Add program using locking

Author: arifulhaqueuc

app/script_23.py

@@ -0,0 +1,50 @@
+#Python multithreading example to demonstrate locking.
+#1. Define a subclass using Thread class.
+#2. Instantiate the subclass and trigger the thread. 
+#3. Implement locks in thread's run method. 
+
+import threading
+import datetime
+
+exitFlag = 0
+
+class myThread (threading.Thread):
+    def __init__(self, name, counter):
+        threading.Thread.__init__(self)
+        self.threadID = counter
+        self.name = name
+        self.counter = counter
+    def run(self):
+        print "Starting " + self.name
+        # Acquire lock to synchronize thread
+        threadLock.acquire()
+        print_date(self.name, self.counter)
+        # Release lock for the next thread
+        threadLock.release()
+        print "Exiting " + self.name
+
+def print_date(threadName, counter):
+    datefields = []
+    today = datetime.date.today()
+    datefields.append(today)
+    print "%s[%d]: %s" % ( threadName, counter, datefields[0] )
+
+threadLock = threading.Lock()
+threads = []
+
+# Create new threads
+thread1 = myThread("Thread", 1)
+thread2 = myThread("Thread", 2)
+
+# Start new Threads
+thread1.start()
+thread2.start()
+
+# Add threads to thread list
+threads.append(thread1)
+threads.append(thread2)
+
+# Wait for all threads to complete
+for t in threads:
+    t.join()
+print "Exiting the Program!!!"