This package provides semi-portable access to hardware provided
atomic memory operations.  These might allow you to write code:

- That does more interesting things in signal handlers.
- Makes more effective use of multiprocessors by allowing you to write
  clever lock-free code.  Note that such code is very difficult to get
  right, and will unavoidably be less portable than lock-based code.  It
  ia also not always faster than lock-based code.  But it may occasionally
  be a large performance win.