September 2013
Intermediate to advanced
548 pages
12h 25m
English
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Monitors
Monitors are similar to links but with several significant differences.
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Monitors are unidirectional. If
AmonitorsBandBdies, thenAwill be sent an exit message but not the other way around (recall that links were bidirectional, so ifAandBwere linked, the death of either process would result in the other process being informed). -
When a monitored process dies, a “down” message and not an exit signal is sent to the monitoring process. This means that the monitoring process does not have to become a system process in order to handle errors.
Monitors are used when you want asymmetry in error handling; links are used when you want symmetric error handling. Monitors are typically used by servers to monitor the behavior of clients. ...
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