fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
38 lines
995 B
38 lines
995 B
// 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;
|
|
}
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|
|
|