def test_time_since_dispatch_01(self):
cpu = CPU()
a_ready_pcb = self.pcbs.pop().setReady()
cpu.dispatch(pcb=a_ready_pcb)
SystemTimer().tick()
SystemTimer().tick()
self.assertEqual(cpu.time_since_dispatch, 20)
def test_dispatch_01(self):
p1 = PCB(Process())
cpu = CPU()
p1.setReady() # change state from inactive to ready
old_process = cpu.dispatch(p1)
# because p1 is our first process, we assume that the old process is none
self.assertIsInstance(old_process, type(None))
def test_time_since_dispatch_02(self):
"""now we do 10 dispatches a 20ms"""
cpu = CPU()
p1 = self.pcbs.pop().setReady()
p2 = self.pcbs.pop().setReady()
time_0 = cpu.time_since_dispatch
#let it work 10s
cpu.dispatch(p1)
SystemTimer().tick()
time_1 = cpu.time_since_dispatch
#and now 20
cpu.dispatch(p2)
SystemTimer().tick()
SystemTimer().tick()
time_2 = cpu.time_since_dispatch
self.assertEqual(time_1, 10)
self.assertEqual(time_2, 20)
def test_dispatch_02(self):
"""
do ten dispatches and check if the last process is the running one
:return:
"""
cpu = CPU()
for pcb in self.pcbs:
pcb.setReady()
returning_pcb = cpu.dispatch(pcb)
if isinstance(returning_pcb,PCB):
returning_pcb.setInactive()
else:
#first process in cpu is None, because it is uninitialized
pass
self.assertEqual(cpu.running_process, self.pcbs[-1])
def test_dispatchCounter(self):
cpu = CPU()
for pcb in self.pcbs:
pcb.setReady()
cpu.dispatch(pcb) # dispatch ten times
self.assertEqual(cpu.dispatch_counter, 10)