This function only needs to be ran once per second when epoll is

enabled because all it does then is send pings and check timeouts
which are calculated by the second.

toxcore/TCP_server.c

@@ -1031,6 +1031,13 @@ static void do_TCP_unconfirmed(TCP_Server *TCP_server)
 
 static void do_TCP_confirmed(TCP_Server *TCP_server)
 {
+#ifdef TCP_SERVER_USE_EPOLL
+
+    if (TCP_server->last_run_pinged == unix_time())
+        return;
+
+    TCP_server->last_run_pinged = unix_time();
+#endif
     uint32_t i;
 
     for (i = 0; i < TCP_server->size_accepted_connections; ++i) {

toxcore/TCP_server.h

@@ -110,6 +110,7 @@ typedef struct {
 
 #ifdef TCP_SERVER_USE_EPOLL
     int efd;
+    uint64_t last_run_pinged;
 #endif
     sock_t *socks_listening;
     unsigned int num_listening_socks;