Question

During the covid-19 pandemic banks in Turkey started to allow only a few numbers of customers to be present in the branch. Assume that 20 customers will visit bank and perform some operations with their bank accounts. The bank only allows 2 customers at a time. You should implement this scenario using 2 threads and a main thread (3 threads in total). Simulate that each customer will spend some random time between 5 – 10 seconds in branch. You should output a message when the customer enters and leaves the branch and also while performing an operation with the sufficient customer id. Your code should have outputs pretty much like the following example.

Ex:

Customer 1 entered the bank.

Customer 1 performing an operation.

Customer 2 entered the bank.

Customer 2 performing an operation.

Customer 1 left the bank.

Customer 3 entered the bank.

Customer 3 started performing an operation.

Customer 3 left the bank.

Customer 2 left the bank.

Customer 4 entered the bank.

Customer 5 entered the bank.

Customer 4 started an operation.

Customer 5 started an operation.

Answer 1

aux 1 - Q te aux 1.py Pycharm Projects untitled pythonjs te aux1.py ht_ml.py te ht_ml1.py teht_ml2.py import threading import time import random 1 3 - 7: Structure T 1: Project 6 customer Status = [] for i in range(0, 20): customerStatus.append() 7 # customerStatus=0: customer's banking operation is pending # customer Status=1: customer's banking operation is completed 8 9 10 11 class Counter(object): # for maintaining mutual exclusion def __init__(self, start=0): self.lock = threading. Lock() 12 13 14 15 16 17 18 19 20 21 Il 22 23 24 def goInsideBank (self, pointer): while (pointer 20): self. lock.acquire() #Waiting for a lock try: #Acquired a lock if (pointer >= 20): return while (customerStatus[pointer] != 0): # checking current customer's status pointer = pointer + 1 if (pointer >= 20): return 2 25 26 27 28 if (pointer >= 20): return * 2: Favorites Run: o aux1 FINISHED 4: Run Python Console 2 Terminal 6: TODO Event Log 47:1 LF UTF-8 4 spaces Python 3.5 2 0 aux 1 - Pycharm Projects untitled python jsfé aux1.py teht_ml.py to ht_ml1.py teht_ml2.py 25 te aux 1.py return 26 27 .. 7: Structure F 1: Project 28 29 30 31 32 33 34 if (pointer >= 20): return customerStatus[pointer]=1 # changing the current customer's status from 0 to 1 because # he is now allowed to enter into the bank print("Customer ", pointer, " entered the bank") s=random.uniform(5,10) # waiting for a random number of seconds between 5-10 print("Customer ", pointer, " performing an operation for ",s," seconds") time.sleep(s) print("Customer ", pointer, " left the bank --Thread ID: ", threading.get_ident) W 35 36 37 38 39 40 finally: #Released a lock self. lock.release 41 42 43 44 def banking(c): for i in range (0,20): c.goInsideBank() print('Done', i) 45 Ill 46 47 48 49 50 51 52 if -_name__ == '__main__': counter1 = Counter counter2 = Counter() t = threading.Thread(target=counter1.goInsideBank, args=(0,)) # creating thread 1 * 2: Favorites o Run: aux 1 FINISHED 4: Run Python Console 2 Terminal ! 6: TODO OPEP 8: E114 indentation is not a multiple of four (comment). PEP 8: E265 block comment should start with '#'. Pycharm Projects untitled python jsfé aux1.py te ht_ml.py to ht_ml1.py ht_ml2.py teaux 1.py Event Log 19:28 LF UTF-8 4 spaces Python 3.5 2 aux 1 - 42 43 44 .- 7: Structure 1: Project def banking(c): for i in range (0,20): c.goInsideBank() print('Done', i) 45 46 47 48 49 50 51 if -_name__ == '__main__': counter1 = Counter() counter2 = Counter() t = threading.Thread(target=counter1.go InsideBank, args=(0,7) t.start() 52 # creating thread 1 53 54 55 t2 = threading.Thread(target=counter2.goInsideBank, args=(0,)) # creating thread 2 t2.start() 56 57 58 59 60 61 62 63 main_thread = threading.currentThread() # main thread for t in threading. enumerate(): if t is not main_thread: # waiting for both the threads to finish t.join() print('FINISHED') 64 * 2: Favorites il Run: aux1 FINISHED 4: Run Python Console 2 Terminal DE 6: TODO OPEP 8: E114 indentation is not a multiple of four (comment). PEP 8: E265 block comment should start with '#'. Pycharm Projects untitled python jsfé aux1.py Pr... to ht_ml.py Teht_ml1.py Leht_ml2.py te aux 1.py Event Log 19:28 LF UTF-8 4 spaces Python 3.5 aux1 Q Run: aux 1 - !- 7: Structure F 1: Project 4 /usr/bin/python3.5 /home/dexter/PycharmProjects/untitled/python_js/aux1.py Customer entered the bank Customer 0 performing an operation for 7.542401089222441 seconds Customer entered the bank Customer performing an operation for 6.240935049598368 seconds Customer 1 left the bank --Thread ID: 140056199165696 Customer entered the bank Customer 2 performing an operation for 7.442692566564105 seconds Customer 0 left the bank --Thread ID: 140056275322624 Customer 3 entered the bank Customer performing an operation for 7.596205466661638 seconds Customer 2 left the bank --Thread ID: 140056199165696 Customer entered the bank Customer performing an operation for 7.521000649516817 seconds Customer 3 left the bank --Thread ID: 140056275322624 Customer entered the bank Customer performing an operation for 7.052174997607327 seconds Customer 4 left the bank --Thread ID: 140056199165696 Customer entered the bank Customer performing an operation for 5.0104698921943625 seconds Customer 5 left the bank --Thread ID: 140056275322624 Customer entered the bank Customer 7 performing an operation for 6.0981763517331276 seconds Customer 6 left the bank --Thread ID: 140056199165696 Customer 8 entered the bank Customer 8 performing an operation for 6.881309486914382 seconds Customer 7 left the bank --Thread ID: 140056275322624 Customer 9 entered the bank Customer 9 performing an operation for 5.528620145877424 seconds Python Console 2 Terminal DE 6: TODO 5 6 7 * 2: Favorites 4: Run Event Log 41:88 LF UTF-8 4 spaces Python 3.5 aux1 Q Pycharm Projects untitled python jsfé aux1.py Pr... to ht_ml.py ht_ml1.py to ht_ml2.py te aux 1.py Run: 1. 7: Structure F 1: Project IR ID aux 1 Customer 8 performing an operation for 6.881309486914382 seconds Customer 7 left the bank --Thread ID: 140056275322624 Customer entered the bank Customer 9 performing an operation for 5.528620145877424 seconds Customer 8 left the bank --Thread ID: 140056199165696 Customer 10 entered the bank Customer 10 performing an operation for 8.520601021441719 seconds Customer 9 left the bank --Thread ID: 140056275322624 Customer 11 entered the bank Customer 11 performing an operation for 6.511392419071287 seconds Customer 11 left the bank --Thread ID: 140056275322624 Customer 12 entered the bank Customer 12 performing an operation for 9.585055103858991 seconds Customer 10 left the bank --Thread ID: 140056199165696 Customer 13 entered the bank Customer 13 performing an operation for 6.718623990846899 seconds Customer 13 left the bank --Thread ID: 140056199165696 Customer 14 entered the bank Customer 14 performing an operation for 8.697976425505889 seconds Customer 12 left the bank --Thread ID: 140056275322624 Customer 15 entered the bank Customer 15 performing an operation for 5.907180436837747 seconds Customer 15 left the bank --Thread ID: 140056275322624 Customer 16 entered the bank Customer 16 performing an operation for 9.658034887904037 seconds Customer 14 left the bank --Thread ID: 140056199165696 Customer 17 entered the bank Customer 17 performing an operation for 8.419494258009694 seconds Customer 17 left the bank --Thread ID: 140056199165696 Python Console 2. Terminal E 6: TODO * 2: Favorites 4: Run Event Log 41:88 LF UTF-8 4 spaces Python 3.5 2 aux 1 Q Pycharm Projects untitled pythonjs te aux1.py Pr... toht_ml.py toht_ml1.py teht_ml2.py teaux 1.py Run: aux 1 - 1. 7: Structure F 1: Project seconds seconds If I t = seconds seconds Customer 12 entered the bank Customer 12 performing an operation for 9.585055103858991 Customer 10 left the bank --Thread ID: 140056199165696 Customer 13 entered the bank Customer 13 performing an operation for 6.718623990846899 Customer 13 left the bank --Thread ID: 140056199165696 Customer 14 entered the bank Customer 14 performing an operation for 8.697976425505889 Customer 12 left the bank --Thread ID: 140056275322624 Customer 15 entered the bank Customer 15 performing an operation for 5.907180436837747 Customer 15 left the bank --Thread ID: 140056275322624 Customer 16 entered the bank Customer 16 performing an operation for 9.658034887904037 Customer 14 left the bank --Thread ID: 140056199165696 Customer 17 entered the bank Customer 17 performing an operation for 8.419494258009694 Customer 17 left the bank --Thread ID: 140056199165696 Customer 18 entered the bank Customer 18 performing an operation for 6.499812964371273 Customer 16 left the bank --Thread ID: 140056275322624 Customer 19 entered the bank Customer 19 performing an operation for 5.390927193978029 Customer 19 left the bank --Thread ID: 140056275322624 Customer 18 left the bank --Thread ID: 140056199165696 FINISHED seconds seconds seconds seconds * 2: Favorites Process finished with exit code o 4: Run Python Console 2 Terminal ! 6: TODO Event Log 41:88 LF UTF-8 4 spaces Python 3.5 2

