avail_out = new_sz - old_sz;
break;
case BZ_SEQUENCE_ERROR:
default:
BZ2_bzCompressEnd(&_stream);
return false;
}
}
output->resize(output->size() - _stream.avail_out);
BZ2_bzCompressEnd(&_stream);
return true;
#endif
return false;
}
inline char* BZip2_Uncompress(const char* input_data, size_t input_length,
int* decompress_size) {
#ifdef BZIP2
bz_stream _stream;
memset(&_stream, 0, sizeof(bz_stream));
int st = BZ2_bzDecompressInit(&_stream, 0, 0);
if (st != BZ_OK) {
return nullptr;
}
_stream.next_in = (char *)input_data;
_stream.avail_in = input_length;
// Assume the decompressed data size will be 5x of compressed size.
int output_len = input_length * 5;
char* output = new char[output_len];
int old_sz = output_len;
_stream.next_out = (char *)output;
_stream.avail_out = output_len;
char* tmp = nullptr;
while(_stream.next_in != nullptr && _stream.avail_in != 0) {
int st = BZ2_bzDecompress(&_stream);
switch (st) {
case BZ_STREAM_END:
break;
case BZ_OK:
// No output space. Increase the output space by 20%.
old_sz = output_len;
output_len = (int)(output_len * 1.2);
tmp = new char[output_len];
memcpy(tmp, output, old_sz);
delete[] output;
output = tmp;
// Set more output.
_stream.next_out = (char *)(output + old_sz);
_stream.avail_out = output_len - old_sz;
break;
default:
delete[] output;
BZ2_bzDecompressEnd(&_stream);
return nullptr;
}
}
*decompress_size = output_len - _stream.avail_out;
BZ2_bzDecompressEnd(&_stream);
return output;
#endif
return nullptr;
}
inline bool LZ4_Compress(const CompressionOptions &opts, const char *input,
size_t length, ::std::string* output) {
#ifdef LZ4
int compressBound = LZ4_compressBound(length);
output->resize(8 + compressBound);
char *p = const_cast<char *>(output->c_str());
memcpy(p, &length, sizeof(length));
size_t outlen;
outlen = LZ4_compress_limitedOutput(input, p + 8, length, compressBound);
if (outlen == 0) {
return false;
}
output->resize(8 + outlen);
return true;
#endif
return false;
}
inline char* LZ4_Uncompress(const char* input_data, size_t input_length,
int* decompress_size) {
#ifdef LZ4
if (input_length < 8) {
return nullptr;
}
int output_len;
memcpy(&output_len, input_data, sizeof(output_len));
char *output = new char[output_len];
*decompress_size = LZ4_decompress_safe_partial(
input_data + 8, output, input_length - 8, output_len, output_len);
if (*decompress_size < 0) {
delete[] output;
return nullptr;
}
return output;
#endif
return nullptr;
}
inline bool LZ4HC_Compress(const CompressionOptions &opts, const char* input,
size_t length, ::std::string* output) {
#ifdef LZ4
int compressBound = LZ4_compressBound(length);
output->resize(8 + compressBound);
char *p = const_cast<char *>(output->c_str());
memcpy(p, &length, sizeof(length));
size_t outlen;
#ifdef LZ4_VERSION_MAJOR // they only started defining this since r113
outlen = LZ4_compressHC2_limitedOutput(input, p + 8, length, compressBound,
opts.level);
#else
outlen = LZ4_compressHC_limitedOutput(input, p + 8, length, compressBound);
#endif
if (outlen == 0) {
return false;
}
output->resize(8 + outlen);
return true;
#endif
return false;
}
#define CACHE_LINE_SIZE 64U
#ifdef min
#undef min
#endif
#ifdef max
#undef max
#endif
// For Thread Local Storage abstraction
typedef DWORD pthread_key_t;
inline
int pthread_key_create(pthread_key_t *key, void(*destructor)(void*)) {
// Not used
(void)destructor;
pthread_key_t k = TlsAlloc();
if (TLS_OUT_OF_INDEXES == k) {
return ENOMEM;
}
*key = k;
return 0;
}
inline
int pthread_key_delete(pthread_key_t key) {
if (!TlsFree(key)) {
return EINVAL;
}
return 0;
}
inline
int pthread_setspecific(pthread_key_t key, const void *value) {
if (!TlsSetValue(key, const_cast<void*>(value))) {
return ENOMEM;
}
return 0;
}
inline
void* pthread_getspecific(pthread_key_t key) {
void* result = TlsGetValue(key);
if (!result) {
if (GetLastError() != ERROR_SUCCESS) {
errno = EINVAL;
} else {
errno = NOERROR;
}
}
return result;
}
// UNIX equiv although errno numbers will be off
// using C-runtime to implement. Note, this does not
// feel space with zeros in case the file is extended.
int truncate(const char* path, int64_t length);
} // namespace port
using port::pthread_key_t;
using port::pthread_key_create;
using port::pthread_key_delete;
using port::pthread_setspecific;
using port::pthread_getspecific;
using port::truncate;
} // namespace rocksdb
#endif // STORAGE_LEVELDB_PORT_PORT_POSIX_H_