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Merge src/leveldb changes for LevelDB 1.18.

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This commit is contained in:
Pieter Wuille
2014-10-16 12:23:50 -07:00
parent e8f6d54f1f 4b0e2d75d7
commit 5b9f8425a5
40 changed files with 602 additions and 282 deletions
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21
src/leveldb/port/atomic_pointer.h
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@@ -5,14 +5,13 @@
// AtomicPointer provides storage for a lock-free pointer.
// Platform-dependent implementation of AtomicPointer:
// - If the platform provides a cheap barrier, we use it with raw pointers
// - If cstdatomic is present (on newer versions of gcc, it is), we use
// a cstdatomic-based AtomicPointer. However we prefer the memory
// - If <atomic> is present (on newer versions of gcc, it is), we use
// a <atomic>-based AtomicPointer. However we prefer the memory
// barrier based version, because at least on a gcc 4.4 32-bit build
// on linux, we have encountered a buggy <cstdatomic>
// implementation. Also, some <cstdatomic> implementations are much
// slower than a memory-barrier based implementation (~16ns for
// <cstdatomic> based acquire-load vs. ~1ns for a barrier based
// acquire-load).
// on linux, we have encountered a buggy <atomic> implementation.
// Also, some <atomic> implementations are much slower than a memory-barrier
// based implementation (~16ns for <atomic> based acquire-load vs. ~1ns for
// a barrier based acquire-load).
// This code is based on atomicops-internals-* in Google's perftools:
// http://code.google.com/p/google-perftools/source/browse/#svn%2Ftrunk%2Fsrc%2Fbase
@@ -20,8 +19,8 @@
#define PORT_ATOMIC_POINTER_H_
#include <stdint.h>
#ifdef LEVELDB_CSTDATOMIC_PRESENT
#include <cstdatomic>
#ifdef LEVELDB_ATOMIC_PRESENT
#include <atomic>
#endif
#ifdef OS_WIN
#include <windows.h>
@@ -126,7 +125,7 @@ class AtomicPointer {
};
// AtomicPointer based on <cstdatomic>
#elif defined(LEVELDB_CSTDATOMIC_PRESENT)
#elif defined(LEVELDB_ATOMIC_PRESENT)
class AtomicPointer {
private:
std::atomic<void*> rep_;
@@ -207,7 +206,7 @@ class AtomicPointer {
inline void NoBarrier_Store(void* v) { rep_ = v; }
};
// We have neither MemoryBarrier(), nor <cstdatomic>
// We have neither MemoryBarrier(), nor <atomic>
#else
#error Please implement AtomicPointer for this platform.

9
src/leveldb/port/port_posix.h
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@@ -21,14 +21,11 @@
#else
#define PLATFORM_IS_LITTLE_ENDIAN false
#endif
#elif defined(OS_FREEBSD)
#elif defined(OS_FREEBSD) || defined(OS_OPENBSD) ||\
defined(OS_NETBSD) || defined(OS_DRAGONFLYBSD)
#include <sys/types.h>
#include <sys/endian.h>
#define PLATFORM_IS_LITTLE_ENDIAN (_BYTE_ORDER == _LITTLE_ENDIAN)
#elif defined(OS_OPENBSD) || defined(OS_NETBSD) ||\
defined(OS_DRAGONFLYBSD)
#include <sys/types.h>
#include <sys/endian.h>
#elif defined(OS_HPUX)
#define PLATFORM_IS_LITTLE_ENDIAN false
#elif defined(OS_ANDROID)
@@ -55,7 +52,7 @@
#if defined(OS_MACOSX) || defined(OS_SOLARIS) || defined(OS_FREEBSD) ||\
defined(OS_NETBSD) || defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD) ||\
defined(OS_ANDROID) || defined(OS_HPUX)
defined(OS_ANDROID) || defined(OS_HPUX) || defined(CYGWIN)
// Use fread/fwrite/fflush on platforms without _unlocked variants
#define fread_unlocked fread
#define fwrite_unlocked fwrite

5
src/leveldb/port/thread_annotations.h
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@@ -2,7 +2,8 @@
// 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.
#ifndef STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H
#ifndef STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H_
#define STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H_
// Some environments provide custom macros to aid in static thread-safety
// analysis. Provide empty definitions of such macros unless they are already
@@ -56,4 +57,4 @@
#define NO_THREAD_SAFETY_ANALYSIS
#endif
#endif // STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H
#endif // STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H_