mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-26 16:30:56 +00:00
154 lines
3.9 KiB
C++
154 lines
3.9 KiB
C++
// 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.
|
|
|
|
#pragma once
|
|
|
|
// 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 "zu"
|
|
|
|
#undef PLATFORM_IS_LITTLE_ENDIAN
|
|
#if defined(OS_MACOSX)
|
|
#include <machine/endian.h>
|
|
#if defined(__DARWIN_LITTLE_ENDIAN) && defined(__DARWIN_BYTE_ORDER)
|
|
#define PLATFORM_IS_LITTLE_ENDIAN \
|
|
(__DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN)
|
|
#endif
|
|
#elif defined(OS_SOLARIS)
|
|
#include <sys/isa_defs.h>
|
|
#ifdef _LITTLE_ENDIAN
|
|
#define PLATFORM_IS_LITTLE_ENDIAN true
|
|
#else
|
|
#define PLATFORM_IS_LITTLE_ENDIAN false
|
|
#endif
|
|
#elif defined(OS_FREEBSD)
|
|
#include <sys/endian.h>
|
|
#include <sys/types.h>
|
|
#define PLATFORM_IS_LITTLE_ENDIAN (_BYTE_ORDER == _LITTLE_ENDIAN)
|
|
#elif defined(OS_OPENBSD) || defined(OS_NETBSD) ||\
|
|
defined(OS_DRAGONFLYBSD) || defined(OS_ANDROID)
|
|
#include <sys/types.h>
|
|
#include <sys/endian.h>
|
|
#else
|
|
#include <endian.h>
|
|
#endif
|
|
#include <pthread.h>
|
|
|
|
#include <stdint.h>
|
|
#include <string>
|
|
#include <string.h>
|
|
|
|
#ifndef PLATFORM_IS_LITTLE_ENDIAN
|
|
#define PLATFORM_IS_LITTLE_ENDIAN (__BYTE_ORDER == __LITTLE_ENDIAN)
|
|
#endif
|
|
|
|
#if defined(OS_MACOSX) || defined(OS_SOLARIS) || defined(OS_FREEBSD) ||\
|
|
defined(OS_NETBSD) || defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD) ||\
|
|
defined(OS_ANDROID)
|
|
// Use fread/fwrite/fflush on platforms without _unlocked variants
|
|
#define fread_unlocked fread
|
|
#define fwrite_unlocked fwrite
|
|
#define fflush_unlocked fflush
|
|
#endif
|
|
|
|
#if defined(OS_MACOSX) || defined(OS_FREEBSD) ||\
|
|
defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD)
|
|
// Use fsync() on platforms without fdatasync()
|
|
#define fdatasync fsync
|
|
#endif
|
|
|
|
#if defined(OS_ANDROID) && __ANDROID_API__ < 9
|
|
// fdatasync() was only introduced in API level 9 on Android. Use fsync()
|
|
// when targetting older platforms.
|
|
#define fdatasync fsync
|
|
#endif
|
|
|
|
#include <limits>
|
|
|
|
namespace rocksdb {
|
|
namespace port {
|
|
|
|
// For use at db/file_indexer.h kLevelMaxIndex
|
|
const int LevelMaxIndex = std::numeric_limits<int32_t>::max();
|
|
|
|
static const bool kLittleEndian = PLATFORM_IS_LITTLE_ENDIAN;
|
|
#undef PLATFORM_IS_LITTLE_ENDIAN
|
|
|
|
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();
|
|
|
|
private:
|
|
friend class CondVar;
|
|
pthread_mutex_t mu_;
|
|
#ifndef NDEBUG
|
|
bool locked_;
|
|
#endif
|
|
|
|
// No copying
|
|
Mutex(const Mutex&);
|
|
void operator=(const Mutex&);
|
|
};
|
|
|
|
class RWMutex {
|
|
public:
|
|
RWMutex();
|
|
~RWMutex();
|
|
|
|
void ReadLock();
|
|
void WriteLock();
|
|
void ReadUnlock();
|
|
void WriteUnlock();
|
|
void AssertHeld() { }
|
|
|
|
private:
|
|
pthread_rwlock_t mu_; // the underlying platform mutex
|
|
|
|
// No copying allowed
|
|
RWMutex(const RWMutex&);
|
|
void operator=(const RWMutex&);
|
|
};
|
|
|
|
class CondVar {
|
|
public:
|
|
explicit CondVar(Mutex* mu);
|
|
~CondVar();
|
|
void Wait();
|
|
// Timed condition wait. Returns true if timeout occurred.
|
|
bool TimedWait(uint64_t abs_time_us);
|
|
void Signal();
|
|
void SignalAll();
|
|
private:
|
|
pthread_cond_t cv_;
|
|
Mutex* mu_;
|
|
};
|
|
|
|
typedef pthread_once_t OnceType;
|
|
#define LEVELDB_ONCE_INIT PTHREAD_ONCE_INIT
|
|
extern void InitOnce(OnceType* once, void (*initializer)());
|
|
|
|
#define CACHE_LINE_SIZE 64U
|
|
|
|
#define PREFETCH(addr, rw, locality) __builtin_prefetch(addr, rw, locality)
|
|
|
|
} // namespace port
|
|
} // namespace rocksdb
|
|
|