logo
  • About us
  • Services
  • Products
  • Work
  • Contact

Feedback

In Focus

  • Flash XML slideshow
  • Database training

4.1.36. Rules of Multimode locks

  • Must hold read/write_lock to read
  • Must hold write_lock to write
  • Must unlock after all access
  • Cannot upgrade/downgrade locks
    • Cannot request new lock while holding one
  • Upgrading permissable (read lock to write)
    • if currently holding sole read access
  • Downgrading permissable (write lock to read)
    • if currently holding write lock
‹ 4.1.35. Definitionup4.2. Concurrency protocols ›
  • s5 slideshow
 

 

 

Copyright 2007 Lightenna Limited

  • About us
  • Services
  • Products
  • Work
  • Contact