258 lines
10 KiB
Plaintext
258 lines
10 KiB
Plaintext
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="HLSFAllocator.BucketNode.cs"
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// Project: StgSharp
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// AuthorGroup: Nitload Space
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// Copyright (c) Nitload Space. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the “Software”), to deal in the Software without restriction,
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// including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software,
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// and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and
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// this permission notice shall be included in all copies
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// or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED “AS IS”,
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// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH
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// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// -----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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using System;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Threading;
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namespace StgSharp.HighPerformance.Memory
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{
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public unsafe partial class HybridLayerSegregatedFitAllocator
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{
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private static void AcquireBucketNodeSpinLock(BucketNode* node)
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{
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int thread = Environment.CurrentManagedThreadId;
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if (node != null && Volatile.Read(ref node->SpinLock) != thread)
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{
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while (Interlocked.CompareExchange(ref node->SpinLock, thread, 0) != 0) {
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Thread.Sleep(0);
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}
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}
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}
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/// <summary>
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/// Initialize bucket system (called in constructor)
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/// </summary>
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private void InitializeBucketSystem()
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{
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_bucketHeads = new ulong[levelSize.Length * 3];
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}
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private void PushLevel(int levelIndex, int sizeIndex, BucketNode* node)
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{
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if (node == null || node->EntryRef == null) {
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return;
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}
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int index = (3 * levelIndex) + sizeIndex;
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if (Interlocked.CompareExchange(ref _bucketHeads[index], (nuint)node, EmptyHandle) == EmptyHandle)
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{
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node->IsInBucket = true;
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node->Magic = BucketNode.MAGIC_NUMBER;
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return;
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} else
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{
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while (true)
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{
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AcquireBucketNodeSpinLock(node);
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ulong head = Volatile.Read(ref _bucketHeads[index]);
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node->NextLevel = head;
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BucketNode* headNode = (BucketNode*)head;
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try
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{
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if (Interlocked.CompareExchange(ref _bucketHeads[index], (nuint)node, head) == head)
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{
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if (!TryAcquireBucketNodeSpinLock(headNode))
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{
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// reset state and retry
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_ = Interlocked.CompareExchange(ref _bucketHeads[index], head, (nuint)node);
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Thread.Sleep(0);
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continue;
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}
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try
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{
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node->IsInBucket = true;
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node->Magic = BucketNode.MAGIC_NUMBER;
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headNode->PreviousLevel = (ulong)node;
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return;
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}
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finally
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{
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ReleaseBucketNodeSpinLock(headNode);
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}
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} else
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{
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Thread.Sleep(0);
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continue;
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}
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}
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finally
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{
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ReleaseBucketNodeSpinLock(node);
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}
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}
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}
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}
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private static void ReleaseBucketNodeSpinLock(BucketNode* node)
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{
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int thread = Environment.CurrentManagedThreadId;
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if (node != null && Volatile.Read(ref node->SpinLock) != 0) {
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_ = Interlocked.CompareExchange(ref node->SpinLock, 0, thread);
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}
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}
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private void RemoveFromBucket(int levelIndex, int sizeIndex, BucketNode* node)
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{
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int index = (3 * levelIndex) + sizeIndex;
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while (true)
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{
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// top of stack
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if ((BucketNode*)Volatile.Read(ref _bucketHeads[index]) == node && TryAcquireBucketNodeSpinLock(node))
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{
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_ = TryPopLevel(levelIndex, sizeIndex, out _);
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} else
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{
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AcquireBucketNodeSpinLock(node);
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ulong p = Volatile.Read(ref node->PreviousLevel), n = Volatile.Read(ref node->NextLevel);
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BucketNode* previous = (BucketNode*)p, next = (BucketNode*)n;
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try
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{
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if (next is null)
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{
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// bottom of stack
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if (!TryAcquireBucketNodeSpinLock(previous))
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{
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Thread.Sleep(0);
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continue;
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}
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previous->NextLevel = EmptyHandle;
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node->PreviousLevel = EmptyHandle;
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return;
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}
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if (!(TryAcquireBucketNodeSpinLock(previous) && TryAcquireBucketNodeSpinLock(next)))
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{
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// middle of stack
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Thread.Sleep(0);
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continue;
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}
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previous ->NextLevel = n;
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next->PreviousLevel = p;
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node->NextLevel = EmptyHandle;
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node->PreviousLevel = EmptyHandle;
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return;
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}
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finally
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{
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ReleaseBucketNodeSpinLock(node);
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ReleaseBucketNodeSpinLock(previous);
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ReleaseBucketNodeSpinLock(next);
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}
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}
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}
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}
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private static bool TryAcquireBucketNodeSpinLock(BucketNode* node)
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{
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int thread = Environment.CurrentManagedThreadId;
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return node == null ||
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(Interlocked.CompareExchange(ref node->SpinLock, thread,
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0) == 0 ||
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Volatile.Read(ref node->SpinLock) == thread);
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}
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private bool TryPopLevel(int levelIndex, int sizeIndex, out BucketNode* node)
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{
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int index = (3 * levelIndex) + sizeIndex;
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while (true)
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{
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ulong h = Volatile.Read(ref _bucketHeads[index]);
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BucketNode* head = (BucketNode*)h;
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BucketNode* next = null;
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try
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{
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if (head == null)
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{
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node = null;
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return false;
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}
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if (!TryAcquireBucketNodeSpinLock(head))
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{
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Thread.Sleep(0);
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continue;
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}
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ulong n = Volatile.Read(ref head->NextLevel);
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next = (BucketNode*)n;
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if (!TryAcquireBucketNodeSpinLock(next))
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{
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Thread.Sleep(0);
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continue;
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}
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if (Interlocked.CompareExchange(ref _bucketHeads[index], head->NextLevel, h) == h)
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{
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node = head;
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node->IsInBucket = false;
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node->NextLevel = EmptyHandle;
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next->PreviousLevel = EmptyHandle;
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return true;
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} else
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{
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Thread.Sleep(0);
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continue;
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}
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}
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finally
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{
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ReleaseBucketNodeSpinLock(head);
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ReleaseBucketNodeSpinLock(next);
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}
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}
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}
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/// <summary>
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/// BucketNode structure - specialized node for bucket linked lists Stored in main
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/// allocation area (user-overwritable region)
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/// </summary>
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[StructLayout(LayoutKind.Explicit, Size = 36)]
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internal struct BucketNode
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{
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public const uint MAGIC_NUMBER = 0xBEEFCAFE; // Magic number for node integrity verification
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[FieldOffset(16)] internal Entry* EntryRef; // Pointer to corresponding Entry
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[FieldOffset(28)] internal bool IsInBucket; // Whether in bucket
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[FieldOffset(32)] internal int SpinLock; // Spin lock for bucket head operation
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[FieldOffset(24)] internal uint Magic; // Magic number verification
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[FieldOffset(0)] internal ulong NextLevel; // Bucket stack linked list: next pointer
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[FieldOffset(8)] internal ulong PreviousLevel; // Bucket stack linked list: previous pointer
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static bool IsNullOrEmpty(BucketNode* node)
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{
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return node == null || node->Magic != MAGIC_NUMBER;
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}
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}
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}
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}
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