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157 行
4.1 KiB
157 行
4.1 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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#undef PLATFORM_IS_LITTLE_ENDIAN
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#if defined(__APPLE__)
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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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#if HAVE_CRC32C
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#include <crc32c/crc32c.h>
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#endif // HAVE_CRC32C
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#if HAVE_SNAPPY
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#include <snappy.h>
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#endif // HAVE_SNAPPY
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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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#include "port/thread_annotations.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(__APPLE__) || 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 LOCKABLE Mutex {
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public:
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Mutex();
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~Mutex();
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void Lock() EXCLUSIVE_LOCK_FUNCTION();
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void Unlock() UNLOCK_FUNCTION();
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void AssertHeld() ASSERT_EXCLUSIVE_LOCK() { }
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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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#if HAVE_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 // HAVE_SNAPPY
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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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#if HAVE_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 // HAVE_SNAPPY
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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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#if HAVE_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 // HAVE_SNAPPY
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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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inline uint32_t AcceleratedCRC32C(uint32_t crc, const char* buf, size_t size) {
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#if HAVE_CRC32C
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return ::crc32c::Extend(crc, reinterpret_cast<const uint8_t*>(buf), size);
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#else
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return 0;
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#endif // HAVE_CRC32C
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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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