[lwip-devel] [task #14420] Remove sys_sem_signal from inside SYS_ARCH_PROTECT crit section

[Joel Cunningham]

Update of task #14420 (project lwip):

        Percent Complete:                    100% => 90%                    
             Open/Closed:                  Closed => Open                   

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Follow-up Comment #8:

I was auditing the changes for this task again and I believe there is an
outstanding synchronization issue for the TCPIP_CORE_LOCKING case.

The premise of the change was that the core lock would be held when
event_callback is executed and then select code in sockets.c could use the
core lock to also protect select_cb_list

The problem is there are some places where event_callback (called via
API_EVENT) is not within core locking code.

These are for cases where sockets/netconn is taking things from their mboxes. 
Here's the list I'm seeing:

netconn_accept
netconn_recv_data
netconn_recv_data_tcp

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