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54 lines
1.6 KiB
C#
54 lines
1.6 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace ARMeilleure.Memory
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{
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class ReservedRegion
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{
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private const int DefaultGranularity = 65536; // Mapping granularity in Windows.
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public IntPtr Pointer { get; }
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private ulong _maxSize;
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private ulong _sizeGranularity;
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private ulong _currentSize;
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public ReservedRegion(ulong maxSize, ulong granularity = 0)
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{
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if (granularity == 0)
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{
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granularity = DefaultGranularity;
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}
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Pointer = MemoryManagement.Reserve(maxSize);
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_maxSize = maxSize;
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_sizeGranularity = granularity;
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_currentSize = 0;
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}
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public void ExpandIfNeeded(ulong desiredSize)
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{
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if (desiredSize > _maxSize)
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{
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throw new OutOfMemoryException();
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}
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if (desiredSize > _currentSize)
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{
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// Lock, and then check again. We only want to commit once.
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lock (this)
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{
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if (desiredSize >= _currentSize)
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{
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ulong overflowBytes = desiredSize - _currentSize;
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ulong moreToCommit = (((_sizeGranularity - 1) + overflowBytes) / _sizeGranularity) * _sizeGranularity; // Round up.
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MemoryManagement.Commit(new IntPtr((long)Pointer + (long)_currentSize), moreToCommit);
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_currentSize += moreToCommit;
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}
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}
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}
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}
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}
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}
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