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47 lines
1.3 KiB
47 lines
1.3 KiB
5 years ago
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// Needed for NET40
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#if !NET_4_6
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using System;
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using System.Collections.Generic;
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using LinqInternal.Threading;
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namespace LinqInternal.Collections.ThreadSafe
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{
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internal static class ReentryGuardHelper
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{
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[ThreadStatic]
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private static HashSet<RuntimeUniqueIdProdiver.UniqueId> _guard;
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public static bool Enter(RuntimeUniqueIdProdiver.UniqueId id)
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{
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// Assume anything could have been set to null, start no sync operation, this could be running during DomainUnload
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var guard = _guard;
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if (guard == null)
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{
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_guard = new HashSet<RuntimeUniqueIdProdiver.UniqueId> { id };
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return true;
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}
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if (!guard.Contains(id))
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{
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guard.Add(id);
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return true;
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}
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return false;
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}
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public static bool IsTaken(RuntimeUniqueIdProdiver.UniqueId id)
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{
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return _guard.Contains(id);
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}
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public static void Leave(RuntimeUniqueIdProdiver.UniqueId id)
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{
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// Assume anything could have been set to null, start no sync operation, this could be running during DomainUnload
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var guard = _guard;
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if (guard != null)
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{
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guard.Remove(id);
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}
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}
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}
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}
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#endif
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