[lwip-devel] [patch #5960] Enable multithread send/recv operations on same socket on TCP netconns

[Frédéric Bernon]

Follow-up Comment #37, patch #5960 (project lwip):

Some answers are in comment#31:

>Where would you add the sys_sem_signal(apimsg->msg.conn->apisem)?
"in "tcpip.c", lock the connection to protect concurrent access in
"tcpip_apimsg()", adding a sys_sem_wait(apimsg->msg.conn->apisem) and a
sys_sem_signal(apimsg->msg.conn->apisem)."

>When/How would it be initialized?
in netconn_new_with_proto_and_callback(), if LWIP_API_MULTITHREAD_PROT=1

>Would it be one apisem for all netconns or one per thread? (if one per
netconn, that would be the same as what we have now, wouldn't it?)
it's one per connection(netconn), but I don't understand "would be the same
as what we have now"? Which one? "sys_sem_t sem;" in "struct netconn"? It
it's this one, it is not used for that (I suppose it's mainly used in "write"
and "close" to avoid to consumne cycles to check a state).




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