def __init__(self):
self.scheduler = Scheduler()
self.memory = Memory(ContinuousAssignment())
self.cpu = CPU(self, self.memory)
self.timer = Timer(self, self.cpu)
self.io_manager = IOManager(self)
self.irq_manager = IRQManager(self)
class Kernel():
_pid_count = 1
def __init__(self):
self.scheduler = Scheduler()
self.memory = Memory(ContinuousAssignment())
self.cpu = CPU(self, self.memory)
self.timer = Timer(self, self.cpu)
self.io_manager = IOManager(self)
self.irq_manager = IRQManager(self)
def irq(self, type, pcb):
self.irq_manager.add_irq((type, pcb))
def _exec_pcb(self):
if self.scheduler.processes:
(next, quantum) = self.scheduler.get_next()
if self.cpu.process != next:
self.timer.quantum = quantum
self.cpu.assign(next)
def _evt_timeout(self, pcb):
self.cpu.free()
try:
self.scheduler.remove_process(pcb)
self.scheduler.add_process(pcb)
except ValueError:
pass
def _evt_io(self, pcb):
self.cpu.free()
self.scheduler.remove_process(pcb)
self.io_manager.add_process(pcb)
def _evt_ready(self, pcb):
self.scheduler.add_process(pcb)
def _evt_finish(self, pcb):
logging.info("KERNEL finish PID: %s" % pcb.pid)
self.scheduler.remove_process(pcb)
self.memory.unload(pcb)
def load(self, program, priority = None):
pid = self.__class__._pid_count = self.__class__._pid_count + 1
pcb = PCB(program, pid, priority)
try:
self.memory.load(pcb)
self.irq("READY", pcb)
except Exception:
logging.error("No memory available")