Unmanaged Thread Utils

Unmanaged thread utils for .NET

Thread Exit Callback

• Provides a way to subscribe to a Thread Exit event
• The event is fired on the Thread that is about to exit
• Cross-platform (Windows, Linux, MacOS)

Example:

// Use static field to make sure that delegate is alive.
private static readonly UnmanagedThread.ThreadExitCallback ThreadExitCallbackDelegate = OnThreadExit;

public static void Main()
{
    var threadExitCallbackDelegatePtr = Marshal.GetFunctionPointerForDelegate(ThreadExitCallbackDelegate);
    var callbackId = UnmanagedThread.SetThreadExitCallback(threadExitCallbackDelegatePtr);

    for (var i = 1; i <= ThreadCount; i++)
    {
        var threadLocalVal = i;

        var thread = new Thread(_ =>
        {
            Console.WriteLine($"Managed thread #{threadLocalVal} started.");
            UnmanagedThread.EnableCurrentThreadExitEvent(callbackId, new IntPtr(threadLocalVal));
        });

        thread.Start();
    }

    UnmanagedThread.RemoveThreadExitCallback(callbackId);
}

private static void OnThreadExit(IntPtr data)
{
    Console.WriteLine($"Unmanaged thread #{data.ToInt64()} is exiting.");
}