Can you check if following code is thread-safe?

Pragya Keshap answered on February 4, 2023 Popularity 2/10 Helpfulness 1/10

answer Can you check if following code is thread-safe?

Can you check if following code is thread-safe?

Comment

public class SingletonDoubleCheck {
private SingletonDoubleCheck instance = null;
public SingletonDoubleCheck getInstance() {
if (instance == null) {
synchronized (SingletonDoubleCheck.class) {
if (instance == null) {
instance = new SingletonDoubleCheck();
}
}
}
return instance;
}
}
The above-mentioned code is for creating a Singleton class. But this
code is not thread-safe.
In this we check the value of instance second time in the
synchronized block. But the JIT compiler can rearrange the
Bytecode in such a way that the reference to SingletonDoubleCheck
instance will be set before the execution of constructor.
Due to this the method getInstance() will return an object that may
not have been initialized properly.
We can use the keyword volatile for instance to make this threadsafe code.
Any variables that is marked as volatile will be visible to other
threads only after the completion of the constructor of the object

Popularity 2/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java

Link to this answer
Share Copy Link

Contributed on Feb 04 2023

Pragya Keshap

0 Answers Avg Quality 2/10

Can you check if following code is thread-safe?

Contents

More Related Answers

Can you check if following code is thread-safe?

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.