apr_socket* server takes up more and more RES as it runs.

[GHui]

I use apr_pollset_poll and apr_socket_accept to accept short client connect. 
Only one client connects it every second. The RES increase from 3068 to 33m 
when it runs for about 12 hours, and VIRT is 2106m when the program starts. If 
there is no client connect, the RES doesn't rise.

Any help will be appreciated. GHui