Race Conditions in Java Multithreading

Race conditions is a situation that can occur when two or more threads access the same variables in a way where thread scheduling may affect the final result. The two threads "race" over access to the variables. There are two primary access patterns which can cause race conditions: Check-then-act and read-modify-write. I cover both of these race conditions causes in this video.

A section of code where race conditions can occur is called a critical section. To secure critical sections they must be made atomic. I show a few examples of how to do that in this video too.

Race conditions in concurrent programming can easily lead to concurrency errors in your applications, so it is important to understand what race conditions is, and how to avoid it!

Chapters: 0:00 Race Conditions introduction 0:54 Read-modify-write race condition example 8:06 Read-modify-write solution with atomic, synchronized block 9:47 One thread writes, one thread reads - example 13:27 Two threads that access same objects, but not write to the same objects. 16:24 Check-then-act race condition example 20:24 Check-then-act solution with atomic, synchronized block

Race Conditions - text: http://tutorials.jenkov.com/java-concurrency/race-conditions-and-critical-sections.html

Java Concurrency tutorials - text / video: http://tutorials.jenkov.com/java-concurrency/index.html https://www.youtube.com/playlist?list=PLL8woMHwr36EDxjUoCzboZjedsnhLP1j4

Java Memory Model - The Basics - text / video: http://tutorials.jenkov.com/java-concurrency/java-memory-model.html https://www.youtube.com/watch?v=LCSqZyjBwWA&list=PLL8woMHwr36EDxjUoCzboZjedsnhLP1j4&index=3&t=803s

Java Happens Before Guarantee - video: https://www.youtube.com/watch?v=oY14UyP61F8&list=PLL8woMHwr36EDxjUoCzboZjedsnhLP1j4&index=4

Java Synchronized - text / video: http://tutorials.jenkov.com/java-concurrency/synchronized.html https://www.youtube.com/watch?v=eKWjfZ-TUdo&list=PLL8woMHwr36EDxjUoCzboZjedsnhLP1j4&index=5

Java Volatile - text / video: http://tutorials.jenkov.com/java-concurrency/volatile.html https://www.youtube.com/watch?v=nhYIEqt-jvY&list=PLL8woMHwr36EDxjUoCzboZjedsnhLP1j4&index=6

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