[Freeciv-Dev] patch to add synchronous game turns

[Gary Moyer <garymoyer@xxxxxxxx>]

Greetings!

I've modified the server adding a synchronous game turn option.

With this option enabled the game turn does not advance until all
players have completed their turn.  This is handy for games which are
played over a long period of time enabling players to disconnect and
reconnect without fear of losing turns.

This patch is applicable to version 1.8.1 of the codeline.

-- Gary


--- civserver.c 1999/08/18 18:13:34     1.1
+++ civserver.c 1999/08/19 02:35:28
@@ -128,6 +128,30 @@
 
 int rand_init=0;
 
+/* global flag to detect synchronous game play */
+int syncplay=0;
+
+/*
+ * check to see if all players have moved.
+ * returns 1 if true, 0 otherwise
+ */
+int all_players_done()
+{
+       int i;
+
+
+       /* determine whose turn it is */
+    for(i=0; i<game.nplayers; i++) {
+               if (!game.players[i].ai.control && !game.players[i].turn_done)
+               {
+                       return 0;
+               }
+       }
+
+       return 1;
+}
+
+
 /**************************************************************************
 ...
 **************************************************************************/
@@ -455,8 +479,20 @@
     ai_start_turn();
 
     freelog(LOG_DEBUG, "sniffingpackets");
-    while(sniff_packets()==1);
-    
+
+       /* if synchronous game play wait until all players have moved */
+       if (syncplay)
+       {
+               while(!all_players_done())
+               {
+                       sniff_packets();
+               }
+       }
+       else /* normal mode */
+       {
+               while(sniff_packets()==1) ;
+       }
+
     for(i=0;i<game.nplayers;i++)
       connection_do_buffer(game.players[i].conn);
     freelog(LOG_DEBUG, "Autosettlers");
--- stdinhand.c 1999/08/19 02:25:08     1.1
+++ stdinhand.c 1999/08/19 02:31:13
@@ -40,6 +40,7 @@
 
 extern int gamelog_level;
 extern char metaserver_info_line[256];
+extern int syncplay;
 
 enum cmdlevel_id default_access_level = ALLOW_INFO;
 
@@ -466,6 +467,13 @@
     "  Only applies if the game log feature is enabled (with the -g command 
line\n"
     "  option).  Levels: 0=no logging, 20=standard logging, 30=detailed 
logging,\n"
     "  40=debuging logging." },
+
+  { "syncplay", &syncplay,
+       SSET_META, SSET_SERVER_ONLY,
+       0,1,0,
+       "Synchronous game play",
+       "  If this is set to 1 game turn is not advanced until\n"
+       "  all players have finished their turns."},
   
   { NULL, NULL,
     SSET_LAST, SSET_SERVER_ONLY,