System and method of debugging multi-threaded processes

A system and method of debugging a multi-threaded process with at least one running thread and at least one suspended thread is disclosed. Embodiments utilize a blocking function to block the thread of a process while other threads are allowed to run. The blocking function may be executed in a suspended thread by a debugger under control of a thread blocking controller. The other threads may implement interprocess communication channels for enabling communication between the process and another application. A simulated user interface (UI) of a debugger enables interaction with users while a hardware simulation thread is blocked, where blocking of the hardware simulation thread may be implemented by a thread blocking component implemented externally to the debugger. Where a thread blocking controller is implemented within the debugger, a debugger UI may interact with a user while the hardware simulation thread is blocked and interprocess communication threads are running.