Author: James Long
Date: 12:22:50 01/30/99
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On January 30, 1999 at 14:13:55, James Robertson wrote: >On January 30, 1999 at 13:50:22, Will Singleton wrote: > >>On January 30, 1999 at 11:54:18, James Robertson wrote: >> >>>I am trying to add compatibility with Winboard to allow it to interrupt a >>>search. I am looking at EXchess and Crafty's interrupt stuff, but it goes over >>>my head. Could somebody explain what is happening? Thanks! >>> >>>James >> >>Do you mean that you can't stop a search when you receive a message from >>winboard, or that you can't receive the msg while searching? >> >>Will > >I can't recieve a message from Winboard when I'm searching. > >James One solution is to spool off a thread to check for input. If a (valid) user move is received, switch a global variable to stop the pondering session (or set time_left if the user made the predicted move and you haven't been pondering long enough). Same goes for the regular search - when a valid command is received that requires the program to stop searching, switch that global variable (something like BOOL stop_search). At every node, check for stop_search == TRUE. If the condition is true, return 0 to back down through the root. The trick to using threads is setting the proper "priority," so that the input thread doesn't get any more processor time than it needs. This also renders any same machine matches useless, but they're pretty meaningless anyway. :-) --- James
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