heyongqiang
12 years ago
parent
6fee5a74f5
commit
a4f9b8b49e
@ -1,64 +0,0 @@ |
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// 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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#include "port/port_android.h" |
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#include <cstdlib> |
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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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return fread(a, b, c, d); |
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} |
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size_t fwrite_unlocked(const void *a, size_t b, size_t c, FILE *d) { |
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return fwrite(a, b, c, d); |
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} |
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int fflush_unlocked(FILE *f) { |
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return fflush(f); |
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} |
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int fdatasync(int fd) { |
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return fsync(fd); |
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} |
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} |
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namespace leveldb { |
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namespace port { |
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static void PthreadCall(const char* label, int result) { |
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if (result != 0) { |
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fprintf(stderr, "pthread %s: %s\n", label, strerror(result)); |
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abort(); |
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} |
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} |
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Mutex::Mutex() { PthreadCall("init mutex", pthread_mutex_init(&mu_, NULL)); } |
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Mutex::~Mutex() { PthreadCall("destroy mutex", pthread_mutex_destroy(&mu_)); } |
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void Mutex::Lock() { PthreadCall("lock", pthread_mutex_lock(&mu_)); } |
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void Mutex::Unlock() { PthreadCall("unlock", pthread_mutex_unlock(&mu_)); } |
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CondVar::CondVar(Mutex* mu) |
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: mu_(mu) { |
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PthreadCall("init cv", pthread_cond_init(&cv_, NULL)); |
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} |
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CondVar::~CondVar() {
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PthreadCall("destroy cv", pthread_cond_destroy(&cv_)); |
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} |
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void CondVar::Wait() { |
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PthreadCall("wait", pthread_cond_wait(&cv_, &mu_->mu_)); |
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} |
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void CondVar::Signal(){ |
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PthreadCall("signal", pthread_cond_signal(&cv_)); |
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} |
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void CondVar::SignalAll() { |
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PthreadCall("broadcast", pthread_cond_broadcast(&cv_)); |
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} |
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} // namespace port
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} // namespace leveldb
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@ -1,180 +0,0 @@ |
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// 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 <unistd.h> |
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#include <string> |
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#include <cctype> |
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// Collapse the plethora of ARM flavors available to an easier to manage set
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// Defs reference is at https://wiki.edubuntu.org/ARM/Thumb2PortingHowto
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#if defined(__ARM_ARCH_6__) || \ |
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defined(__ARM_ARCH_6J__) || \
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defined(__ARM_ARCH_6K__) || \
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defined(__ARM_ARCH_6Z__) || \
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defined(__ARM_ARCH_6T2__) || \
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defined(__ARM_ARCH_6ZK__) || \
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defined(__ARM_ARCH_7__) || \
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defined(__ARM_ARCH_7R__) || \
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defined(__ARM_ARCH_7A__) |
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#define ARMV6_OR_7 1 |
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#endif |
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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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#ifndef ARMV6_OR_7 |
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// On ARM chipsets <V6, 0xffff0fa0 is the hard coded address of a
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// memory barrier function provided by the kernel.
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typedef void (*LinuxKernelMemoryBarrierFunc)(void); |
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// TODO(user): ATTRIBUTE_WEAK is undefined, so this fails to build on
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// non-ARMV6_OR_7. We may be able to replace it with __attribute__((weak)) for
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// older ARM builds, but x86 builds will require a different memory barrier.
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LinuxKernelMemoryBarrierFunc pLinuxKernelMemoryBarrier ATTRIBUTE_WEAK = |
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(LinuxKernelMemoryBarrierFunc) 0xffff0fa0; |
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#endif |
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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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void* rep_; |
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inline void MemoryBarrier() const { |
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// TODO(gabor): This only works on Android instruction sets >= V6
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#ifdef ARMV6_OR_7 |
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__asm__ __volatile__("dmb" : : : "memory"); |
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#else |
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pLinuxKernelMemoryBarrier(); |
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#endif |
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} |
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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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void* r = rep_; |
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MemoryBarrier(); |
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return r; |
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} |
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inline void Release_Store(void* v) { |
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MemoryBarrier(); |
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rep_ = v; |
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} |
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inline void* NoBarrier_Load() const { |
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void* r = rep_; |
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return r; |
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} |
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inline void NoBarrier_Store(void* v) { |
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rep_ = v; |
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} |
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}; |
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// TODO(gabor): Implement compress
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inline bool Snappy_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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return false; |
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} |
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// TODO(gabor): Implement uncompress
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inline bool Snappy_GetUncompressedLength(const char* input, size_t length, |
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size_t* result) { |
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return false; |
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} |
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// TODO(gabor): Implement uncompress
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inline bool Snappy_Uncompress( |
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const char* input_data, |
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size_t input_length, |
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char* output) { |
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return false; |
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} |
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inline bool Zlib_Compress(const char* input, size_t length, |
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::std::string* output, int windowBits = 15, int level = -1, |
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int strategy = 0) { |
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return false; |
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} |
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inline char* Zlib_Uncompress(const char* input_data, size_t input_length, |
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int* decompress_size, int windowBits = 15) { |
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return false; |
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} |
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inline bool BZip2_Compress(const char* input, size_t length, |
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::std::string* output) { |
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return false; |
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} |
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inline char* BZip2_Uncompress( const char* input_data, size_t input_length, |
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int* decompress_size) { |
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return false; |
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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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} // namespace port
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_PORT_PORT_ANDROID_H_
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