Nelze vybrat více než 25 témat
Téma musí začínat písmenem nebo číslem, může obsahovat pomlčky („-“) a může být dlouhé až 35 znaků.
125 řádky
2.6 KiB
125 řádky
2.6 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_OSX_H_
|
|
#define STORAGE_LEVELDB_PORT_PORT_OSX_H_
|
|
|
|
#include <libkern/OSAtomic.h>
|
|
#include <machine/endian.h>
|
|
#include <pthread.h>
|
|
#include <stdint.h>
|
|
|
|
#include <string>
|
|
|
|
namespace leveldb {
|
|
|
|
// The following 4 methods implemented here for the benefit of env_posix.cc.
|
|
inline size_t fread_unlocked(void *a, size_t b, size_t c, FILE *d) {
|
|
return fread(a, b, c, d);
|
|
}
|
|
|
|
inline size_t fwrite_unlocked(const void *a, size_t b, size_t c, FILE *d) {
|
|
return fwrite(a, b, c, d);
|
|
}
|
|
|
|
inline int fflush_unlocked(FILE *f) {
|
|
return fflush(f);
|
|
}
|
|
|
|
inline int fdatasync(int fd) {
|
|
return fsync(fd);
|
|
}
|
|
|
|
namespace port {
|
|
|
|
static const bool kLittleEndian = (__DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN);
|
|
|
|
// ------------------ Threading -------------------
|
|
|
|
// A Mutex represents an exclusive lock.
|
|
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_;
|
|
};
|
|
|
|
inline void MemoryBarrier() {
|
|
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
|
|
// See http://gcc.gnu.org/ml/gcc/2003-04/msg01180.html for a discussion on
|
|
// this idiom. Also see http://en.wikipedia.org/wiki/Memory_ordering.
|
|
__asm__ __volatile__("" : : : "memory");
|
|
#else
|
|
OSMemoryBarrier();
|
|
#endif
|
|
}
|
|
|
|
class AtomicPointer {
|
|
private:
|
|
void* ptr_;
|
|
public:
|
|
AtomicPointer() { }
|
|
explicit AtomicPointer(void* p) : ptr_(p) {}
|
|
inline void* Acquire_Load() const {
|
|
void* ptr = ptr_;
|
|
MemoryBarrier();
|
|
return ptr;
|
|
}
|
|
inline void Release_Store(void* v) {
|
|
MemoryBarrier();
|
|
ptr_ = v;
|
|
}
|
|
inline void* NoBarrier_Load() const {
|
|
return ptr_;
|
|
}
|
|
inline void NoBarrier_Store(void* v) {
|
|
ptr_ = v;
|
|
}
|
|
};
|
|
|
|
inline bool Snappy_Compress(const char* input, size_t input_length,
|
|
std::string* output) {
|
|
return false;
|
|
}
|
|
|
|
inline bool Snappy_Uncompress(const char* input_data, size_t input_length,
|
|
std::string* output) {
|
|
return false;
|
|
}
|
|
|
|
inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) {
|
|
return false;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
#endif // STORAGE_LEVELDB_PORT_PORT_OSX_H_
|