LJ::get_lock — get a mysql lock on a given key/dbrole combination
LJ::get_lock(db, dbrole, lockname, wait_time);
db.
dbrole. the role this lock should be gotten on, either 'global' or 'user'
lockname. the name to be used for this lock
wait_time. an optional timeout argument, defaults to 10 seconds
cgi-bin/ljlib.pl
undef if called improperly, true on success, die() on failure