[zeromq-dev] question about message buffer

[Pieter Hintjens]

Very small messages (under 30 bytes at present) are copied around
rather than referenced.

-Pieter

On Mon, Mar 11, 2013 at 8:04 AM, Mohit Jaggi <mohitjaggi at gmail.com> wrote:
> Hmm...but messages are not sent in the context(I don't mean zmq context
> here) of the calling thread, right? So, how can one use stack variable for
> message object?
>
>
> On Sun, Mar 10, 2013 at 11:08 PM, Pieter Hintjens <ph at imatix.com> wrote:
>>
>> On Mon, Mar 11, 2013 at 12:39 AM, Mohit Jaggi <mohitjaggi at gmail.com>
>> wrote:
>>
>> > I understand, but the caller does not control if the message is stored
>> > in
>> > VSM or on heap(since choice is made inside zmq code). So zmq has to
>> > somehow
>> > copy the VSM before the message variable goes out of scope. Just want to
>> > confirm that zmq does that.
>> > Or is it not OK to use zmq_msg_t on stack and it should always be
>> > allocated
>> > on heap?
>>
>> You're over-thinking it. The VSM data is just a property of zmq_msg_t
>> like size and has the same scope / lifetime as the message object.
>>
>> You can use either stack or heap depending on your use case.
>>
>> -Pieter
>>
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>
>
>
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