Advantages and Inconveniences of ULT
	ä Advantages ä Thread switching does not involve the kernel: no mode switching ä Scheduling can be application specific: choose the best algorithm. ä ULTs can run on any OS. Only needs a thread library				ä Inconveniences ä Most system calls are blocking and the kernel blocks processes. So all threads within the process will be blocked ä The kernel can only assign processes to processors. Two threads within the same process cannot run simultaneously on two processors