September 2013
Intermediate to advanced
548 pages
12h 25m
English
Content preview from Programming Erlang, 2nd Edition
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Programming for Fault Tolerance
In this section, you’ll learn a few simple techniques that can be used to make fault-tolerant code. This is not the whole story of how to make a fault-tolerant system, but it is the start of a story.
Performing an Action When a Process Dies
The function on_exit(Pid, Fun) watches the process
Pid and evaluates Fun(Why) if the process
exits with the reason Why.
| lib_misc.erl | |
| Line 1 | on_exit(Pid, Fun) -> |
| 2 | spawn(fun() -> |
| 3 | Ref = monitor(process, Pid), |
| 4 | receive |
| 5 | {'DOWN', Ref, process, Pid, Why} -> |
| 6 | Fun(Why) |
| 7 | end |
| 8 | end). |
monitor(process, Pid) (line 3) creates a monitor to
Pid. When the process dies, a DOWN message is
received (line 5) and calls
Fun(Why) (line 6).
To test this, we’ll define ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.