mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-30 04:41:49 +00:00
a79b46c503
Summary: The functions will be used for remote compaction parameter input and result. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8247 Test Plan: `make check` Reviewed By: ajkr Differential Revision: D28104680 Pulled By: jay-zhuang fbshipit-source-id: c0a5178e6277125118384278efea2acbf90aa6cb
66 lines
1.5 KiB
C++
66 lines
1.5 KiB
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).
|
|
//
|
|
|
|
#include "util/random.h"
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <thread>
|
|
#include <utility>
|
|
|
|
#include "port/likely.h"
|
|
#include "util/thread_local.h"
|
|
|
|
#ifdef ROCKSDB_SUPPORT_THREAD_LOCAL
|
|
#define STORAGE_DECL static __thread
|
|
#else
|
|
#define STORAGE_DECL static
|
|
#endif
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
Random* Random::GetTLSInstance() {
|
|
STORAGE_DECL Random* tls_instance;
|
|
STORAGE_DECL std::aligned_storage<sizeof(Random)>::type tls_instance_bytes;
|
|
|
|
auto rv = tls_instance;
|
|
if (UNLIKELY(rv == nullptr)) {
|
|
size_t seed = std::hash<std::thread::id>()(std::this_thread::get_id());
|
|
rv = new (&tls_instance_bytes) Random((uint32_t)seed);
|
|
tls_instance = rv;
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
std::string Random::HumanReadableString(int len) {
|
|
std::string ret;
|
|
ret.resize(len);
|
|
for (int i = 0; i < len; ++i) {
|
|
ret[i] = static_cast<char>('a' + Uniform(26));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
std::string Random::RandomString(int len) {
|
|
std::string ret;
|
|
ret.resize(len);
|
|
for (int i = 0; i < len; i++) {
|
|
ret[i] = static_cast<char>(' ' + Uniform(95)); // ' ' .. '~'
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
std::string Random::RandomBinaryString(int len) {
|
|
std::string ret;
|
|
ret.resize(len);
|
|
for (int i = 0; i < len; i++) {
|
|
ret[i] = static_cast<char>(Uniform(CHAR_MAX));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|