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108 líneas
2.5 KiB
108 líneas
2.5 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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//
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// See port_example.h for documentation for the following types/functions.
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#ifndef STORAGE_LEVELDB_PORT_PORT_POSIX_H_
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#define STORAGE_LEVELDB_PORT_PORT_POSIX_H_
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#include <endian.h>
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#include <pthread.h>
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#include <stdint.h>
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#include <string>
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#include <cstdatomic>
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#include <cstring>
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#include "port/sha1_portable.h"
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namespace leveldb {
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namespace port {
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static const bool kLittleEndian = (__BYTE_ORDER == __LITTLE_ENDIAN);
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class CondVar;
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class Mutex {
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public:
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Mutex();
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~Mutex();
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void Lock();
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void Unlock();
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void AssertHeld() { }
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private:
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friend class CondVar;
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pthread_mutex_t mu_;
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// No copying
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Mutex(const Mutex&);
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void operator=(const Mutex&);
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};
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class CondVar {
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public:
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explicit CondVar(Mutex* mu);
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~CondVar();
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void Wait();
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void Signal();
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void SignalAll();
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private:
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pthread_cond_t cv_;
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Mutex* mu_;
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};
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// Storage for a lock-free pointer
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class AtomicPointer {
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private:
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std::atomic<void*> rep_;
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public:
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AtomicPointer() { }
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explicit AtomicPointer(void* v) : rep_(v) { }
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inline void* Acquire_Load() const {
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return rep_.load(std::memory_order_acquire);
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}
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inline void Release_Store(void* v) {
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rep_.store(v, std::memory_order_release);
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}
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inline void* NoBarrier_Load() const {
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return rep_.load(std::memory_order_relaxed);
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}
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inline void NoBarrier_Store(void* v) {
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rep_.store(v, std::memory_order_relaxed);
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}
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};
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inline void SHA1_Hash(const char* data, size_t len, char* hash_array) {
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SHA1_Hash_Portable(data, len, hash_array);
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}
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/**
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* TODO(gabor): Implement actual compress
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* This is a hack - it just copies input to output.
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* No actual compression occurs.
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*/
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inline void Lightweight_Compress(const char* input, size_t input_length,
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std::string* output) {
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output->assign(input, input_length);
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}
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/**
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* TODO(gabor): Implement actual uncompress
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* This is a hack - it just copies input to output.
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* No actual uncompression occurs.
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*/
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inline bool Lightweight_Uncompress(const char* input_data, size_t input_length,
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std::string* output) {
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output->assign(input_data, input_length);
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return true;
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}
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inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) {
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return false;
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}
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}
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}
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#endif // STORAGE_LEVELDB_PORT_PORT_POSIX_H_
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