Re: [lwip-commits] [SCM] lwIP - A Lightweight TCPIP stack branch, master, updated. master_at_STABLE-2_0_0-736-g10a5afe

[Joel Cunningham]

Dirk,

One way I thought we can implement tcpip_callback so that the function is not 
executed immediately for the core locking case would be to add the 
tcpip_callback_fn to a delayed queue and then execute the queued functions 
during UNLOCK_TCPIP_CORE. This would ensure the callback function is executed 
after the current core lock critical section is complete without having to 
context switch to the TCP/IP thread

One area that would benefit from this is the loopback netif output where we 
can't currently call back into the stack (for the core locking case) during the 
current output because of reentrancy problems in the TCP layer

Joel 

> On Jun 21, 2017, at 08:07, Dirk Ziegelmeier <address@hidden> wrote:
> 
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> The branch, master has been updated
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> - Log -----------------------------------------------------------------
> commit 10a5afeee7fdfd780452034860d4c1c42ead4228
> Author: Dirk Ziegelmeier <address@hidden>
> Date:   Wed Jun 21 15:07:20 2017 +0200
> 
>    Revert my last change to tcpip_callback() - it breaks the semantics of the 
> function.
>    The function previously returned after posting a message, which is a short 
> operation. Now it actually waits until the operation has completed - which 
> may take a long time. This may break user programs. So all that remains is 
> the cleanup separation in tcpip_callback() and tcpip_try_callback() :-(
> 
> -----------------------------------------------------------------------
> 
> Summary of changes:
> src/api/tcpip.c | 9 ---------
> 1 file changed, 9 deletions(-)
> 
> 
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