summaryrefslogtreecommitdiff
path: root/src/mscorlib/shared/System/Diagnostics/Tracing/TraceLogging/NameInfo.cs
diff options
context:
space:
mode:
Diffstat (limited to 'src/mscorlib/shared/System/Diagnostics/Tracing/TraceLogging/NameInfo.cs')
-rw-r--r--src/mscorlib/shared/System/Diagnostics/Tracing/TraceLogging/NameInfo.cs79
1 files changed, 79 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/Diagnostics/Tracing/TraceLogging/NameInfo.cs b/src/mscorlib/shared/System/Diagnostics/Tracing/TraceLogging/NameInfo.cs
new file mode 100644
index 0000000000..668043ae68
--- /dev/null
+++ b/src/mscorlib/shared/System/Diagnostics/Tracing/TraceLogging/NameInfo.cs
@@ -0,0 +1,79 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using Interlocked = System.Threading.Interlocked;
+
+#if ES_BUILD_STANDALONE
+namespace Microsoft.Diagnostics.Tracing
+#else
+namespace System.Diagnostics.Tracing
+#endif
+{
+ /// <summary>
+ /// TraceLogging: Stores the metadata and event identifier corresponding
+ /// to a tracelogging event type+name+tags combination.
+ /// </summary>
+ internal sealed class NameInfo
+ : ConcurrentSetItem<KeyValuePair<string, EventTags>, NameInfo>
+ {
+ /// <summary>
+ /// Insure that eventIds strictly less than 'eventId' will not be
+ /// used by the SelfDescribing events.
+ /// </summary>
+ internal static void ReserveEventIDsBelow(int eventId)
+ {
+ for(;;)
+ {
+ int snapshot = lastIdentity;
+ int newIdentity = (lastIdentity & ~0xFFFFFF) + eventId;
+ newIdentity = Math.Max(newIdentity, snapshot); // Should be redundant. as we only create descriptors once.
+ if (Interlocked.CompareExchange(ref lastIdentity, newIdentity, snapshot) == snapshot)
+ break;
+ }
+ }
+
+ private static int lastIdentity = Statics.TraceLoggingChannel << 24;
+ internal readonly string name;
+ internal readonly EventTags tags;
+ internal readonly int identity;
+ internal readonly byte[] nameMetadata;
+
+ public NameInfo(string name, EventTags tags, int typeMetadataSize)
+ {
+ this.name = name;
+ this.tags = tags & Statics.EventTagsMask;
+ this.identity = Interlocked.Increment(ref lastIdentity);
+
+ int tagsPos = 0;
+ Statics.EncodeTags((int)this.tags, ref tagsPos, null);
+
+ this.nameMetadata = Statics.MetadataForString(name, tagsPos, 0, typeMetadataSize);
+
+ tagsPos = 2;
+ Statics.EncodeTags((int)this.tags, ref tagsPos, this.nameMetadata);
+ }
+
+ public override int Compare(NameInfo other)
+ {
+ return this.Compare(other.name, other.tags);
+ }
+
+ public override int Compare(KeyValuePair<string, EventTags> key)
+ {
+ return this.Compare(key.Key, key.Value & Statics.EventTagsMask);
+ }
+
+ private int Compare(string otherName, EventTags otherTags)
+ {
+ int result = StringComparer.Ordinal.Compare(this.name, otherName);
+ if (result == 0 && this.tags != otherTags)
+ {
+ result = this.tags < otherTags ? -1 : 1;
+ }
+ return result;
+ }
+ }
+}