[zeromq-dev] ØMQ VSM data alignment

Pieter Hintjens ph at imatix.com
Wed Aug 4 19:09:09 CEST 2010


I don't think this has been covered.  It would be sensible to have
vsm_data aligned but it's something that is IMO worth testing rather
than doing on faith.


> Sorry if this has been covered before.
> I've been using zmq to transport raw structures, and I've noticed that
> zeromq apparently does not provide appropriate alignment for messages in
> VSMs, and maybe for larger messages as well if you're using the front of the
> content buffer (I haven't looked :-( )
> Here are the offsets:
> 0x00    void *content;
> 0x08    unsigned char flags;
> 0x09    unsigned char vsm_size;
> 0x0a    unsigned char vsm_data [ZMQ_MAX_VSM_SIZE];
> Shouldn't vsm_data be padded to 0x10 on 64 bit architectures (and maybe
> others)?
> Thanks,
> Matt
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