some structure feilds

hi all
I read the squid code and try to understand the structure feilds but these are the feilds that i can't find out them. whould you please help me about the meaning of them?
1-in StoreEntry :
                    lock_count
                    swap_status(SWAPOUT_NONE,SWAPOUT_WRITING,SWAPOUT_DONE)
                    ping_status(PING_NONE,PING_WRITING,PING_DONE)
                    store_status(STORE_OK,STORE_PENDING)

2-in MemObject:
                    in swapout:
                                    *memnode
                                    sio
                    start_ping
                    *ping_reply_callback
                    *ircb_data
                    in abort:
                                    STABH *callback
                                    void *data
                    int id

3-in HttpStateData:
                    reply_hdr_state
                    *orig_request
                    int fd
                    FwdState *fwd
  
4- about the external proccess "pinger" the only thing that i know is that to measure RTT ,pinger send icp message and receive icp reply and by results measure RTT. is it true? i want to know that are feilds in 3th above structures that containing ping in their name related to pinger proccess?

thanks in advance.
Received on Thu Oct 18 2001 - 00:16:30 MDT