def draw_memory_state(self, mem_box, size_box, start_height, temp_memory, *args):
# Unpack memory state details
memory_state = temp_memory['memory_state']
# wait_queue = temp_memory['processes_waiting']
event_details = temp_memory['event']
process_id,arrival_bit,curr_time,burst_time,process_size = event_details
chart_wid = Widget()
# Increment in width per unit size
self.inc = Window.width/(int(data_mem['mem_size'])*1.5)
# Add description labels
label = Label(text='Memory state: ', size_hint_x=None, width=self.margin_left)
mem_box.add_widget(label)
s_label = Label(text='Size: ', size_hint_x=None, width=self.margin_left, valign='top', halign='center')
s_label.text_size = s_label.size
size_box.add_widget(s_label)
# Draw the memory state rectangles and add size labels
if not memory_state:
self.add_process(chart_wid, mem_box, size_box, start_height, 'hole', 0, data_mem['mem_size'])
else:
for i,memory_slot in enumerate(memory_state):
process_id1, start1, end1 = memory_slot
if(len(memory_state) == 1): # only tuple in list
if(start1 > 0):
self.add_process(chart_wid, mem_box, size_box, start_height, 'hole', 0, start1)
self.add_process(chart_wid, mem_box, size_box, start_height, process_id1, start1, (end1-start1))
if(data_mem['mem_size']-end1 > 0):
self.add_process(chart_wid, mem_box, size_box, start_height, 'hole', end1, (data_mem['mem_size']-end1))
elif(i == len(memory_state)-1): #last tuple, more tuples preceded
self.add_process(chart_wid, mem_box, size_box, start_height, process_id1, start1, (end1-start1))
if(data_mem['mem_size']-end1 > 0):
self.add_process(chart_wid, mem_box, size_box, start_height, 'hole', end1, (data_mem['mem_size']-end1))
else:
process_id2,start2,end2 = memory_state[i+1]
if(i == 0): # first tuple, more tuples follow
if(start1 > 0):
self.add_process(chart_wid, mem_box, size_box, start_height, 'hole', 0, start1)
self.add_process(chart_wid, mem_box, size_box, start_height, process_id1, start1, (end1-start1))
if(start2-end1 > 0):
self.add_process(chart_wid, mem_box, size_box, start_height, 'hole', end1, (start2-end1))
# Add size label for the end of memory
s_label = Label(text=str(data_mem['mem_size']), size_hint_x=None, width=self.inc*(data_mem['mem_size']), halign='left', valign='top')
s_label.text_size = s_label.size
size_box.add_widget(s_label)
# Add the widget used to draw the meomory state on the screen
mem_box.add_widget(chart_wid)
# Drawing the wait queue
python类width()的实例源码
def draw_wait_queue(self, wait_box, status_box, wait_to_memory_box, start_height, temp_memory, *args):
wait_queue = temp_memory['processes_waiting']
event_details = temp_memory['event']
process_id,arrival_bit,curr_time,burst_time,process_size = event_details
wait_to_memory = temp_memory['wait_to_memory']
external_fragmentation = temp_memory['external_fragmentation']
wait_flag=0 # to check whether process was added to the wait queue
label = Label(text='Wait Queue: ', size_hint_x=None, width=self.margin_left, valign='top', halign='center')
label.text_size = label.size
wait_box.add_widget(label)
s_label = Label(text='Status: ', size_hint_x=None, width=self.margin_left, valign='top', halign='center')
s_label.text_size = s_label.size
status_box.add_widget(s_label)
wm_label = Label(text='Processes loaded into memory from wait queue: ', size_hint_x=None, width=self.margin_left + kivy.metrics.dp(230), valign='top', halign='center')
wm_label.text_size = wm_label.size
wait_to_memory_box.add_widget(wm_label)
if not wait_queue:
w_label = Label(text='Empty', size_hint_x=None, width='50dp', halign='left', valign='top')
w_label.text_size = w_label.size
wait_box.add_widget(w_label)
for process in wait_queue:
process_name, process_s,process_burst = process
if(process_name == process_id):# will only happen if arrival_bit=1
wait_flag=1 # process was added to wait queue
w_label = Label(text=str(process_name), size_hint_x=None, width='40dp', halign='left', valign='top')
w_label.text_size = w_label.size
wait_box.add_widget(w_label)
if(arrival_bit == 1):
if(wait_flag == 1 and external_fragmentation == 1):
ss_label = Label(text='Process ' + str(process_id) + ' was added to the wait queue because of external fragmentation though enough free memory is available.', size_hint_x=None, width='800dp', halign='left', valign='top')
elif(wait_flag == 1 and external_fragmentation == 0):
ss_label = Label(text='Process ' + str(process_id) + ' was added to the wait queue due to insufficient memory available.', size_hint_x=None, width='800dp', halign='left', valign='top')
else:
ss_label = Label(text='Process ' + str(process_id) + ' was assigned a slot in the main memory.', size_hint_x=None, width='800dp', halign='left', valign='top')
wm_label = Label(text='None', size_hint_x=None, width='50dp', valign='top', halign='left')
wm_label.text_size = wm_label.size
wait_to_memory_box.add_widget(wm_label)
else:
if not wait_to_memory:
ss_label = Label(text='Process ' + str(process_id) + ' has succesfully been deallocated memory.', size_hint_x=None, width='800dp', halign='left', valign='top')
wm_label = Label(text='None', size_hint_x=None, width='50dp', valign='top', halign='left')
wm_label.text_size = wm_label.size
wait_to_memory_box.add_widget(wm_label)
else:
ss_label = Label(text='Process ' + str(process_id) + ' has succesfully been deallocated memory. ', size_hint_x=None, width='800dp', halign='left', valign='top')
for processes in wait_to_memory:
wm_label = Label(text= str(processes), size_hint_x=None, width='40dp', halign='left', valign='top')
wm_label.text_size = wm_label.size
wait_to_memory_box.add_widget(wm_label)
ss_label.text_size = ss_label.size
status_box.add_widget(ss_label)
