Initial commit

srcs/RobotNet10/RobotApp/Communication/CeresSharp/Native/SafeHandles/BaseSafeHandle.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Runtime.InteropServices;
+using Microsoft.Win32.SafeHandles;
+
+namespace CeresSharp.Native.SafeHandles;
+
+/// <summary>
+/// Base class for all Ceres native resource handles.
+/// </summary>
+public abstract class BaseSafeHandle : SafeHandleZeroOrMinusOneIsInvalid
+{
+    protected BaseSafeHandle() : base(true)
+    {
+    }
+
+    protected BaseSafeHandle(IntPtr handle, bool ownsHandle) : base(ownsHandle)
+    {
+        SetHandle(handle);
+    }
+
+    private volatile bool _released = false;
+
+    protected override bool ReleaseHandle()
+    {
+        // Prevent double-free by checking if already released
+        // Use volatile read/write for thread safety in finalizer
+        if (_released || IsInvalid)
+            return true; // Already released or invalid
+
+        try
+        {
+            // Add try-catch to prevent crash in finalizer thread
+            // If native handle is already freed or invalid, this will fail gracefully
+            ReleaseNativeHandle(handle);
+            _released = true;
+            return true;
+        }
+        catch
+        {
+            // Ignore errors in finalizer - native handle may already be freed
+            // Mark as released to prevent retry
+            _released = true;
+            // Return true to indicate handle was "released" (even if it failed)
+            return true;
+        }
+    }
+
+    /// <summary>
+    /// Releases the native handle. Must be implemented by derived classes.
+    /// </summary>
+    protected abstract void ReleaseNativeHandle(IntPtr handle);
+}