[erlang-questions] suspending/resuming a process

[Martin Dimitrov]

Thanks. I can't detach from my C background.


On 12/3/2013 3:13 PM, Dmitry Klionsky wrote:
> The sys module doesn't work with any processes, but only with those
> implemented using behaviours or the special processes implemented using
> proc_lib.
> http://www.erlang.org/doc/design_principles/spec_proc.html
> 
> 
> On 12/03/2013 04:05 PM, Martin Dimitrov wrote:
>> Hello,
>>
>> I am trying to figure out how to use sys:suspend/1,2 and sys:resume/1,2
>> but without any luck.
>>
>> I tried:
>>
>> 1> P = spawn(fun() -> lists:foreach(fun(_) -> io:format("cool~n", []),
>> timer:sleep(1000) end, lists:seq(1, 100)) end).
>> 2> sys:suspend(P).
>>
>> but the process clearly continued to run because was printing "cool"
>> every second.
>>
>> After 5 seconds (which is the default timeout for sys:suspend/1,2, I
>> guess), I got the following error:
>>
>> ** exception exit: {timeout,{sys,suspend,[<0.176.0>]}}
>>       in function  sys:send_system_msg/2 (sys.erl, line 242)
>>
>> Thank you very much,
>>
>> Martin
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> 
>