aspose file tools*
The moose likes Threads and Synchronization and the fly likes daemon Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login


Win a copy of The Java EE 7 Tutorial Volume 1 or Volume 2 this week in the Java EE forum
or jQuery UI in Action in the JavaScript forum!
JavaRanch » Java Forums » Java » Threads and Synchronization
Bookmark "daemon" Watch "daemon" New topic
Author

daemon

Syamsul Hussin
Ranch Hand

Joined: Feb 09, 2003
Posts: 59
hi, i was reading the API for thread. What is a daemon? how does it differ from normal threads? how can we use them and when should we use them? thanks


----------------------------------<br />SCJP 1.4
Michael Morris
Ranch Hand

Joined: Jan 30, 2002
Posts: 3451
Hi Syamsul,
A daemon is a term we get from Unix. It is essentially a process that runs in the background unbeknownst to the user, like rlogind. A Java daemon thread is a thread that will not prevent the JVM from exiting when all the non-daemon thread are finished. For example if Threads A and B are non-daemons and Threads C, D and E are daemons and no other threads are running, when Threads A and B finish, the JVM will exit. I personally like to set all worker threads to daemons so that there is no chance that they can prevent the JVM from exiting.
Michael Morris
[ March 07, 2003: Message edited by: Michael Morris ]
[ March 07, 2003: Message edited by: Michael Morris ]

Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius - and a lot of courage - to move in the opposite direction. - Ernst F. Schumacher
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: daemon