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| Colorimetric evaluation of photographic film |
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Process monitoring in a computer system
| Details |
Inventors: Brown, Roger S.; Roles, Karen C.; Applebaum, Simon G.;
Assignee: Sun Microsystems, Inc. (Santa Clara, CA)
Primary Examiner: Barlow; John
Assistant Examiner: Dougherty; Anthony
Attorney, Agent or Firm: Meyertons Hood Kivlin Kowert & Goetzel, P.C., Kivlin; B. Noel
The health of a process is monitored in a computer system by a process monitor. The monitored process (a configuration management system daemon (CMSD)) is not a child of the process monitor. The process monitor uniquely determines the identity of a monitored process and verifies the correct operation of the monitored process. In the absence of verification of the correct operation of the monitored process, the monitored process is caused to initiate. On successful initiation of the monitored process, the monitored process is uniquely identified to the system and is detached from the process monitor. Each monitored process is arranged to write, on initiation, its unique process identification information (PID) to a file, which file is then accessed by the process monitor to identify the process monitor. The process monitor can interrogate the operating system to verify correct operation of the CMSD. As an alternative, the process monitor could test whether the CMSD is functioning by making service requests to the CMSD. |
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DETAILED DESCRIPTION Particular and preferred aspects of the invention are set out in the accompanying independent and dependent claims.
Combinations of features from the dependent claims may be combined with features of the independent claims as appropriate and not merely as explicitly set out in the claims.
In accordance with one aspect of the invention, there is provided a method of monitoring by a process monitor of a process in a computer system, where the monitored process is not a child of the process monitor.
The process monitor uniquely determines the identity of a monitored process and verifies the correct operation of the monitored process.
In the absence of verification of the correct operation of the monitored process, the monitored process is caused to initiate (to restart).
On successful restarting of the monitored process, the monitored process is uniquely identified to the system.
In accordance with another aspect of the invention, there is provided a method of initiating a process to be monitored in a computer system.
The method of initiating a process to be monitored comprises the spawning of a new process by, for example, an upgrade version of an existing process, and then the new process checking that it is operable.
In response to a positive result to the tests, the monitored process uniquely identifies itself to the computer system and causes the existing monitored process to terminate, whereby the new process becomes the monitored process.
In accordance with a further aspect of the invention, there is provided a computer system comprising a process to be monitored, the process to be monitored being configured, on successful initiation (starting), uniquely to identify itself to the system, and a process monitor configured: uniquely to determine to identity of a monitored process; to verify correct operation of the monitored process; and, in the event of being unable to verify correct operation of a monitored process, to cause the monitored process to initiate (to restart)
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