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Preemptive.py
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Preemptive.py
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import random
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QTableWidgetItem
from matplotlib import pyplot as plt
from matplotlib.backends.backend_template import FigureCanvas
from matplotlib.backends.backend_qt5agg import NavigationToolbar2QT as NavigationToolbar
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
class Preemptive:
def processData(self, mainWindow):
process_data = []
global originalWindow
originalWindow = mainWindow
for i in range(0, mainWindow.processTable.rowCount()):
temporary = []
process_id = i
arrival_time = mainWindow.processTable.item(i, 1).text()
burst_time = mainWindow.processTable.item(i, 2).text()
temporary.extend([int(process_id), int(arrival_time), int(burst_time), 0, int(burst_time)])
'''
'0' is the state of the process. 0 means not executed and 1 means execution complete
'''
process_data.append(temporary)
Preemptive.schedulingProcess(self, process_data)
def schedulingProcess(self, process_data):
start_time = []
exit_time = []
s_time = 0
sequence_of_process = []
process_data.sort(key=lambda x: x[1])
'''
Sort processes according to the Arrival Time
'''
while 1:
ready_queue = []
normal_queue = []
temp = []
for i in range(len(process_data)):
if process_data[i][1] <= s_time and process_data[i][3] == 0:
temp.extend([process_data[i][0], process_data[i][1], process_data[i][2], process_data[i][4]])
ready_queue.append(temp)
temp = []
elif process_data[i][3] == 0:
temp.extend([process_data[i][0], process_data[i][1], process_data[i][2], process_data[i][4]])
normal_queue.append(temp)
temp = []
if len(ready_queue) == 0 and len(normal_queue) == 0:
break
if len(ready_queue) != 0:
ready_queue.sort(key=lambda x: x[2])
'''
Sort processes according to Burst Time
'''
start_time.append(s_time)
s_time = s_time + 1
e_time = s_time
exit_time.append(e_time)
sequence_of_process.append(ready_queue[0][0])
for k in range(len(process_data)):
if process_data[k][0] == ready_queue[0][0]:
#print(process_data[k][0]+1,'Start In ', s_time)
break
process_data[k][2] = process_data[k][2] - 1
if process_data[k][2] == 0: # If Burst Time of a process is 0, it means the process is completed
process_data[k][3] = 1
process_data[k].append(e_time)
if len(ready_queue) == 0:
if s_time < normal_queue[0][1]:
s_time = normal_queue[0][1]
start_time.append(s_time)
s_time = s_time + 1
e_time = s_time
exit_time.append(e_time)
sequence_of_process.append(normal_queue[0][0])
for k in range(len(process_data)):
if process_data[k][0] == normal_queue[0][0]:
break
process_data[k][2] = process_data[k][2] - 1
if process_data[k][2] == 0: # If Burst Time of a process is 0, it means the process is completed
process_data[k][3] = 1
process_data[k].append(e_time)
t_time = Preemptive.calculateTurnaroundTime(self, process_data)
w_time = Preemptive.calculateWaitingTime(self, process_data)
Preemptive.printData(self, process_data, t_time, w_time, sequence_of_process)
def calculateTurnaroundTime(self, process_data):
total_turnaround_time = 0
for i in range(len(process_data)):
turnaround_time = process_data[i][5] - process_data[i][1]
'''
turnaround_time = completion_time - arrival_time
'''
total_turnaround_time = total_turnaround_time + turnaround_time
process_data[i].append(turnaround_time)
average_turnaround_time = total_turnaround_time / len(process_data)
'''
average_turnaround_time = total_turnaround_time / no_of_processes
'''
return average_turnaround_time
def calculateWaitingTime(self, process_data):
total_waiting_time = 0
for i in range(len(process_data)):
waiting_time = process_data[i][6] - process_data[i][4]
'''
waiting_time = turnaround_time - burst_time
'''
total_waiting_time = total_waiting_time + waiting_time
process_data[i].append(waiting_time)
average_waiting_time = total_waiting_time / len(process_data)
'''
average_waiting_time = total_waiting_time / no_of_processes
'''
return average_waiting_time
def printData(self, process_data, average_turnaround_time, average_waiting_time, sequence_of_process):
process_data.sort(key=lambda x: x[0])
'''
Sort processes according to the Process ID
'''
'''print(
"Process_ID Arrival_Time Rem_Burst_Time Completed Orig_Burst_Time Completion_Time Turnaround_Time Waiting_Time")
'''
processIDs = [0] * originalWindow.processTable.rowCount()
originalWindow.gnt.cla()
originalWindow.gnt.grid(True)
for i in range(len(process_data)):
for j in range(len(process_data[i])):
#print(process_data[i][j], end="\t\t\t\t")
if (j == 0):
processIDs[i] = process_data[i][j]
self.getTimeSequence(sequence_of_process, process_data, i)
if (j == 5):
item2 = QTableWidgetItem()
item2.setTextAlignment(Qt.AlignCenter)
item2.setData(Qt.EditRole, process_data[i][j])
originalWindow.processTable.setItem(i, 3, item2)
if (j == 6):
item2 = QTableWidgetItem()
item2.setTextAlignment(Qt.AlignCenter)
item2.setData(Qt.EditRole, process_data[i][j])
originalWindow.processTable.setItem(i, 4, item2)
if (j == 7):
item2 = QTableWidgetItem()
item2.setTextAlignment(Qt.AlignCenter)
item2.setData(Qt.EditRole, process_data[i][j])
originalWindow.processTable.setItem(i, 5, item2)
'''print()
print(f'Sequence of Process: {sequence_of_process}')'''
print(f'Average Turnaround Time: {average_turnaround_time}')
print(f'Average Waiting Time: {average_waiting_time}')
print(sequence_of_process,"Start IN: ", )
originalWindow.drawChartAverage(average_turnaround_time, average_waiting_time)
yTicksArray = [i * 10 for i in processIDs]
originalWindow.gnt.set_yticks(yTicksArray)
processIDsIncreased = [i + 1 for i in processIDs]
originalWindow.gnt.set_yticklabels(processIDsIncreased)
originalWindow.canvas = FigureCanvas(originalWindow.figure)
originalWindow.toolbar = NavigationToolbar(originalWindow.canvas, originalWindow)
for i in reversed(range(originalWindow.plotBox.count())):
originalWindow.plotBox.itemAt(i).widget().setParent(None)
originalWindow.plotBox.addWidget(originalWindow.toolbar)
originalWindow.plotBox.addWidget(originalWindow.canvas)
def getTimeSequence(self,sequence_of_process, process_data,PID):
doOnce = False
for i in range(len(sequence_of_process)):
if (sequence_of_process[i] == PID):
if (doOnce == False):
startIn = process_data[0][1] + i
#print("Start In: ", startIn)
doOnce = True
if (doOnce == True and i == len(sequence_of_process) - 1):
endIn = process_data[0][1] + i + 1
#print(" End In: ", endIn)
originalWindow.gnt.broken_barh([(startIn, endIn-startIn)],
(process_data[PID][0] * 10, 10),
facecolors=('tab:' + originalWindow.colorsChart[
random.randrange(len(originalWindow.colorsChart))]))
else:
if (doOnce == True):
endIn = process_data[0][1] + i
#print(" End In: ", endIn)
doOnce = False
originalWindow.gnt.broken_barh([(startIn, endIn-startIn)],
(process_data[PID][0] * 10, 10),
facecolors=('tab:' + originalWindow.colorsChart[
random.randrange(len(originalWindow.colorsChart))]))