Create access_to_resources.py

Author: arifulhaqueuc

scripts/access_to_resources.py

@@ -0,0 +1,41 @@
+import logging
+import random
+import threading
+import time
+
+logging.basicConfig(level=logging.DEBUG,
+                    format='(%(threadName)-10s) %(message)s',
+                    )
+                    
+class Counter(object):
+    def __init__(self, start=0):
+        self.lock = threading.Lock()
+        self.value = start
+    def increment(self):
+        logging.debug('Waiting for lock')
+        self.lock.acquire()
+        try:
+            logging.debug('Acquired lock')
+            self.value = self.value + 1
+        finally:
+            self.lock.release()
+
+def worker(c):
+    for i in range(2):
+        pause = random.random()
+        logging.debug('Sleeping %0.02f', pause)
+        time.sleep(pause)
+        c.increment()
+    logging.debug('Done')
+
+counter = Counter()
+for i in range(2):
+    t = threading.Thread(target=worker, args=(counter,))
+    t.start()
+
+logging.debug('Waiting for worker threads')
+main_thread = threading.currentThread()
+for t in threading.enumerate():
+    if t is not main_thread:
+        t.join()
+logging.debug('Counter: %d', counter.value)