[erlang-questions] Re: about a tcp question in erlang

余超 <>
Thu Mar 31 09:15:55 CEST 2011


于 2011/3/31 15:04, Joe Armstrong 写道:
>
>
> On Tue, Mar 29, 2011 at 5:45 AM, zhangbo < 
> <mailto:>> wrote:
>
>     Hi,
>            Code:
>            {ok, Listen} = gen_tcp:listen(80, [{packet,0},
>                                            binary,
>                                            {active, true}])
>
>            Loop:
>                    receive
>                            {tcp, S, Bin} ->
>                                    ...
>
>     I want to know, when a client send a message("helloworld") to
>     server, then send another message("helloworld2"). How many
>     messages will the server receive? (I guess 2.)  If the client send
>     very fast, or the message is big enough, how the situation again?
>
>     When receive {tcp, S, Bin}, Bin stands for a message or maybe just
>     a fragment of message? If the client send "hello, server", Bin
>     maybe "hello, server", but If the message is very big, what will
>     Bin be? and how many times will the loop receive?
>
>
> because you have said {packet,0} then data might become fragmented. 
> The options {packet,2}, (or {packet,4} mean "send a 2(4) byte length 
> header at the start of the data". If the client and server
> both open a socket with {packet,4} then any fragmentation will be 
> taken care of by the tcp driver. In this
> case any packet fragments will be recombined by the driver and only 
> completed messages delivered to
> the application.
>
> /Joe
>
>
>
>
>
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Joe:
nice!
thanks

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