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Shouldn’t the Log method block?
namespace Sandbox {
class Program {
static void Main(string[] args) {
var log = new Logger();
lock (log) {
log.Log("Hello World!");
}
}
}
public class Logger {
public void Log(string message) {
lock (this) {
Console.WriteLine(message);
}
}
}
}
The same thread is acquiring the same lock twice. This works because .NET supports so-called recursive locks (aka reentrant mutexes).