[nanomsg] Re: Richer API for manipulating zero-copy messages
- From: Achille Roussel <achille.roussel@xxxxxxxxx>
- To: "nanomsg@xxxxxxxxxxxxx" <nanomsg@xxxxxxxxxxxxx>
- Date: Tue, 13 May 2014 01:33:34 -0700
OK, I'll give it a shot over the weekend then.
Achille Roussel
+1 415 490 6339
> On May 13, 2014, at 1:01 AM, Martin Sustrik <sustrik@xxxxxxxxxx> wrote:
>
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> Hi Achille,
>
>> So the nn_reallomsg function should take in considerations the
>> value of the reference counter in a message (from reading a bit of
>> the nanomsg internal that's how I understand it works). In the case
>> the counter is not one it would simply allocate a new buffer and
>> copy the data.
>
> Ok. That makes sense. Are you going to implement that?
>
>> I'm wondering if there might be some race conditions here, unless
>> nanomsg increases the reference counter of a message before
>> delivering it to any socket (I guess so, otherwise there would be
>> races on nn_freemsg already).
>
> The reference counter is adjusted using atomic operations, so it
> should be thread-safe.
>>
>> That could also solve the issues raised in another thread about
>> requesting padding at the end of a message... If the padding is
>> small, in most cases the reallocation will simply change the
>> message size without actually copying any data.
>
> Yes. Unless, of course, the buffer is shared as discussed previously.
>
> Martin
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