def run(self):
#wrong operation
if(RM.PI == 1):
print("wrong operation in ", RM.current_vm.PAGE)
Interrupt.kill_vm()
#division by zero
elif(RM.PI == 2):
print("division by zero in ", RM.current_vm.PAGE)
Interrupt.kill_vm()
#error while loading user's program
elif(RM.PI == 3):
print("error while trying to load ", Load.filename)
#success loading user's program
elif(RM.PI == 4):
Process.find_by_name("Main").state = State.READY
#test
elif(RM.PI == 5):
Process.find_by_name("Load").state = State.READY
#perhaps those two will be optional
if(RM.SI == 1):
pass
#read
elif(RM.SI == 2):
pass
#halt
elif(RM.SI == 3):
RM.current_vm.state = State.FINISHED
RM.current_vm = None
RM.TI = 0
#watchdog
elif(RM.SI == 4):
Interrupt.kill_vm()
#timer
if(RM.TI == 0):
#get all active vms
vms = VM.get_active()
#for vm in vms:
# print(vm, " ", vm.PAGE)
if vms != []:
#this vm already worked
vms[0].state = State.BLOCKED
#rotate vms list
VM.rotate()
#make first ready
vms[0].state = State.READY
#set timer for vm
RM.TI = TIMER_PERIOD
#turn on watchdog
Process.find_by_name("Watchdog").state = State.READY
else:
#no need to use watchdog if there is no user's programs
Process.find_by_name("Watchdog").state = State.BLOCKED
#clear
RM.PI = 0
RM.SI = 0
self.state = State.READY
