☜	OMI - Complex Locks Draft MDC Standard					☞

4.3.4 Complex locks

A client may lock a list of nrefs that lie on different OMI nodes. The lock operation is atomic – it shall succeed only if all nrefs in the list are successfully claimed. This property, combined with the isolated transactions between the agent and its servers, requires the agent to assemble a complex lock from OMI lock requests to the respective servers.

The agent shall claim all nrefs of a complex lock. If all the claims succeed, then the entire lock succeeds. Otherwise, the agent shall release its successful claims and repeat the procedure until the lock succeeds or times out.

NOTE – To facilitate this procedure, the protocol defines a request to unlock all nrefs held by a client on 1 server.

Copyright © Standard Documents; 1977-2024 MUMPS Development Committee;
Copyright © Examples: 1995-2024 Ed de Moel;
Copyright © Annotations: 2003-2008 Jacquard Systems Research
Copyright © Annotations: 2008-2024 Ed de Moel.

Some specifications are "approved for inclusion in a future standard". Note that the MUMPS Development Committee cannot guarantee that such future standards will indeed be published.

This page most recently updated on 13-Sep-2014, 14:33:31.

For comments, contact Ed de Moel (demoel@jacquardsystems.com)