def store_in_memory(self, the_file):
'''Puts a file into the memory. Search for an address available.'''
for a in range(self.get_limit_address()):
if Memory.get_instance().get_value_at(a) is None:
Memory.get_instance().store_at(a, the_file)
break
return a
def readall(self, *args):
'''
Store in memory all the data of a file opened first
in memory, in an address specified.
'''
curr_path = self.get_file_manager().get_current_path()
file_path = curr_path + '/' + args[1].get_value()
file_data = args[0].get_file_at(file_path).get_data()
Memory.get_instance().store_at_relative(args[0], args[2].get_value(),
file_data)
def shutdown(self):
self.set_inactive()
self.get_cpu().shutdown()
self.get_lt_scheduler().set_inactive()
self.get_scheduler().set_inactive()
for d in self.get_io_devices():
self.get_io_devices()[d].shutdown()
Memory.get_instance().clear_all()
Logger.get_instance().close_log_file()
self.reset()
def close(self, file_name):
'''
Decrement the ref_count of the file.
If ref_count reaches 0, removes the file from memory.
'''
complete_name = self.get_current_path() + '/' + file_name
for a in range(self.get_limit_address()):
the_file = Memory.get_instance().get_value_at(a)
if the_file is not None and the_file.get_name() == complete_name:
the_file.dec_ref_count()
if the_file.get_ref_count() <= 0:
Memory.get_instance().remove(a)
break
Logger.get_instance().log_closefile(file_name)
def is_opened(self, file_name):
'''Verify that a file is loaded in the memory.'''
for a in range(self.get_limit_address()):
value = Memory.get_instance().get_value_at(a)
if value is not None and value.get_name() == file_name:
return True
return False
def search_file_in_memory(self, name):
'''Search for a file in memory by receiving a file name.'''
for a in range(self.get_limit_address()):
the_file = Memory.get_instance().get_value_at(a)
if the_file is not None and the_file.get_name() == name:
return the_file
return None
def sub(self, *args):
'''
Instruction for data substract. Not implemented in Strings.
@param args: tuple with PCB and the instruction arguments.
'''
mem = Memory.get_instance()
args[1].do_sub(args[0], args[2], self.get_cpu().get_registers(), mem)
def add(self, *args):
'''
Instruction for data adding. Concatenation in Strings.
@param args: tuple with PCB and the instruction arguments.
'''
mem = Memory.get_instance()
args[1].do_add(args[0], args[2], self.get_cpu().get_registers(), mem)
def mov(self, *args):
'''
Instruction for data moving.
@param args: tuple with PCB, destination and source of the mov.
'''
mem = Memory.get_instance()
args[1].do_mov(args[0], args[2], self.get_cpu().get_registers(), mem)
def load(self, file_name):
'''
Executes a file storaged in the file system, in the folder "programs".
First load the loader :-) , to leave in memory the program to run.
'''
if self.__loader_is_running():
raise OSException('Error: The loader is running.')
loader = self.__make_loader(file_name)
self.__set_time_parameters(loader)
banker = self.get_cpu().get_banker()
banker.loader_come(banker.calculate_new_max(loader.get_pcb()))
self.get_process_store().put_in_all_process(loader)
self.get_process_store().put_in_ready_queue(loader.get_pcb())
while Memory.get_instance().get_value_at(1) is None:
time.sleep(1)
self.__load_program(Memory.get_instance().get_value_at(1))
Memory.get_instance().remove(1)
def __init__(self, is_console):
'''
Constructor of FileManager. This class can be instantiated by the
operating system, or by the console.
'''
if is_console:
Memory()
Logger()
Logger.get_instance().open_log_file()
self._limit_address = MAX_OPENED_FILES
self._current_dir = ('/', 0) #the root directory
self._low_level_fm = LowerLevelFM()
def __init__(self):
''' Constructor of OS.'''
Memory() #create the singleton memory
Logger() #initialize the logger
self._parser = OSParser()
self._file_manager = FileManager(False)
self._proc_store = ProcessStore()
self._io_devices = self.create_io_devices()
banker = BankersAlgorithm(self.get_total_resources())
ProcessKiller(banker, self._proc_store)
self._cpu = CPU(banker, self._io_devices, self._proc_store)
self._scheduler = self.create_scheduler(self._cpu, self._proc_store)
self._lt_scheduler = LTScheduler(self._proc_store)
self._active = False
def intinput(self, *args):
'''Open a screen and request a integer.'''
args[2].do_input(args[0], args[1], Memory.get_instance(), True)
def input(self, *args):
'''Open a screen and request a string.'''
args[2].do_input(args[0], args[1], Memory.get_instance(), False)
def show(self, *args):
'''Print in screen instruction.'''
pcb = args[0]
for arg in args:
if not arg == pcb:
arg.do_show(pcb, Memory.get_instance())
def get_write_data(self, pcb):
'''Get the data for a write operation (as a string).'''
mem = Memory.get_instance()
return str(mem.get_value_at_relative(pcb, self.get_value()))
def get_file_at(self, path):
'''Search for a opened file.'''
return Memory.get_instance().get_value_at(
self.get_files_opened()[path])
def check_available_space(self):
'''Look for a memory address empty, if found it, returns it.'''
for i in range(0, self._limit_address):
if Memory.get_instance().get_value_at(i) is None:
return True
return False