mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-30 13:41:46 +00:00
4e60663b31
Summary: In C++, `extern` is redundant in a number of cases: * "Global" function declarations and definitions * "Global" variable definitions when already declared `extern` For consistency and simplicity, I've removed these in code that *we own*. In a couple of cases, I removed obsolete declarations, and for MagicNumber constants, I have consolidated the declarations into a header file (format.h) as standard best practice would prescribe. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12300 Test Plan: no functional changes, CI Reviewed By: ajkr Differential Revision: D53148629 Pulled By: pdillinger fbshipit-source-id: fb8d927959892e03af09b0c0d542b0a3b38fd886
24 lines
829 B
C++
24 lines
829 B
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under both the GPLv2 (found in the
|
|
// COPYING file in the root directory) and Apache 2.0 License
|
|
// (found in the LICENSE.Apache file in the root directory).
|
|
//
|
|
#pragma once
|
|
#include "db/version_edit.h"
|
|
#include "util/random.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
static const uint32_t kFileReadSampleRate = 1024;
|
|
bool should_sample_file_read();
|
|
void sample_file_read_inc(FileMetaData*);
|
|
|
|
inline bool should_sample_file_read() {
|
|
return (Random::GetTLSInstance()->Next() % kFileReadSampleRate == 307);
|
|
}
|
|
|
|
inline void sample_file_read_inc(FileMetaData* meta) {
|
|
meta->stats.num_reads_sampled.fetch_add(kFileReadSampleRate,
|
|
std::memory_order_relaxed);
|
|
}
|
|
} // namespace ROCKSDB_NAMESPACE
|