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9fd58fd6d8
Also generate a new random ID on collision, instead of using the old ID + 1. :^) SonarCloud: https://sonarcloud.io/project/security_hotspots?id=SerenityOS_serenity&hotspots=AXuVPBMNk92xXUF3qWZd
46 lines
925 B
C++
46 lines
925 B
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Forward.h>
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#include <AK/HashTable.h>
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#include <AK/Random.h>
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namespace AK {
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// This class manages a pool of random ID's in the range 1..INT32_MAX
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class IDAllocator {
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public:
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IDAllocator() = default;
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~IDAllocator() = default;
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int allocate()
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{
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VERIFY(m_allocated_ids.size() < (INT32_MAX - 2));
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int id = 0;
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for (;;) {
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id = static_cast<int>(get_random_uniform(NumericLimits<int>::max()));
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if (id == 0)
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continue;
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if (m_allocated_ids.set(id) == AK::HashSetResult::InsertedNewEntry)
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break;
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}
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return id;
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}
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void deallocate(int id)
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{
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m_allocated_ids.remove(id);
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}
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private:
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HashTable<int> m_allocated_ids;
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};
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}
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using AK::IDAllocator;
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