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How JVM determines which thread should wake up on notify()?

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

answer How JVM determines which thread should wake up on notify()?

How JVM determines which thread should wake up on notify()?

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If multiple threads are waiting on an object’s monitor, JVM

awakens one of them. As per Java specification the choice of this

thread is arbitrary and it is at the discretion of the implementation.

So there is no guarantee of rule that a specific thread will be

awakened by JVM on notify() method call.

public class TargetNotify {
    private Object Targets[] = null;

    public TargetNotify (int numberOfTargets) {
        Targets = new Object[numberOfTargets];

        for (int i = 0; i < numberOfTargets; i++) {
            Targets[i] = new Object();
        }
    }

    public void wait (int targetNumber) {
        synchronized (Targets[targetNumber]) {
            try {
                Targets[targetNumber].wait();
            } catch (Exception e) {}
        }
    }

    public void notify (int targetNumber) {
        synchronized (Targets[targetNumber]) {
            Targets[targetNumber].notify();
        }
    }
}

https://www.oreilly.com/library/view/java-threads-second/1565924185/ch04s03.html

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java jvm

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Contributed on Feb 04 2023

Pragya Keshap

0 Answers Avg Quality 2/10

How JVM determines which thread should wake up on notify()?

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