In Solaris 9 and Solaris 10, there is a one-to-one mapping between ULTs and LWPs. In Solaris 8, a single LWP supports one or more ULTs.

a. What is the possible benefit of allowing a many-to-one mapping of ULTs to LWPs?

b. In Solaris 8, the thread execution state of a ULT is distinct from that of its LWP. Explain why.
c. Figure 4.18 shows the state transition diagrams for a ULT and its associated LWP in Solaris 8 and 9. Explain the operation of the two diagrams and their relationships.

Transcribed Image Text:

Stop User-level threads Runnable Wakeup Continue Stop Sleeping Stopped Stop Sleep Active Time slice or preempt Running Stop Wakeup Dispatch Blocking system call Stopped Runnable Continue Wakeup Stop Blocked Lightweight processes