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63 lines
1.7 KiB
63 lines
1.7 KiB
8 years ago
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/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. */
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#include "paddle/memory/detail/metadata.h"
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#include <functional>
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namespace paddle {
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namespace memory {
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namespace detail {
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Metadata::Metadata(MemoryBlock::Type t, size_t i, size_t s, size_t ts,
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MemoryBlock* l, MemoryBlock* r)
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: type(t),
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index(i),
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size(s),
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total_size(ts),
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left_buddy(l),
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right_buddy(r) {}
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template <class T>
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inline void hash_combine(std::size_t& seed, const T& v) {
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std::hash<T> hasher;
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seed ^= hasher(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
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}
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inline size_t hash(const Metadata* metadata, size_t initial_seed) {
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size_t seed = initial_seed;
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hash_combine(seed, (size_t)metadata->type);
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hash_combine(seed, metadata->index);
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hash_combine(seed, metadata->size);
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hash_combine(seed, metadata->total_size);
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hash_combine(seed, metadata->left_buddy);
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hash_combine(seed, metadata->right_buddy);
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return seed;
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}
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void Metadata::update_guards() {
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guard_begin = hash(this, 1);
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guard_end = hash(this, 2);
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}
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bool Metadata::check_guards() const {
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return guard_begin == hash(this, 1) && guard_end == hash(this, 2);
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}
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} // namespace detail
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} // namespace memory
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} // namespace paddle
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