HDS file locking is not currently implemented on UNIX systems. This means that any number of processes may access a container file simultaneously. This should not be allowed to happen, however (apart from shared read access), because modifications to the file will not be propagated consistently between the file and the separate processes. The result will be a corrupted container file and/or hung or crashed processes.
Note that HDS supports access to container files over the Network File System (NFS), but does not provide file locking.
HDS [1ex