+lock operations
+...............
+
+Request object members:
+
+ "method": "lock", "steal", or "unlock" required
+ "params": [<id>] required
+ "id": <nonnull-json-value> required
+
+Response object members:
+
+ "result": {"locked": <boolean>} for "lock"
+ "result": {"locked": true} for "steal"
+ "result": {} for "unlock"
+ "error": null
+ "id": same "id" as request
+
+Performs an operation on a "lock" object. The database server
+supports an arbitrary number of locks, each of which is identified by
+a client-defined id (given in "params"). At any given time, each lock
+may have at most one owner.
+
+The locking operation depends on "method":
+
+ - "lock": The database will assign this client ownership of the
+ lock as soon as it becomes available. When multiple clients
+ request the same lock, they will receive it in first-come, first
+ served order.
+
+ - "steal": The database immediately assigns this client ownership
+ of the lock. If there is an existing owner, it loses ownership.
+
+ - "unlock": If the client owns the lock, releases it. If the
+ client is waiting to obtain the lock, cancels the request and
+ stops waiting.
+
+ (Closing or otherwise disconnecting a database client connection
+ unlocks all of its locks.)
+
+For any given lock, the client must alternate "lock" or "steal"
+operations with "unlock" operations. That is, if the previous
+operation on a lock was "lock" or "steal", it must be followed by an
+"unlock" operation, and vice versa.
+
+For a "lock" operation, the "locked" member in the response object is
+true if the lock has already been acquired, false if another client
+holds the lock and the client's request for it was queued. In the
+latter case, the client will be notified later with a "locked" message
+when acquisition succeeds.
+
+These requests complete and send a response quickly, without waiting.
+The "locked" and "stolen" notifications (see below) report
+asynchronous changes to ownership.
+
+The scope of a lock is a database server, not a database hosted by
+that server. A naming convention, such as "<db-name>:<lock-name>",
+can effectively limit the scope of a lock to a particular database.
+
+locked
+......
+
+Notification object members:
+
+ "method": "locked"
+ "params": [<id>]
+ "id": null
+
+Notifies the client that a "lock" operation that it previously
+requested has succeeded. The client now owns the lock named in
+"params".
+
+The database server sends this notification after the reply to the
+corresponding "lock" request (but only if the "locked" member of the
+response was false), and before the reply to the client's subsequent
+"unlock" request.
+
+stolen
+......
+
+Notification object members:
+
+ "method": "locked"
+ "params": [<id>]
+ "id": null
+
+Notifies the client that owns a lock that another database client has
+stolen ownership of the lock. The client no longer owns the lock
+named in "params". The client must still issue an "unlock" request
+before performing any subsequent "lock" or "steal" operation on the
+lock.
+
+If the client originally obtained the lock through a "lock" request,
+then it will automatically regain the lock later after the client that
+stole it releases it. (The database server will send the client a
+"locked" notification at that point to let it know.)
+
+If the client originally obtained the lock through a "steal" request,
+the database server won't automatically reassign it ownership of the
+lock when it later becomes available. To regain ownership, the client
+must "unlock" and then "lock" or "steal" the lock again.
+
git://git.onelab.eu / sliver-openvswitch.git / blobdiff