Re: epoll (was Re: [PATCH] async poll for 2.5)

[John Myers]

Charles 'Buck' Krasic wrote:

>Or we could have (to make John happier?):
>
>1 for(;;) {
>2      fd = event_wait(...);
>3      if(fd == my_listen_fd) {
>4           /* new connections */
>5           while((new_fd = my_accept(my_listen_fd, ...) != EAGAIN)) {
>6*                  epoll_addf(new_fd, &pfd, ...);
>7*                  if(pfd.revents & POLLIN) {
>7*                      while(do_io(new_fd) != EAGAIN);
>8*                  } 
>8           }
>9       } else {
>10           /* established connections */
>11           while(do_io(fd) != EAGAIN)
>12      }
>13 }
>  
>
Close.  What we would have is a modification of the epoll_addf() 
semantics such that it would have an additional postcondition that if 
the new_fd is in the ready state (has data available) then at least one 
notification has been generated.  In the code above, the three lines 
comprising the if statement labeled "7*" would be removed.