[zeromq-dev] Question on atomic_counter

[Matt Weinstein]

Of course don't this on a Univac 1100 ... :-)

http://www.fourmilab.ch/documents/univac/minuszero.html


On Aug 5, 2010, at 9:48 PM, Steven McCoy wrote:

> On 6 August 2010 01:51, Stewart Douglas <sdouglas at snowgold.com> wrote:
> Running on a Ubuntu 64 bit on a Xeon processor , I believe the code  
> below will be what executes. integer_t is a typedef for uint32_t, so  
> the assignment to -decrement seems wrong to me - the zmq code is  
> always calling sub with a parameter of one, to reduce the reference  
> count by one in a zmq_msg_close() and pub_t::xsend().
>
> So am puzzled how this is working ? Should oldval be an int32_t  
> rather than uint32_t ?
>
>
> With finite field math, (uint8_t)-1 == (uint8_t)255, the sign is no  
> longer relevant as you take advantage of the wrapping around zero.
>
> There is an entire field of math devoted to it, and forms the basis  
> of many DSP operations, etc.
>
> -- 
> Steve-o
>
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