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rocksdb/util/random.cc

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1006 B

// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
#include "util/random.h"
#include <pthread.h>
#include <stdint.h>
#include <string.h>
#include "port/likely.h"
#include "util/thread_local.h"
#if ROCKSDB_SUPPORT_THREAD_LOCAL
#define STORAGE_DECL static __thread
#else
#define STORAGE_DECL static
#endif
namespace rocksdb {
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)) {
const pthread_t self = pthread_self();
uint32_t seed = 0;
memcpy(&seed, &self, sizeof(seed));
rv = new (&tls_instance_bytes) Random(seed);
tls_instance = rv;
}
return rv;
}
} // namespace rocksdb