Try to fix sending the manifest

src/Ultra.Sampler/MacOS/MacOSUltraSampler.cs

@@ -75,15 +75,6 @@ protected override void EnableImpl()
     {
         _nextModuleEventIndexToLog = 0;
         _captureEnabled = true;
-        // Make sure to always send the manifest before resuming the capture thread
-        try
-        {
-            EventSource.SendCommand(UltraSamplerSource.Log, EventCommand.SendManifest, null);
-        }
-        catch
-        {
-            // Ignore
-        }
         _resumeCaptureThread.Set();
     }
 
@@ -103,10 +94,18 @@ private unsafe void RunImpl()
             MacOS.MacOSLibSystem.pthread_threadid_np(0, out var currentThreadId)
                 .ThrowIfError("pthread_threadid_np");
 
+            bool sendManifest = true;
+
             while (!_stopped)
             {
                 if (_captureEnabled)
                 {
+                    if (sendManifest)
+                    {
+                        SendManifest();
+                        sendManifest = false;
+                    }
+
                     // Load all pending native module events before sampling
                     NotifyPendingNativeModuleEvents();
 
@@ -119,6 +118,7 @@ private unsafe void RunImpl()
                 else
                 {
                     _resumeCaptureThread.WaitOne();
+                    sendManifest = true;
                 }
             }
         }
@@ -128,6 +128,19 @@ private unsafe void RunImpl()
         }
     }
 
+    private static void SendManifest()
+    {
+        // Make sure to always send the manifest before resuming the capture thread
+        try
+        {
+            EventSource.SendCommand(UltraSamplerSource.Log, EventCommand.SendManifest, null);
+        }
+        catch
+        {
+            // Ignore
+        }
+    }
+
     private void CallbackDyldAdded(MacOSLibSystem.mach_header* header, nint slideVmAddr)
     {
         AddModuleEvent(_initializingModules ? NativeModuleEventKind.AlreadyLoaded : NativeModuleEventKind.Loaded, (nint)header);
@@ -245,7 +258,7 @@ private static ulong GetDyldCodeSize(nint headerPtr)
                 }
             }
         }
-        
+
         return size;
     }