From: H.G.Muller <hgm@hgm-xboard.(none)>
Date: Wed, 7 Jan 2015 16:50:20 +0000 (+0100)
Subject: Fix blocking of input in ponder games
X-Git-Tag: v2.3~32
X-Git-Url: http://winboard.nl/cgi-bin?p=uci2wb.git;a=commitdiff_plain;h=768046d29eff91d4afbcea23dcb2a623a6a747c9

Fix blocking of input in ponder games

The blocking of input during thinking did break pondering, as a ponder
miss also used pause = 2 to schedule ignoring of the 'bestmove' reply
to 'stop'. This now uses pause = 1 again, while after a ponder hit the
input thread is blocked after turning pause into 2, indicating the
'bestmove' is for real.
---

diff --git a/UCI2WB.c b/UCI2WB.c
index 856ada3..9f1ad06 100644
--- a/UCI2WB.c
+++ b/UCI2WB.c
@@ -157,7 +157,7 @@ void
 StopPonder(int pondering)
 {
 	if(!pondering) return;
-	pause = 2;
+	pause = 1;
 	fprintf(toE, "stop\n"); fflush(toE); DPRINT("# stop\n"); // note: 'pondering' remains set until engine acknowledges 'stop' with 'bestmove'
 	Sync(PAUSE); // wait for engine to acknowledge 'stop' with 'bestmove'.
 }
@@ -417,6 +417,7 @@ GUI2Engine()
 		    char *draw = drawOffer ? " draw" : ""; drawOffer = 0;
 		    pondering = 0; moveNr++; startTime = GetTickCount(); // clock starts running now
 		    fprintf(toE, "ponderhit%s\n", draw); DPRINT("# ponderhit%s\n", draw);
+		    fflush(toE); fflush(stdout); pause = 2; Sync(PAUSE); // block input during thinking
 		    goto nomove;
 		}
 		StopPonder(1);