 import threading import time import random customerStatus = [] for i in range(0, 20): customerStatus.append(0) # customerStatus=0: customer's banking operation is pending # customerStatus=1: customer's banking operation is completed class Counter(object): # for maintaining mutual exclusion def __init__(self, start=0): self.lock = threading.Lock() def goInsideBank(self,pointer): while (pointer<20): self.lock.acquire() #Waiting for a lock try: #Acquired a lock if (pointer >= 20): return while (customerStatus[pointer] != 0): # checking current customer's status pointer = pointer + 1 if (pointer >= 20): return if (pointer >= 20): return customerStatus[pointer]=1 # changing the current customer's status from 0 to 1 because # he is now allowed to enter into the bank print("Customer ", pointer, " entered the bank") s=random.uniform(5,10) # waiting for a random number of seconds between 5-10 print("Customer ", pointer, " performing an operation for ",s," seconds") time.sleep(s) print("Customer ", pointer, " left the bank --Thread ID: ",threading.get_ident()) finally: #Released a lock self.lock.release() def banking(c): for i in range (0,20): c.goInsideBank() print('Done',i) if __name__ == '__main__': counter1 = Counter() counter2 = Counter() t = threading.Thread(target=counter1.goInsideBank, args=(0,)) # creating thread 1 t.start() t2 = threading.Thread(target=counter2.goInsideBank, args=(0,)) # creating thread 2 t2.start() main_thread = threading.currentThread() # main thread for t in threading.enumerate(): if t is not main_thread: # waiting for both the threads to finish t.join() print('FINISHED')