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Diffstat (limited to 'src/leveldb/port/port_posix.h')
-rw-r--r-- | src/leveldb/port/port_posix.h | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/src/leveldb/port/port_posix.h b/src/leveldb/port/port_posix.h new file mode 100644 index 0000000000..654a4b9d3d --- /dev/null +++ b/src/leveldb/port/port_posix.h @@ -0,0 +1,144 @@ +// 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_POSIX_H_ +#define STORAGE_LEVELDB_PORT_PORT_POSIX_H_ + +#undef PLATFORM_IS_LITTLE_ENDIAN +#if defined(OS_MACOSX) + #include <machine/endian.h> + #if defined(__DARWIN_LITTLE_ENDIAN) && defined(__DARWIN_BYTE_ORDER) + #define PLATFORM_IS_LITTLE_ENDIAN \ + (__DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN) + #endif +#elif defined(OS_SOLARIS) + #include <sys/isa_defs.h> + #ifdef _LITTLE_ENDIAN + #define PLATFORM_IS_LITTLE_ENDIAN true + #else + #define PLATFORM_IS_LITTLE_ENDIAN false + #endif +#elif defined(OS_FREEBSD) || defined(OS_OPENBSD) || defined(OS_NETBSD) ||\ + defined(OS_DRAGONFLYBSD) || defined(OS_ANDROID) + #include <sys/types.h> + #include <sys/endian.h> +#else + #include <endian.h> +#endif +#include <pthread.h> +#ifdef SNAPPY +#include <snappy.h> +#endif +#include <stdint.h> +#include <string> +#include "port/atomic_pointer.h" + +#ifndef PLATFORM_IS_LITTLE_ENDIAN +#define PLATFORM_IS_LITTLE_ENDIAN (__BYTE_ORDER == __LITTLE_ENDIAN) +#endif + +#if defined(OS_MACOSX) || defined(OS_SOLARIS) || defined(OS_FREEBSD) ||\ + defined(OS_NETBSD) || defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD) ||\ + defined(OS_ANDROID) +// Use fread/fwrite/fflush on platforms without _unlocked variants +#define fread_unlocked fread +#define fwrite_unlocked fwrite +#define fflush_unlocked fflush +#endif + +#if defined(OS_MACOSX) || defined(OS_FREEBSD) ||\ + defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD) +// Use fsync() on platforms without fdatasync() +#define fdatasync fsync +#endif + +#if defined(OS_ANDROID) && __ANDROID_API__ < 9 +// fdatasync() was only introduced in API level 9 on Android. Use fsync() +// when targetting older platforms. +#define fdatasync fsync +#endif + +namespace leveldb { +namespace port { + +static const bool kLittleEndian = PLATFORM_IS_LITTLE_ENDIAN; +#undef PLATFORM_IS_LITTLE_ENDIAN + +class CondVar; + +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_; +}; + +typedef pthread_once_t OnceType; +#define LEVELDB_ONCE_INIT PTHREAD_ONCE_INIT +extern void InitOnce(OnceType* once, void (*initializer)()); + +inline bool Snappy_Compress(const char* input, size_t length, + ::std::string* output) { +#ifdef SNAPPY + output->resize(snappy::MaxCompressedLength(length)); + size_t outlen; + snappy::RawCompress(input, length, &(*output)[0], &outlen); + output->resize(outlen); + return true; +#endif + + return false; +} + +inline bool Snappy_GetUncompressedLength(const char* input, size_t length, + size_t* result) { +#ifdef SNAPPY + return snappy::GetUncompressedLength(input, length, result); +#else + return false; +#endif +} + +inline bool Snappy_Uncompress(const char* input, size_t length, + char* output) { +#ifdef SNAPPY + return snappy::RawUncompress(input, length, output); +#else + return false; +#endif +} + +inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) { + return false; +} + +} // namespace port +} // namespace leveldb + +#endif // STORAGE_LEVELDB_PORT_PORT_POSIX_H_ |