Re: [lwip-users] Freeing memory after http transfer

[Bernhard 'Gustl' Bauer]

address@hidden schrieb:
> Bernhard 'Gustl' wrote:
> > tcp_write is used in my copy too.
>
> Of course it is. The question is whether you pass TCP_WRITE_FLAG_COPY or 
> zero as 4th argument to tcp_write(). If you pass TCP_WRITE_FLAG_COPY, 
> data is copied from the pointer you pass to internal buffers which are 
> freed when ACKed. If you pass zero, data is sent directly from the 
> pointer you supplied ("zero copy").
>
> In the first case (FLAG_COPY), you can free your buffer after passing it 
> to tcp_write(), whereas in the latter (zero), you have to keep the 
> buffer unchanged and allocated until the accumulated count from 
> http_sent() tells you all data has been ACKed.

The 4th argument is zero. This is fine with me as I don't want to waste 
time copying data.

I'm not sure if the http_sent of version 1.3.0 is correct. It tries to 
close the connection before all data is ACKed.

I had a short look at the actual CVS and I think it may have the same 
problems. You may want to check this.

I will count the ACKed data which will solve my problem.

Thanks for your help

Gustl