Lockfree Priority Queue

PriorityQueueとは？ ,[object Object],[object Object],[object Object]

Lockfree PriorityQueueとは ,[object Object],[object Object]

構造 ,[object Object],[object Object],[object Object],0 0 0 0 0 0 0 1 2 3 4 5 6 7 8 アイテムを保持 Atomicに操作できるカウンタ

挿入 ,[object Object],[object Object],[object Object],0 0 0 0 0 0 0 1 2 3 4 5 6 7 8

挿入 ,[object Object],[object Object],[object Object],1 0 0 0 0 1 0 1 2 3 4 5 6 7 8 完了！

挿入操作同士の干渉 ,[object Object],[object Object],[object Object],1 0 0 0 0 1 0 1 2 3 4 5 6 7 8

取り出し ,[object Object],[object Object],[object Object],2 1 1 0 0 1 0 1 2 3 4 5 6 7 8

取り出し ,[object Object],[object Object],[object Object],[object Object],2 1 1 0 0 1 0 1 2 3 4 5 6 7 8

取り出し ,[object Object],[object Object],[object Object],[object Object],1 0 1 0 0 1 0 1 2 3 4 5 6 7 8 発見！

取り出し操作同士の干渉 ,[object Object],[object Object],1 0 1 0 0 1 0 1 2 3 4 5 6 7 8

取り出しと挿入の衝突 ,[object Object],1 0 1 0 0 1 0 1 2 3 4 5 6 7 8

取り出しと挿入の衝突 ,[object Object],0 0 1 0 0 1 1 1 2 3 4 5 6 7 8 inc dec

取り出しと挿入の衝突 ,[object Object],0 1 1 0 0 1 1 1 2 3 4 5 6 7 8 inc

取り出しと挿入の衝突 ,[object Object],[object Object],1 0 1 0 0 1 1 1 2 3 4 5 6 7 8 inc dec

取り出しと挿入の衝突 ,[object Object],[object Object],[object Object],1 0 1 0 0 1 0 1 2 3 4 5 6 7 8 dec

実装 ,[object Object],[object Object],[object Object],h[1] h[2] h[3] h[7] h[6] h[5] h[4] X[0] X[1] X[2] X[3] X[4] X[5] X[6] X[7]

実装（挿入処理） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

実装（取り出し処理） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],案外簡単！

まとめ ,[object Object],[object Object],[object Object],[object Object]

Lockfree Priority Queue

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Lockfree Priority Queue