public unsafe void VirtualMemory_Decommit()
{
BaselibErrorState errorState = default;
// Reserve 4GB
var addressSpace = VirtualMemoryUtility.ReserveAddressSpace(1024ul * 1024ul, VirtualMemoryUtility.DefaultPageSizeInBytes, out errorState);
{
// Commit 4KB for an allocator
VMRange page = new VMRange {
ptr = addressSpace.ptr, log2PageSize = addressSpace.log2PageSize, pageCount = 1
};
VirtualMemoryUtility.CommitMemory(page, out errorState);
var allocator = new UnsafeScratchAllocator((void *)page.ptr, 4096);
var numbers0 = (int *)allocator.Allocate <int>(256);
for (int i = 0; i < 256; i++)
{
numbers0[i] = i;
}
// Decommit and try to use
VirtualMemoryUtility.DecommitMemory(page, out errorState);
Assert.Throws <NullReferenceException>(() => numbers0[1] = 1);
}
VirtualMemoryUtility.FreeAddressSpace(addressSpace, out errorState);
}
public void Execute(int index)
{
BaselibErrorState errorState = default;
VMRange addressRange = new VMRange {
ptr = jobAddressRangePtr + index, log2PageSize = jobLog2PageSize, pageCount = jobPageCount
};
VirtualMemoryUtility.DecommitMemory(addressRange, out errorState);
jobErrorStates[index] = errorState;
}
/// <summary>
/// Frees the buffer represented by the given index.
/// </summary>
/// <param name="index">Index to buffer.</param>
/// <exception cref="ArgumentException">Thrown when index is less than zero or when greater than or equal to BufferCapacity</exception>
/// <exception cref="InvalidOperationException">Thrown if the buffer cannot be decommitted.</exception>
public void Free(int index)
{
#if ENABLE_UNITY_COLLECTIONS_CHECKS
if (index < 0 || index >= BufferCapacity)
{
throw new ArgumentException($"Cannot free index {index}, it is outside the expected range [0, {BufferCapacity}).");
}
#endif
BaselibErrorState errorState;
var range = new VMRange((IntPtr)this[index], (uint)BufferSizeInBytes, VirtualMemoryUtility.DefaultPageSizeInBytes);
VirtualMemoryUtility.DecommitMemory(range, out errorState);
if (!errorState.Success)
{
#if ENABLE_UNITY_COLLECTIONS_CHECKS
throw new InvalidOperationException($"Failed to decommit address range {range}.");
#endif
}
FreeList.Add(index);
}
