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Re: [lwip-users] TCP not sending initial ACK

From: address@hidden
Subject: Re: [lwip-users] TCP not sending initial ACK
Date: Wed, 26 Aug 2009 18:02:52 +0200
User-agent: Thunderbird (Macintosh/20090812)

Chuck Kuecker wrote:
No, the LWIP timers are called from the main timer tick, and there are
no other threads. This is how LWIP is set up for the Luminary driver
library I am using, and it has always worked before.
So lwIP is running in the main thread and the timers are called from intterupt level?? If so, the people creating the port have done something wrong (unless they set up some own protected against concurrent access). The main principle is that the core of lwIP is *not* protected against concurrent access which is why all functions may only be called from one thread and not from interrupt context (except for some memory allocation functions and the API functions).
Wireshark shows no defective packets.
That's good to know. You could still check the stats (or enable debug output) to see if there's something going wrong inside the stack.


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