NIO+Multithreaded TCPSocket listener, very low cpu utilisation

[Daniel Kozak]

It works for me because I have multiple threads, but when I use only one
thread per pool (defaultPoolThreads(1)), it obviosly blocks, which is
correct behavior

On Thu, Nov 16, 2017 at 7:20 PM, Daniel Kozak <kozzi11 at gmail.com> wrote:

> Hmm works ok for me. What OS?
>
> Dne 16. 11. 2017 12:05 dop. napsal uživatel "kdevel via
> Digitalmars-d-learn" <digitalmars-d-learn at puremagic.com>:
>
> On Wednesday, 15 November 2017 at 13:31:46 UTC, Daniel Kozak wrote:
>>
>>> This one works ok for me, but I am on linux:
>>> https://dpaste.dzfl.pl/f54decee45bc
>>>
>>
>> It works, but it does not handle two connects in parallel. STR:
>>
>> 1. start the binary in console 1
>> 2. telnet localhost 4444 in console 2
>> 3. telnet localhost 4444 in console 3
>> 4. enter a [RETURN] in console (3)
>>
>> observed: nothing (the "thread" handling the first connect blocks)
>> expected: response
>>
>> On my machine defaultPoolThreads() returns 1. This can easily be
>> increased:
>>
>> ```
>>    defaultPoolThreads(8);
>> ```
>>
>> There is also another problem with Socket.select: It may return -1. This
>> frequently happens when the ACCEPT socket is non-blocking and the select is
>> interrupted (by the GC?) then errno == EINTR.
>>
>> Also not having a timeout in the Socket.select of handle_socket allows
>> for DOS attacks like the one above. In case of a timeout select also
>> returns -1.
>>
>
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