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https://github.com/google/leveldb.git
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803d69203a
Changes are: * Update version number to 1.18 * Replace the basic fprintf call with a call to fwrite in order to work around the apparent compiler optimization/rewrite failure that we are seeing with the new toolchain/iOS SDKs provided with Xcode6 and iOS8. * Fix ALL the header guards. * Createed a README.md with the LevelDB project description. * A new CONTRIBUTING file. * Don't implicitly convert uint64_t to size_t or int. Either preserve it as uint64_t, or explicitly cast. This fixes MSVC warnings about possible value truncation when compiling this code in Chromium. * Added a DumpFile() library function that encapsulates the guts of the "leveldbutil dump" command. This will allow clients to dump data to their log files instead of stdout. It will also allow clients to supply their own environment. * leveldb: Remove unused function 'ConsumeChar'. * leveldbutil: Remove unused member variables from WriteBatchItemPrinter. * OpenBSD, NetBSD and DragonflyBSD have _LITTLE_ENDIAN, so define PLATFORM_IS_LITTLE_ENDIAN like on FreeBSD. This fixes: * issue #143 * issue #198 * issue #249 * Switch from <cstdatomic> to <atomic>. The former never made it into the standard and doesn't exist in modern gcc versions at all. The later contains everything that leveldb was using from the former. This problem was noticed when porting to Portable Native Client where no memory barrier is defined. The fact that <cstdatomic> is missing normally goes unnoticed since memory barriers are defined for most architectures. * Make Hash() treat its input as unsigned. Before this change LevelDB files from platforms with different signedness of char were not compatible. This change fixes: issue #243 * Verify checksums of index/meta/filter blocks when paranoid_checks set. * Invoke all tools for iOS with xcrun. (This was causing problems with the new XCode 5.1.1 image on pulse.) * include <sys/stat.h> only once, and fix the following linter warning: "Found C system header after C++ system header" * When encountering a corrupted table file, return Status::Corruption instead of Status::InvalidArgument. * Support cygwin as build platform, patch is from https://code.google.com/p/leveldb/issues/detail?id=188 * Fix typo, merge patch from https://code.google.com/p/leveldb/issues/detail?id=159 * Fix typos and comments, and address the following two issues: * issue #166 * issue #241 * Add missing db synchronize after "fillseq" in the benchmark. * Removed unused variable in SeekRandom: value (issue #201)
155 lines
4.0 KiB
C++
155 lines
4.0 KiB
C++
// 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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#undef PLATFORM_IS_LITTLE_ENDIAN
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#if defined(OS_MACOSX)
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#include <machine/endian.h>
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#if defined(__DARWIN_LITTLE_ENDIAN) && defined(__DARWIN_BYTE_ORDER)
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#define PLATFORM_IS_LITTLE_ENDIAN \
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(__DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN)
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#endif
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#elif defined(OS_SOLARIS)
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#include <sys/isa_defs.h>
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#ifdef _LITTLE_ENDIAN
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#define PLATFORM_IS_LITTLE_ENDIAN true
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#else
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#define PLATFORM_IS_LITTLE_ENDIAN false
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#endif
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#elif defined(OS_FREEBSD) || defined(OS_OPENBSD) ||\
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defined(OS_NETBSD) || defined(OS_DRAGONFLYBSD)
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#include <sys/types.h>
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#include <sys/endian.h>
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#define PLATFORM_IS_LITTLE_ENDIAN (_BYTE_ORDER == _LITTLE_ENDIAN)
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#elif defined(OS_HPUX)
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#define PLATFORM_IS_LITTLE_ENDIAN false
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#elif defined(OS_ANDROID)
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// Due to a bug in the NDK x86 <sys/endian.h> definition,
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// _BYTE_ORDER must be used instead of __BYTE_ORDER on Android.
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// See http://code.google.com/p/android/issues/detail?id=39824
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#include <endian.h>
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#define PLATFORM_IS_LITTLE_ENDIAN (_BYTE_ORDER == _LITTLE_ENDIAN)
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#else
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#include <endian.h>
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#endif
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#include <pthread.h>
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#ifdef SNAPPY
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#include <snappy.h>
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#endif
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#include <stdint.h>
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#include <string>
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#include "port/atomic_pointer.h"
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#ifndef PLATFORM_IS_LITTLE_ENDIAN
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#define PLATFORM_IS_LITTLE_ENDIAN (__BYTE_ORDER == __LITTLE_ENDIAN)
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#endif
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#if defined(OS_MACOSX) || defined(OS_SOLARIS) || defined(OS_FREEBSD) ||\
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defined(OS_NETBSD) || defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD) ||\
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defined(OS_ANDROID) || defined(OS_HPUX) || defined(CYGWIN)
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// Use fread/fwrite/fflush on platforms without _unlocked variants
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#define fread_unlocked fread
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#define fwrite_unlocked fwrite
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#define fflush_unlocked fflush
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#endif
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#if defined(OS_MACOSX) || defined(OS_FREEBSD) ||\
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defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD)
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// Use fsync() on platforms without fdatasync()
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#define fdatasync fsync
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#endif
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#if defined(OS_ANDROID) && __ANDROID_API__ < 9
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// fdatasync() was only introduced in API level 9 on Android. Use fsync()
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// when targetting older platforms.
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#define fdatasync fsync
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#endif
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namespace leveldb {
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namespace port {
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static const bool kLittleEndian = PLATFORM_IS_LITTLE_ENDIAN;
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#undef PLATFORM_IS_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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typedef pthread_once_t OnceType;
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#define LEVELDB_ONCE_INIT PTHREAD_ONCE_INIT
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extern void InitOnce(OnceType* once, void (*initializer)());
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inline bool Snappy_Compress(const char* input, size_t length,
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::std::string* output) {
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#ifdef SNAPPY
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output->resize(snappy::MaxCompressedLength(length));
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size_t outlen;
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snappy::RawCompress(input, length, &(*output)[0], &outlen);
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output->resize(outlen);
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return true;
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#endif
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return false;
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}
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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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#ifdef SNAPPY
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return snappy::GetUncompressedLength(input, length, result);
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#else
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return false;
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#endif
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}
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inline bool Snappy_Uncompress(const char* input, size_t length,
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char* output) {
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#ifdef SNAPPY
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return snappy::RawUncompress(input, length, output);
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#else
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return false;
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#endif
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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_POSIX_H_
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