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Kernel: Make Region single-owner instead of ref-counted
This simplifies the ownership model and makes Region easier to reason about. Userspace Regions are now primarily kept by Process::m_regions. Kernel Regions are kept in various OwnPtr<Regions>'s. Regions now only ever get unmapped when they are destroyed.
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9 changed files with 44 additions and 41 deletions
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@ -21,7 +21,7 @@ public:
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{
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auto region = MM.allocate_kernel_region(PAGE_ROUND_UP(size), "KBuffer", false, false);
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ASSERT(region);
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return adopt(*new KBufferImpl(*region, size));
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return adopt(*new KBufferImpl(region.release_nonnull(), size));
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}
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static NonnullRefPtr<KBufferImpl> copy(const void* data, size_t size)
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@ -43,14 +43,14 @@ public:
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}
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private:
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explicit KBufferImpl(NonnullRefPtr<Region>&& region, size_t size)
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explicit KBufferImpl(NonnullOwnPtr<Region>&& region, size_t size)
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: m_size(size)
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, m_region(move(region))
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{
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}
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size_t m_size { 0 };
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NonnullRefPtr<Region> m_region;
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NonnullOwnPtr<Region> m_region;
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};
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class KBuffer {
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