2proc_pmutex.py

# Author Darío Clavijo
import random
import time
import sys
import threading

interested = [False, False]


def enter_region(process):
    global interested
    k = 0
    print("enter_region: %d" % process)

    other = 1 - process
    interested[process] = True
    turn = process
    while turn == process and interested[other] == True:
        k += 1
        # if (k % 10000 == 0):
        # 	print "process wait",process
        continue
    print("entered_critical: %d ticks %d" % (turn, k))


def leave_region(process):
    global interested
    print("leave_region: %d" % process)

    interested[process] = False


def proc(n):
    t = random.randint(0, 1)
    enter_region(n)
    time.sleep(t)
    leave_region(n)


ts = []
for n in range(0, 2):
    t = threading.Timer(0.5, proc, args=(n,))
    t.start()
    ts.append(t)