69 lines
1.4 KiB
C#
69 lines
1.4 KiB
C#
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namespace System.Runtime.CompilerServices
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{
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struct Ephemeron
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{
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public object key;
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public object value;
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}
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//
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// Instead of dependent handles, mono uses arrays of Ephemeron objects.
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//
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struct DependentHandle
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{
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Ephemeron[] data;
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public DependentHandle (object primary, object secondary)
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{
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data = new Ephemeron [1];
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data [0].key = primary;
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data [0].value = secondary;
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GC.register_ephemeron_array (data);
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}
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public bool IsAllocated => data != null;
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// Getting the secondary object is more expensive than getting the first so
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// we provide a separate primary-only accessor for those times we only want the
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// primary.
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public object GetPrimary ()
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{
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if (!IsAllocated)
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throw new NotSupportedException ();
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if (data [0].key == GC.EPHEMERON_TOMBSTONE)
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return null;
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return data [0].key;
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}
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public object GetPrimaryAndSecondary (out object secondary)
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{
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if (!IsAllocated)
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throw new NotSupportedException ();
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if (data [0].key == GC.EPHEMERON_TOMBSTONE) {
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secondary = null;
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return null;
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}
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secondary = data [0].value;
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return data [0].key;
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}
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public void SetPrimary (object primary)
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{
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if (!IsAllocated)
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throw new NotSupportedException ();
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data [0].key = primary;
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}
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public void SetSecondary (object secondary)
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{
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if (!IsAllocated)
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throw new NotSupportedException ();
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data [0].value = secondary;
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}
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public void Free ()
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{
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data = null;
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}
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}
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}
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