Re: FAM based fswatcher - first try

[Enrico Sersale]

On 2007-01-24 19:05:01 +0200 Philippe Roussel <address@hidden> wrote:

> Hi all
>
> You will find attached a implementation of fswatcher using the FAM
> API. It should link either with FAM (1) or gamin (2), which are
> available on different flavors of unix. The goal is to take advantage
> of existing facilities and getting rid of timers. FAM and gamin use
> kernel helpers to avoid polling when they can.
>
> The code probably has some bugs and I'm not sure I followed exactly
> the different notifications semantics but it's a start. I tested it
> with GWorkspace and it seems to work well.
>
> Opinions ?

The original fswatcher doesn't create a new Watcher object if there already is one for a 
path beeing added; it adds only a "listener", that is, it increments a counter. 
When, removing all listeners, the counter becomes 0, the Watcher object is removed from 
the watchers array.

> Philippe
>
> NB : fswatcher parameter '--daemon' results in the opposite, or I am
> missing something ?

'--daemon' is not intended to be used from the command line; it is only an 
internal way to create a daemon using only NSTask instead of fork(); many 
GNUstep daemons does this; gdnc, gpbs, etc.

> 1 - http://oss.sgi.com/projects/fam/
> 2 - http://www.gnome.org/~veillard/gamin/