October 2014
Intermediate to advanced
280 pages
7h 20m
English
Content preview from Programming Elixir
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When Processes Die
Who gets told when a process dies? By default, no one. Obviously the VM knows and can report it to the console, but your code will be oblivious unless you explicitly tell Elixir you want to get involved.
Here’s the default case: we spawn a function that uses the Erlang timer library to sleep for 500 ms. It then exits with a status of 99.
The code that spawns it sits in a receive. If it receives a message, it reports that fact; otherwise, after one second it lets us know that nothing happened.
| spawn/link1.exs | |
| | defmodule Link1 do |
| | import :timer, only: [ sleep: 1 ] |
| | |
| | def sad_function do |
| | sleep 500 |
| | exit(:boom) |
| | end |
| | def run do |
| | Process.flag(:trap_exit, true) |
| | spawn(Link1, :sad_function, []) |
| | receive ... |
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