Remove unused code from EventSource (#22853)

FallbackActivityId is theoretically references in CoreFX but it's under never defined FEATURE_ACTIVITYSAMPLING
and the implementation should live in CoreFX part anyway

3 files changed, 0 insertions, 37 deletions

diff --git a/src/System.Private.CoreLib/System.Private.CoreLib.csproj b/src/System.Private.CoreLib/System.Private.CoreLib.csproj
index afcfcf763f..df8bd2ac0b 100644
--- a/src/System.Private.CoreLib/System.Private.CoreLib.csproj
+++ b/src/System.Private.CoreLib/System.Private.CoreLib.csproj
@@ -269,7 +269,6 @@
     <Compile Include="$(BclSourcesRoot)\System\WeakReference.cs" />
     <Compile Include="$(BclSourcesRoot)\System\WeakReferenceOfT.cs" />
     <Compile Include="shared\Interop\Windows\Kernel32\Interop.GetCurrentProcessId.cs" />
-    <Compile Include="shared\Interop\Windows\Kernel32\Interop.GetCurrentThreadId.cs" />
     <Compile Include="shared\Interop\Windows\Kernel32\Interop.GetStdHandle.cs" />
     <Compile Include="shared\Interop\Windows\Kernel32\Interop.LocalAlloc.cs" />
     <Compile Include="shared\Interop\Windows\Kernel32\Interop.QueryUnbiasedInterruptTime.cs" />
diff --git a/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/EventSource.cs b/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/EventSource.cs
index fc5b26c32e..1f98dd55aa 100644
--- a/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/EventSource.cs
+++ b/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/EventSource.cs
@@ -434,39 +434,6 @@ namespace System.Diagnostics.Tracing
             eventSource.SendCommand(null, EventProviderType.ETW, 0, 0, command, true, EventLevel.LogAlways, EventKeywords.None, commandArguments);
         }
 
-#if !ES_BUILD_STANDALONE
-        /// <summary>
-        /// This property allows EventSource code to appropriately handle as "different" 
-        /// activities started on different threads that have not had an activity created on them.
-        /// </summary>
-        internal static Guid InternalCurrentThreadActivityId
-        {
-            get
-            {
-                Guid retval = CurrentThreadActivityId;
-                if (retval == Guid.Empty)
-                {
-                    retval = FallbackActivityId;
-                }
-                return retval;
-            }
-        }
-
-        internal static Guid FallbackActivityId
-        {
-            get
-            {
-                int threadID = Interop.Kernel32.GetCurrentThreadId();
-
-                // Managed thread IDs are more aggressively re-used than native thread IDs,
-                // so we'll use the latter...
-                return new Guid(unchecked((uint)threadID),
-                                unchecked((ushort)s_currentPid), unchecked((ushort)(s_currentPid >> 16)),
-                                0x94, 0x1b, 0x87, 0xd5, 0xa6, 0x5c, 0x36, 0x64);
-            }
-        }
-#endif // !ES_BUILD_STANDALONE
-
         // Error APIs.  (We don't throw by default, but you can probe for status)
         /// <summary>
         /// Because
diff --git a/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/StubEnvironment.cs b/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/StubEnvironment.cs
index 1ca8dd06a8..c62b517906 100644
--- a/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/StubEnvironment.cs
+++ b/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/StubEnvironment.cs
@@ -344,9 +344,6 @@ internal static partial class Interop
     internal static partial class Kernel32
     {
         [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
-        public static extern int GetCurrentThreadId();
-
-        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
         internal static extern uint GetCurrentProcessId();
     }
 }