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Tip revision: 97bf78721b7d9c1fa25e6a9b38b693d45e85196d authored by Jay Zhuang on 14 October 2020, 00:46:31 UTC
Update HISTORY.md and version.h for 6.13.3
Update HISTORY.md and version.h for 6.13.3
Tip revision: 97bf787
random.cc
// 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;
}
} // namespace ROCKSDB_NAMESPACE