You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
130 lines
3.1 KiB
130 lines
3.1 KiB
// 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_POSIX_H_
|
|
#define STORAGE_LEVELDB_PORT_PORT_POSIX_H_
|
|
|
|
// port/port_config.h availability is automatically detected via __has_include
|
|
// in newer compilers. If LEVELDB_HAS_PORT_CONFIG_H is defined, it overrides the
|
|
// configuration detection.
|
|
#if defined(LEVELDB_HAS_PORT_CONFIG_H)
|
|
|
|
#if LEVELDB_HAS_PORT_CONFIG_H
|
|
#include "port/port_config.h"
|
|
#endif // LEVELDB_HAS_PORT_CONFIG_H
|
|
|
|
#elif defined(__has_include)
|
|
|
|
#if __has_include("port/port_config.h")
|
|
#include "port/port_config.h"
|
|
#endif // __has_include("port/port_config.h")
|
|
|
|
#endif // defined(LEVELDB_HAS_PORT_CONFIG_H)
|
|
|
|
#include <pthread.h>
|
|
#if HAVE_CRC32C
|
|
#include <crc32c/crc32c.h>
|
|
#endif // HAVE_CRC32C
|
|
#if HAVE_SNAPPY
|
|
#include <snappy.h>
|
|
#endif // HAVE_SNAPPY
|
|
#include <stdint.h>
|
|
#include <string>
|
|
#include "port/atomic_pointer.h"
|
|
#include "port/thread_annotations.h"
|
|
|
|
#if !HAVE_FDATASYNC
|
|
#define fdatasync fsync
|
|
#endif // !HAVE_FDATASYNC
|
|
|
|
namespace leveldb {
|
|
namespace port {
|
|
|
|
static const bool kLittleEndian = !LEVELDB_IS_BIG_ENDIAN;
|
|
|
|
class CondVar;
|
|
|
|
class LOCKABLE Mutex {
|
|
public:
|
|
Mutex();
|
|
~Mutex();
|
|
|
|
void Lock() EXCLUSIVE_LOCK_FUNCTION();
|
|
void Unlock() UNLOCK_FUNCTION();
|
|
void AssertHeld() ASSERT_EXCLUSIVE_LOCK() { }
|
|
|
|
private:
|
|
friend class CondVar;
|
|
pthread_mutex_t mu_;
|
|
|
|
// No copying
|
|
Mutex(const Mutex&);
|
|
void operator=(const Mutex&);
|
|
};
|
|
|
|
class CondVar {
|
|
public:
|
|
explicit CondVar(Mutex* mu);
|
|
~CondVar();
|
|
void Wait();
|
|
void Signal();
|
|
void SignalAll();
|
|
private:
|
|
pthread_cond_t cv_;
|
|
Mutex* mu_;
|
|
};
|
|
|
|
typedef pthread_once_t OnceType;
|
|
#define LEVELDB_ONCE_INIT PTHREAD_ONCE_INIT
|
|
void InitOnce(OnceType* once, void (*initializer)());
|
|
|
|
inline bool Snappy_Compress(const char* input, size_t length,
|
|
::std::string* output) {
|
|
#if HAVE_SNAPPY
|
|
output->resize(snappy::MaxCompressedLength(length));
|
|
size_t outlen;
|
|
snappy::RawCompress(input, length, &(*output)[0], &outlen);
|
|
output->resize(outlen);
|
|
return true;
|
|
#endif // HAVE_SNAPPY
|
|
|
|
return false;
|
|
}
|
|
|
|
inline bool Snappy_GetUncompressedLength(const char* input, size_t length,
|
|
size_t* result) {
|
|
#if HAVE_SNAPPY
|
|
return snappy::GetUncompressedLength(input, length, result);
|
|
#else
|
|
return false;
|
|
#endif // HAVE_SNAPPY
|
|
}
|
|
|
|
inline bool Snappy_Uncompress(const char* input, size_t length,
|
|
char* output) {
|
|
#if HAVE_SNAPPY
|
|
return snappy::RawUncompress(input, length, output);
|
|
#else
|
|
return false;
|
|
#endif // HAVE_SNAPPY
|
|
}
|
|
|
|
inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) {
|
|
return false;
|
|
}
|
|
|
|
inline uint32_t AcceleratedCRC32C(uint32_t crc, const char* buf, size_t size) {
|
|
#if HAVE_CRC32C
|
|
return ::crc32c::Extend(crc, reinterpret_cast<const uint8_t*>(buf), size);
|
|
#else
|
|
return 0;
|
|
#endif // HAVE_CRC32C
|
|
}
|
|
|
|
} // namespace port
|
|
} // namespace leveldb
|
|
|
|
#endif // STORAGE_LEVELDB_PORT_PORT_POSIX_H_
|