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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/stllike/hash_set.h>
#include <cstddef>
#include <cstdint>
#include <limits>
#include <map>
#include <set>
namespace vespalib::alloc {
/*
* Class that tracks free areas in a file.
*/
class FileAreaFreeList {
std::map<uint64_t, size_t> _free_areas; // map from offset to size
std::map<size_t, std::set<uint64_t>> _free_sizes; // map from size to set of offsets
vespalib::hash_set<uint64_t> _fences;
void remove_from_size_set(uint64_t offset, size_t size);
std::pair<uint64_t, size_t> prepare_reuse_area(size_t size);
public:
FileAreaFreeList();
~FileAreaFreeList();
uint64_t alloc(size_t size);
void free(uint64_t offset, size_t size);
void add_premmapped_area(uint64_t offset, size_t size);
void remove_premmapped_area(uint64_t offset, size_t size);
static constexpr uint64_t bad_offset = std::numeric_limits<uint64_t>::max();
};
}
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