rocksdb/port/port_android.h
jorlow@chromium.org 8303bb1b33 Pull from upstream.
git-svn-id: https://leveldb.googlecode.com/svn/trunk@14 62dab493-f737-651d-591e-8d6aee1b9529
2011-03-22 23:24:02 +00:00

123 lines
2.7 KiB
C++

// 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_ANDROID_H_
#define STORAGE_LEVELDB_PORT_PORT_ANDROID_H_
#include <endian.h>
#include <pthread.h>
#include <stdint.h>
#include <sha1.h>
#include <cstdatomic>
#include <string>
#include <cctype>
extern "C" {
size_t fread_unlocked(void *a, size_t b, size_t c, FILE *d);
size_t fwrite_unlocked(const void *a, size_t b, size_t c, FILE *d);
int fflush_unlocked(FILE *f);
int fdatasync (int fd);
}
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() {
//TODO(gabor): How can I implement this?
}
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:
Mutex* mu_;
pthread_cond_t cv_;
};
// 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);
}
};
// TODO(gabor): Implement actual compress
inline bool Snappy_Compress(
const char* input,
size_t input_length,
std::string* output) {
return false;
}
// TODO(gabor): Implement actual uncompress
inline bool Snappy_Uncompress(
const char* input_data,
size_t input_length,
std::string* output) {
return false;
}
inline void SHA1_Hash(const char* data, size_t len, char* hash_array) {
SHA1_CTX sha1_ctx;
SHA1Init(&sha1_ctx);
SHA1Update(&sha1_ctx, (const u_char*)data, len);
SHA1Final((u_char*)hash_array, &sha1_ctx);
}
inline uint64_t ThreadIdentifier() {
pthread_t tid = pthread_self();
uint64_t r = 0;
memcpy(&r, &tid, sizeof(r) < sizeof(tid) ? sizeof(r) : sizeof(tid));
return r;
}
inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) {
return false;
}
}
}
#endif // STORAGE_LEVELDB_PORT_PORT_ANDROID_H_