c - how to get client address in a multithreading TCP server for each connection -

in multithreading tcp server, don't know how store client address each cocnnection.

first, let's consider case in each thread, there 1 tcp connection(namely 1 connfd) @ same time.this client address used in each thread.

for multh-threading tcp server, there 3 types:

(1) 1 thread per connection, in type, can use thread-specific data store client address. like:

listen(listenfd, backlog); pthread_key_create(&key, null); for(;;){     connfd=accept(listenfd, client_addr, socklen);     pthread_create(pid, null, func, null);     ..  } 

and

func(){   pthread_setspecific(key,(void *)client_addr);   // **and client_addr can obtained pthread_getspecific(key)** } 

are there problem in solution? i'm afraid before pthread_setspecific() called, accept() called again , client_addr changed.

(2) half-syn , half-async: similar (1)

(3) leader-follower type:

 connfd=listen(listenfd, backlog);  pthread_key_create(&key, null);  for(i:n){      pthread_create(pid, null, func, null);  }   func(){       accept(listenfd, client_addr, socklen);       pthread_setspecific(key,(void *)client_addr);  } 

for type, still since client_addr may changed between accept() , pthread_setspecific().

for case each thread has many tcp connections @ same time, unimaginable!

so how can client address each thread? there work-around problem? thanks!

just call getpeername(2) on socket in handling thread, no need fancy thread-local storage.