Hi,
I got some qs on timer functions on lwip, read some thread on it previously but
it doesnt really answer my qs.
I ll try to generalize this so that any future user can use this thread for the
same problem.
Im using lwip 1.2 porting it on a SMX OS on PowerPC MPC852T. Just wanna make
sure I am right before i run some multithreading test.
1. The are 2 timers for the whole stack, which are the arptimer and the tcp
timer am I right ?
2. The arptimer is initialized in ethernetif_init through this piece of code :
sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
which then will be assign a struct timeout to the tcpip thread's timeout (since
I call it from the tcpip thread initialization) linked list and will be checked
and updated each time I wait on semaphore or fetch a message. Hence I dont have
to call the arptimer().
Am I correct so far ?
3. My biggest problem is the tcp_timer. It is called by the tcpip_tcp_timer by
tcpip API. But no other function calls the tcpip_tcp_timer
hence I guess I need to call it myself ? If I do have to call it myself, I
guess there are 2 ways. One is I call it before I wait for semaphore after
tcpip_thread finishes the job
it got with the message it fetched. Or call another thread to call
tcpip_tcp_timer which is literally bad cause the stack itself is not
multithreading safe, isnt it?
If anyone has done something like this and has tips where I can use the timer
safely, I'd appreciate any tips.
4.I am writing a telnet server program which have 2 task, both using the same
socket for transmit and receive. This is possible if i do a critical section
protection each time
the socket does receive or send, preventing simultaneous access on the socket,
am I right ?
I am thankful for any answers you could provide me.
Greetings,
Ikhwan
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