/// <summary>
/// Initializes a new instance of the <see cref="_instance"/> class.
/// </summary>
private Jvm(IntPtr jvmPtr)
{
Debug.Assert(jvmPtr != IntPtr.Zero);
_jvmPtr = jvmPtr;
var funcPtr = (JvmInterface **)jvmPtr;
var func = **funcPtr;
GetDelegate(func.AttachCurrentThread, out _attachCurrentThread);
// JVM is a singleton, so this is one-time subscription.
// This is a shortcut - we pass DetachCurrentThread pointer directly as a thread exit callback,
// because signatures happen to match exactly.
_threadExitCallbackId = UnmanagedThread.SetThreadExitCallback(func.DetachCurrentThread);
var env = AttachCurrentThread();
_methodId = new MethodId(env);
// Keep AppDomain check here to avoid JITting GetCallbacksFromDefaultDomain method on .NET Core
// (which fails due to _AppDomain usage).
_callbacks = AppDomain.CurrentDomain.IsDefaultAppDomain()
? new Callbacks(env, this)
: GetCallbacksFromDefaultDomain();
}
/// <summary>
/// Entry point.
/// </summary>
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($"Managed thread #{threadLocalVal} started.");
UnmanagedThread.EnableCurrentThreadExitEvent(callbackId, new IntPtr(threadLocalVal));
Thread.Sleep(100);
Console.WriteLine($"Managed thread #{threadLocalVal} ended.");
});
thread.Start();
}
UnmanagedThreadsExitEvent.Wait();
Console.WriteLine("All unmanaged threads have exited.");
UnmanagedThread.RemoveThreadExitCallback(callbackId);
}
public void TestThreadExitFiresWhenEnabled([Values(true, false)] bool enableThreadExitCallback)
{
using (var evt = new ManualResetEventSlim())
{
var threadLocalVal = new IntPtr(42);
var resultThreadLocalVal = IntPtr.Zero;
UnmanagedThread.ThreadExitCallback callback = val =>
{
// ReSharper disable once AccessToDisposedClosure
evt.Set();
resultThreadLocalVal = val;
};
GC.KeepAlive(callback);
var callbackId = UnmanagedThread.SetThreadExitCallback(Marshal.GetFunctionPointerForDelegate(callback));
try
{
ParameterizedThreadStart threadStart = _ =>
{
if (enableThreadExitCallback)
{
UnmanagedThread.EnableCurrentThreadExitEvent(callbackId, threadLocalVal);
}
};
var t = new Thread(threadStart);
t.Start();
t.Join();
var threadExitCallbackCalled = evt.Wait(TimeSpan.FromSeconds(1));
Assert.AreEqual(enableThreadExitCallback, threadExitCallbackCalled);
Assert.AreEqual(enableThreadExitCallback ? threadLocalVal : IntPtr.Zero, resultThreadLocalVal);
}
finally
{
UnmanagedThread.RemoveThreadExitCallback(callbackId);
}
}
}