GNU bug report logs - #30066
'get-bytevector-some' returns only 1 byte from unbuffered ports

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Message #20 received at 30066 <at> debbugs.gnu.org (full text, mbox):

From: Nala Ginrut <nalaginrut <at> gmail.com>
To: Andy Wingo <wingo <at> igalia.com>
Cc: Ludovic Courtès <ludo <at> gnu.org>, 30066 <at> debbugs.gnu.org
Subject: Re: bug#30066: 'get-bytevector-some' returns only 1 byte from
 unbuffered ports
Date: Thu, 11 Jan 2018 01:43:34 +0800

Ah, thanks for that work!

On Thu, Jan 11, 2018 at 1:26 AM, Andy Wingo <wingo <at> igalia.com> wrote:
> On Wed 10 Jan 2018 17:58, Nala Ginrut <nalaginrut <at> gmail.com> writes:
>
>> hi Andy and Ludo!
>>
>> What if developers enabled suspendable-ports and set the port to non-blocking?
>> For example, in the non-blocking asynchronous server, I registered
>> read/write waiter for suspendable-ports. And save
>> delimited-continuations then yield the current task.
>> In this situation, get-bytevector-n! will read n bytes with several
>> times yielding by the registered read-writer, from the caller's
>> perspective, get-bytevector-n! will return n bytes finally no matter
>> how many times it's yielded.
>> But how about the get-bytevector-some? Should it block just once and
>> return the first time read m bytes then return?
>
> I think this is right.  At most one block.  FWIW we'd need to add
> support for get-bytevector-some to (ice-9 suspendable-ports) to get this
> to work.
>
> Andy

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