ThreadThread 1 Thread 2

Thread 1 Thread 2 ---------------------------------- ---------------------------------- 1. Reads x (reads 0) [Context Switch! ⏸️] 1. Reads x (still reads 0!) 2. Adds 1 (0 + 1 = 1) 3. Writes x = 1 💾 [Context Switch! ⏸️] 2. Adds 1 (0 + 1 = 1) 3. Writes x = 1 💾 (Overwrites Thread 2!) This is the problem in multi threading 😬😬😬