Jeffrey " writes:

> For the part of my routines BackupPC_fixLinks and BackupPC_deleteFile
> that actually try to make new links (or delete old ones), I would like
> to make sure that nothing else is creating or deleting links to the
> pool to avoid collisions.
> 
> Specifically, I would like to be able to do the following:
> 1. Query the server whether it is free
> 2. If free tell the server to not launch anything else (i.e place
>    equivalent of lock file)
> 3. Tell server when it can go back to launching other things
>    (i.e. remove lock file).
> 
> I assume that BackupPC_nightly and BackupPC_link must do similar
> things but I couldn't quite figure out how.

First this should be on the devel rather than user list.

The BackupPC server maintains queue (CmdQueue) for commands
that need to be run one-at-a-time (currently BackupPC_link).
The BackupPC_nightly policy is hardcoded (ie: first wakeup
when current command from CmdQueue is done).  So you could
add a server message that adds your command to CmdQueue
and it will be run serially with other BackupPC_links
and not overlap BackupPC_nightly.

Craig

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