blob: 07fa03cf784bdc4eb6ec741c47a172e75debc2df [file] [log] [blame]
// 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).
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "util/concurrent_arena.h"
#include <thread>
#include "port/port.h"
#include "util/random.h"
namespace rocksdb {
__thread size_t ConcurrentArena::tls_cpuid = 0;
ConcurrentArena::ConcurrentArena(size_t block_size, AllocTracker* tracker,
size_t huge_page_size)
: shard_block_size_(block_size / 8),
arena_(block_size, tracker, huge_page_size) {
ConcurrentArena::Shard* ConcurrentArena::Repick() {
auto shard_and_index = shards_.AccessElementAndIndex();
// even if we are cpu 0, use a non-zero tls_cpuid so we can tell we
// have repicked
tls_cpuid = shard_and_index.second | shards_.Size();
return shard_and_index.first;
} // namespace rocksdb