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32 lines
1.4 KiB
C#
32 lines
1.4 KiB
C#
namespace Esiur.Protocol;
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/// <summary>
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/// Strategy used by <c>EpConnection.FetchResource</c> when it is asked for a resource whose
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/// attachment is already in flight. Selectable mainly for experimental A/B/C evaluation of the
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/// deadlock-prevention algorithm.
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/// </summary>
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public enum DeadlockResolutionMode : byte
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{
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/// <summary>
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/// Default. Wait for the in-flight attachment to complete, except when a genuine wait-for cycle
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/// is detected (same dependency chain, or a cross-chain cycle in the wait-for graph), in which
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/// case a placeholder is returned to break it. Never deadlocks and never returns an unnecessary
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/// placeholder.
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/// </summary>
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WaitWithCycleDetection = 0,
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/// <summary>
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/// Legacy behaviour: return the not-yet-attached placeholder to any cross-chain requester of an
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/// in-flight resource. Never deadlocks, but delivers partially-attached resources for non-cyclic
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/// contention (the bug under study).
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/// </summary>
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LegacyCrossChainPlaceholder = 1,
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/// <summary>
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/// No cycle handling at all: always wait for the in-flight attachment, even within the same
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/// dependency chain. Genuinely deadlocks whenever the request graph contains a cycle. Used only
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/// to demonstrate that cycle handling is necessary and that the deadlock detector works.
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/// </summary>
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NaiveWait = 2,
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}
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