RLock

Author: rezamobaraki

src/threat_rlock.py

@@ -0,0 +1,43 @@
+"""
+    Race condition
+    Thread safe
+    Dead lock
+    atomic
+"""
+from threading import Thread, RLock
+
+num = 0  # shared resource
+lock = RLock()
+
+
+def add():
+    global num
+    with lock:
+        subtract()
+        for _ in range(100000):
+            num += 1
+
+
+def subtract():
+    global num
+    with lock:
+        for _ in range(100000):
+            num -= 1
+
+
+def both():
+    subtract()
+    add()
+
+
+t1 = Thread(target=add)
+t2 = Thread(target=subtract)
+
+t1.start()
+t2.start()
+
+t1.join()
+t2.join()
+
+print(num)
+print('Done . . . ')