[lwip-devel] [bug #21049] Allow reuse of pbufs after return from APIs

[Jonathan Larmour]

Follow-up Comment #2, bug #21049 (project lwip):

The problem is that most people won't be interested in reusing pbufs. The
socket layer won't for example. So we shouldn't add overhead for a usually
unnecssary operation.

A user-created pre-filled pbuf could have been changed in many ways. The
payload pointer could have been changed arbitrarily. The only way you could
guarantee reuse of the contents is to copy the pbuf and payload every time no
matter what. That's too painful.

I think if you really want to reuse pbuf data, you should be using a
PBUF_REF. Otherwise we should draw the line.


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