What is the Difference between wait() and sleep()

Question

What is the Difference between wait() and sleep()

What is the difference between a wait() and sleep() in Threads?

Is my understanding that a wait()-ing Thread is still in running mode and uses CPU cycles but a sleep()-ing does not consume any CPU cycles correct?

Why do we have both wait() and sleep(): how does their implementation vary at a lower level?

multithreading java

3 years ago by akshay1995

2 Answers

Login / Signup to Answer the Question.

Login Signup

**RoliMishra** · Answer 1 · 2021-05-11T13:56:55

A wait can be "woken up" by another thread calling notify on the monitor which is being waited on whereas a sleep cannot. Also, a wait (and notify) must happen in a block synchronized on the monitor object whereas sleep does not:

Object mon = ...;

synchronized (mon) {

    mon.wait();

}

At this point, the currently executing thread waits and releases the monitor. Another thread may do

synchronized (mon) { mon.notify(); }

**kshitijrana14** · Answer 2 · 2021-05-13T13:54:57

One key difference not yet mentioned is that while sleeping a Thread does not release the locks it holds, while waiting releases the lock on the object that wait() is called on.

synchronized(LOCK) {

    Thread.sleep(1000); // LOCK is held

}

synchronized(LOCK) {

    LOCK.wait(); // LOCK is not held

}

C TUTORIAL

C PROGRAMS

INTERVIEW TESTS

EXECUTE CODE

C++ TUTORIAL

C++ PROGRAMS

INTERVIEW TESTS

EXECUTE CODE

PYTHON TUTORIAL

PYTHON HOW TOS

INTERVIEW TESTS

EXECUTE CODE

JAVA TUTORIAL

JAVA CODE EXAMPLES

SPRING TUTORIAL

MORE IN JAVA

COMPUTER ARCHITECTURE

COMPUTER NETWORK

OPERATING SYSTEM

DBMS & SQL

PL/SQL

MongoDB

EXECUTE SQL

ANDROID DEVELOPMENT

GO LANGUAGE

LINUX

DOCKER

HTML TAGS (A to Z)

CSS REFERENCES

SASS/SCSS

KOTLIN

GAME DEVELOPMENT

PHP

GIT GUIDE

JAVASCRIPT

ADVANCED DSA

What is the Difference between wait() and sleep()

2 Answers

Login / Signup to Answer the Question.