How do you limit a process' CPU usage on Windows? (need code, not an app)

Question

There is programs that is able to limit the CPU usage of processes in Windows. For example BES and ThreadMaster. I need to write my own program that does the same thing as these

Answer 1

You probably want to run the process(es) in a job object, and set the maximum CPU usage for the job object with SetInformationJobObject, with JOBOBJECT_CPU_RATE_CONTROL_INFORMATION.