Re: halt with timing

Jan, thank you for the answer!

My prolog code works as a server, but after a few queries it is not needed
anymore, so i want to shut down automatically.

regards,
Gábor






On Fri, Dec 6, 2013 at 3:47 PM, Jan Wielemaker <[email protected]> wrote:

> On 12/06/2013 03:05 PM, Gabor Monostori wrote:
>
>> Hi there,
>>
>> I made something simple and became puzzled, can you help me?
>>
>> I put the following lines into pl.ini
>>
>> :- write('Hello World'),
>>     alarm(2,halt,Id,[]).
>>
>> If i start swipl-win.exe(Wind7) the code works; after two seconds the
>> window is closed.
>>
>> If i start swipl.exe after two seconds the console is still there, but if
>> i
>> want to do something after typing new line and pressing 'Enter' the
>> console
>> closes. Here I expected the window to be closed also promptly.
>>
>> Is this a bug, side effect or I do smt wrongly?
>>
>
> Many blocking system calls do not process the alarm event.  Worse,
> this set varies from OS to OS.  Alarm events are mostly useful for
> interrupting long computations.  On some streams (again depending
> on the OS) you can set a read timeout using set_stream/2.  The only
> guarantee here is that this works on sockets on all platforms.
>
> So, for what are you planning to use alarms?
>
>         Cheers --- Jan
>
>
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