public void Do2(int i)
{
Task.Factory.StartNew(async() =>
{
var r = await AsyncMonitor.TryEnter(locker2, 20);
Console.WriteLine($"before {i} {r}");
if (r)
{
Console.WriteLine($"locked {i}");
try
{
Thread.Sleep(100);
}
finally
{
AsyncMonitor.Exit(locker2);
}
}
else
{
Console.WriteLine($"not locked {i}");
}
});
}