Return
….
….
… ….
…
….
…
…
…
Figure 3.16 ———————————-,
Table 3.9 UNIX Process States
Preempt
,
…., ,
UNIX Process State Transition Diagnlm
User Running
Kernel Running
Ready to Run, in Memory Asleep in Memory
Rendy lo Run, Swapped
Executing in user mode.
Executing in kernel mode.
Sleeping, SWflPPI!U
Unable to execute until an evenl occUr5:process is in main menlory (a blOcked state).
Proccssis rondylo run, but the swapper must swap the process into muin memory before the kernel enn schedule it to execut~.
TIle process is awaitingnn event and hns been swapped to secondary storage (nblocted state).
Process is rcturningfronl kernel to user modt!, butlhe kernel preempts it nnd does a process SWitch to schedule another process.
Process is newly created und not yet rendy to. run.
Process no. longer exists. but it leaves a record Cor its parent process to
Preempted
Created
Zombie —–.~-~—, -~” -.———
-_
——- –.-“-,– \”,
—-
– — “.-.–..-~— –
– – – – – – _ . __. _ – –
..-
–
-”
~-.”— –
…—-~ ..
…
Ready to run as soon as the kentel schedules it.
SwupOUl
SW’dP in
S”op out
\Vllkeup