Java synchronization

Java synchronization

Multithreading and synchronization are a very important issue for any Java programmer. A good knowledge of multithreading, synchronization and thread security can put it in front of other developers, at the same time, it is not easy to master this concept. In fact, writing correct concurrent code is one of the most difficult things, even in Java, which has several embedded synchronization utilities. In this tutorial of Java synchronization, we will learn the meaning of Synchronization in Java, why we need synchronization in Java, what can be done in multithreading code in the absence of synchronized constructions? , tips to avoid errors while blocking the critical section in Java and some important points about synchronization in Java.

Once Java provides different constructs to provide synchronization and blocking , for example.  the volatile keyword, the atomic variable, the explicit block using the java.util.concurrent.lock. Lock interface and its popular implementations, for example, ReentrantLock and ReentrantReadWriteLock , it is even more important to understand the difference between synchronized constructions and other constructions.

Remember, a clear understanding of synchronization is necessary to write the correct concurrent code in Java, which is free of multithreading problems, such as deadlock, race conditions and thread-safety. I am sure that the things learned in this tutorial of Java synchronization will help. Once you have gone through this article, you can read more Java Concurrency in Practice to develop your concept. This is the one of that book that every Java developer should read.

Following is the general form of a synchronized block:

// Only one thread can execute at a time. 
// sync_object is a reference to an object
// whose lock associates with the monitor. 
// The code is said to be synchronized on
// the monitor object
synchronized(sync_object)
{
   // Access shared variables and other
   // shared resources
}

What is synchronization in Java

Synchronization in Java is an important concept, since Java is a multi-layered language in which several chaining is executed in parallel for the complete execution of the program. In the multi-thread environment the synchronization of the Java object or the synchronization of the Java class becomes extremely important. Synchronization in Java is possible using “synchronized” and “volatile” Java keywords.

The simultaneous access of shared objects in Java shows a type of error: interference of chaining and memory consistency errors. To avoid these errors, it is necessary to properly synchronize your Java object to allow mutual exclusive access of the critical section to two chains.

By the way, this Java sync tutorial is a continuation of my article. As HashMap works in Java and the difference between HashMap and Hashtable in Java, if you have not read yet, you can find some useful information based on my experience in the Java collections.

Why do we need synchronization in Java?

If your code is running in a multi-tenancy environment, you will need synchronization for objects, which are shared across multiple chaining, to avoid any state corruption or any type of unexpected behavior. Synchronization in Java will only be necessary if the shared object is mutable. If the shared object is read-only, it is not necessary to synchronize despite executing several segments. The same thing happens with what the threads are doing with an object, if all the threads are just a read value, then you do not need synchronization in Java. JVM guarantees that the synchronized Java code will be executed only by one chaining at a time.

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In summary, the synchronized Java keyword provides the following essential functionality for simultaneous scheduling:

  • The keyword synchronized in Java provides blocking, which guarantees mutually exclusive access to the shared resource and prevents the data race.
  • Synchronized keywords also prevent the reordering of the code declaration by the compiler, which can cause a subtle competitor problem if we do not use synchronized or volatile keywords.
  • The synchronized keyword implies locking and unlocking. before entering a synchronized method or block segment you need to acquire the lock, at this time it reads data from the main memory that the cache and when the lock is released, it is released recording operation in the main memory that eliminates incoherence errors of memory.

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