TCP: Add more connection debug logs from TCP workers

lib/dbg/struct_hist.h

@@ -54,6 +54,7 @@
 #define SH_ALL_VERBS(VERB_FUN) \
 	VERB_FUN(TCP_SEND2CHILD) \
 	VERB_FUN(TCP_SEND2MAIN) \
+	VERB_FUN(TCP_ADD_READER) \
 	VERB_FUN(TCP_REF) \
 	VERB_FUN(TCP_UNREF) \
 	VERB_FUN(TCP_DESTROY) \

net/net_tcp_proc.c

@@ -110,6 +110,8 @@ int tcp_done_reading(struct tcp_connection* con)
 		tcpconn_check_del(con);
 		tcpconn_listrm(tcp_conn_lst, con, c_next, c_prev);
 		if (con->fd!=-1) { close(con->fd); con->fd = -1; }
+		sh_log(con->hist, TCP_SEND2MAIN,
+			"parallel read OK - releasing, ref: %d", con->refcnt);
 		tcpconn_release(con, CONN_RELEASE, 0, 1 /*as TCP proc*/);
 
 		_tcp_done_reading_marker = 1;
@@ -285,6 +287,9 @@ inline static int handle_io(struct fd_map* fm, int idx,int event_type)
 					goto con_error;
 				}
 
+				sh_log(con->hist, TCP_ADD_READER, "add reader fd %d, ref: %d",
+				       s, con->refcnt);
+
 				/* mark that the connection is currently in our process
 				future writes to this con won't have to acquire FD */
 				con->proc_id = process_no;