Nie możesz wybrać więcej, niż 25 tematów
Tematy muszą się zaczynać od litery lub cyfry, mogą zawierać myślniki ('-') i mogą mieć do 35 znaków.
108 wiersze
2.5 KiB
108 wiersze
2.5 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_
|
|
|
|
#include <endian.h>
|
|
#include <pthread.h>
|
|
#include <stdint.h>
|
|
#include <string>
|
|
#include <cstdatomic>
|
|
#include <cstring>
|
|
#include "port/sha1_portable.h"
|
|
|
|
namespace leveldb {
|
|
namespace port {
|
|
|
|
static const bool kLittleEndian = (__BYTE_ORDER == __LITTLE_ENDIAN);
|
|
|
|
class CondVar;
|
|
|
|
class Mutex {
|
|
public:
|
|
Mutex();
|
|
~Mutex();
|
|
|
|
void Lock();
|
|
void Unlock();
|
|
void AssertHeld() { }
|
|
|
|
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_;
|
|
};
|
|
|
|
// Storage for a lock-free pointer
|
|
class AtomicPointer {
|
|
private:
|
|
std::atomic<void*> rep_;
|
|
public:
|
|
AtomicPointer() { }
|
|
explicit AtomicPointer(void* v) : rep_(v) { }
|
|
inline void* Acquire_Load() const {
|
|
return rep_.load(std::memory_order_acquire);
|
|
}
|
|
inline void Release_Store(void* v) {
|
|
rep_.store(v, std::memory_order_release);
|
|
}
|
|
inline void* NoBarrier_Load() const {
|
|
return rep_.load(std::memory_order_relaxed);
|
|
}
|
|
inline void NoBarrier_Store(void* v) {
|
|
rep_.store(v, std::memory_order_relaxed);
|
|
}
|
|
};
|
|
|
|
inline void SHA1_Hash(const char* data, size_t len, char* hash_array) {
|
|
SHA1_Hash_Portable(data, len, hash_array);
|
|
}
|
|
|
|
/**
|
|
* TODO(gabor): Implement actual compress
|
|
* This is a hack - it just copies input to output.
|
|
* No actual compression occurs.
|
|
*/
|
|
inline void Lightweight_Compress(const char* input, size_t input_length,
|
|
std::string* output) {
|
|
output->assign(input, input_length);
|
|
}
|
|
|
|
/**
|
|
* TODO(gabor): Implement actual uncompress
|
|
* This is a hack - it just copies input to output.
|
|
* No actual uncompression occurs.
|
|
*/
|
|
inline bool Lightweight_Uncompress(const char* input_data, size_t input_length,
|
|
std::string* output) {
|
|
output->assign(input_data, input_length);
|
|
return true;
|
|
}
|
|
|
|
inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) {
|
|
return false;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
#endif // STORAGE_LEVELDB_PORT_PORT_POSIX_H_
|