mirror of https://github.com/facebook/rocksdb.git
42 lines
1.4 KiB
C++
42 lines
1.4 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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// This source code is also licensed under the GPLv2 license found in the
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// COPYING file in the root directory of this source tree.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "util/concurrent_arena.h"
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#include <thread>
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#include "port/likely.h"
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#include "port/port.h"
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#include "util/random.h"
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namespace rocksdb {
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#ifdef ROCKSDB_SUPPORT_THREAD_LOCAL
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__thread size_t ConcurrentArena::tls_cpuid = 0;
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#endif
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ConcurrentArena::ConcurrentArena(size_t block_size, size_t huge_page_size)
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: shard_block_size_(block_size / 8),
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shards_(),
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arena_(block_size, huge_page_size) {
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Fixup();
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}
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ConcurrentArena::Shard* ConcurrentArena::Repick() {
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auto shard_and_index = shards_.AccessElementAndIndex();
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#ifdef ROCKSDB_SUPPORT_THREAD_LOCAL
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// even if we are cpu 0, use a non-zero tls_cpuid so we can tell we
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// have repicked
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tls_cpuid = shard_and_index.second | shards_.Size();
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#endif
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return shard_and_index.first;
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}
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} // namespace rocksdb
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