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131 rader
3.0 KiB
131 rader
3.0 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_ANDROID_H_
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#define STORAGE_LEVELDB_PORT_PORT_ANDROID_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 <sha1.h>
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#include <cstdatomic>
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#include <string>
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#include <cctype>
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extern "C" {
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size_t fread_unlocked(void *a, size_t b, size_t c, FILE *d);
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size_t fwrite_unlocked(const void *a, size_t b, size_t c, FILE *d);
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int fflush_unlocked(FILE *f);
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int fdatasync (int fd);
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}
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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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//TODO(gabor): How can I implement this?
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}
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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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Mutex* mu_;
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pthread_cond_t cv_;
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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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/**
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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(
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const char* input,
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size_t input_length,
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std::string* output) {
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output->copy((char*)input,0,input_length);
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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 uncompression occurs.
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*/
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inline bool Lightweight_Uncompress(
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const char* input_data,
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size_t input_length,
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std::string* output) {
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output->copy((char*)input_data,0,input_length);
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return (bool)1;
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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_CTX sha1_ctx;
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SHA1Init(&sha1_ctx);
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SHA1Update(&sha1_ctx, (const u_char*)data, len);
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SHA1Final((u_char*)hash_array, &sha1_ctx);
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}
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inline uint64_t ThreadIdentifier() {
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pthread_t tid = pthread_self();
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uint64_t r = 0;
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memcpy(&r, &tid, sizeof(r) < sizeof(tid) ? sizeof(r) : sizeof(tid));
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return r;
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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_ANDROID_H_
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