File Locking to prevent "race condition" question

[Sbob]

All;

We have a database failover process in place that leverages a component 
that will also do load balancing. For reasons due to the client's 
environment we want n+ (many) of these load balancing components, 
however this means we will have many failover scripts on different 
servers that will all want to force a failover at the same time if a 
failure occurs.

Question: will flock() properly lock a file in a way that incoming 
commands over ssh from multiple other servers will respect the lock?

Thanks in advance