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RocksDB for Erlang

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rocksdb deps rocksdb util random.cc
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deps/rocksdb/util/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 {



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