bug fix

.vscode/settings.json

@@ -2,6 +2,7 @@
     "cSpell.words": [
         "Cloudtoid",
         "Diagnoser",
+        "finalizer",
         "Interprocess",
         "Kaby",
         "Onnx",

src/Interprocess/Queue/Subscriber.cs

@@ -127,7 +127,7 @@ private unsafe bool TryDequeueImpl(
             var readOffset = Header->ReadOffset;
             var messageHeader = (MessageHeader*)Buffer.GetPointer(readOffset);
 
-            // was this message fully written by the publisher? if not, wait for the publisher to finish writting it
+            // was this message fully written by the publisher? if not, wait for the publisher to finish writing it
             while (Interlocked.CompareExchange(
                 ref messageHeader->State,
                 MessageHeader.LockedToBeConsumedState,

src/Interprocess/Semaphore/MacOS/Interop.cs

@@ -96,10 +96,10 @@ internal static bool Wait(IntPtr handle, int millisecondsTimeout)
         }
         else
         {
-            var start = DateTime.Now;
+            var stopwatch = ValueStopwatch.StartNew();
             while (!TryWait(handle))
             {
-                if ((DateTime.Now - start).Milliseconds > millisecondsTimeout)
+                if (stopwatch.GetElapsedTime().TotalMilliseconds > millisecondsTimeout)
                     return false;
 
                 Thread.Yield();

src/Interprocess/ValueStopwatch.cs

@@ -0,0 +1,25 @@
+using System.Diagnostics;
+
+namespace Cloudtoid.Interprocess;
+
+// Inspired by https://github.com/dotnet/aspnetcore/blob/main/src/Shared/ValueStopwatch/ValueStopwatch.cs
+internal readonly struct ValueStopwatch
+{
+    private readonly long start;
+    private ValueStopwatch(long start) => this.start = start;
+    public readonly bool IsActive => start != 0;
+    public static ValueStopwatch StartNew() => new(Stopwatch.GetTimestamp());
+
+    public readonly TimeSpan GetElapsedTime()
+    {
+        // Start timestamp can't be zero in an initialized ValueStopwatch. It would have to be literally the first thing executed when the machine boots to be 0.
+        // So it being 0 is a clear indication of default(ValueStopwatch)
+        if (!IsActive)
+        {
+            throw new InvalidOperationException(
+                "An uninitialized, or 'default', ValueStopwatch cannot be used to get elapsed time.");
+        }
+
+        return Stopwatch.GetElapsedTime(start);
+    }
+}