$1$a$)(5$ points$)$ As briefly illustrated in class, a Python application can have several threads. Is this

consistent with the basic notion of threads in an operating system? Explain.

$1$b$)(10$ points$)$ Describe the steps the OS must perform to support the creation and execution of the

main program and the corresponding threads.

def task$($id$)$:

print$($f$\text{'}$Starting Task ID: $\{$id$\}...\text{'})$

sleeptime $=$ random.randrange$(5,15,1)$

print$($f$\text{'}$Task: $\{$id$\}$ sleeping for: $\{$sleeptime$\}\text{'})$

sleep$($sleeptime$)$

print$($f$\text{'}$Finished Task ID: $\{$id$\}\text{'})$

if $\_\_$name$\_\_==\text{'}\_\_$main$\_\_\text{'}$:

start$\_$time $=$ perf$\_$counter$()$

#create two threads

t$1=$ Thread$($target$=$task, args$=(1,))$

#start the threads

t$1.$start$()$

#wait for each thread to finish

t$1.$join$()$

end$\_$time $=$ perf$\_$counter$()$

print$($f$\text{'}$Total time to complete: $\{$end$\_$time$-$start$\_$time$\}$ sec$\text{'})$

$1$c$)(10$ points$)$ Alter the above code to create and start $2$ more Thread instances for a total of $3.$ Add the

required code below:

$2)(5$ points$)$ What is the PCB used for?