This week's book giveaway is in the Beginning Java forum.
We're giving away four copies of Get Programming with Java (MEAP only) and have Peggy Fisher on-line!
See this thread for details.
Win a copy of Get Programming with Java (MEAP only) this week in the Beginning Java forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Bear Bibeault
  • Knute Snortum
  • Liutauras Vilda
Sheriffs:
  • Tim Cooke
  • Devaka Cooray
  • Paul Clapham
Saloon Keepers:
  • Tim Moores
  • Frits Walraven
  • Ron McLeod
  • Ganesh Patekar
  • salvin francis
Bartenders:
  • Tim Holloway
  • Carey Brown
  • Stephan van Hulst

WHy isnt there an Output?  RSS feed

 
Ranch Hand
Posts: 32
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator


 
Bartender
Posts: 9564
189
  • Likes 2
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
You have created a deadlock. When you call b.start(), you essentially tell b to hold a lock on a, and then wait for the main thread to finish before it releases the lock on a. Meanwhile, the main thread sleeps for a second, and after that it asks a to do something. However, it requires a's lock, which is held by b. So it has to wait until b is done with a, while b is waiting for the main thread to finish. Deadlock.
 
Ranch Hand
Posts: 300
Eclipse IDE Firefox Browser Linux
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

This is classic example of deadlock where lock's are shared between multiple threads in random way without a particular order and which leads to deadlock.

to read more about deadlock in java see here http://javarevisited.blogspot.com/2010/10/what-is-deadlock-in-java-how-to-fix-it.html
 
Nothing? Or something? Like this tiny ad:
RavenDB is an Open Source NoSQL Database that’s fully transactional (ACID) across your database
https://coderanch.com/t/704633/RavenDB-Open-Source-NoSQL-Database
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!