From: H.G.Muller <hgm@hgm-xboard.(none)>
Date: Sat, 11 Oct 2014 09:51:07 +0000 (+0200)
Subject: Attempt to fix getting trapped in ponder mode
X-Git-Url: http://winboard.nl/cgi-bin?p=hachu.git;a=commitdiff_plain;h=73f8d53961524d71089ad54b1549a953efa0fe14

Attempt to fix getting trapped in ponder mode

HaChu was sometimes trapped in its ponder search, because the pending
input that should wake it up out of ponder (i.e. the opponent's move)
had been read from the pipe to the input buffer, hiding it from the
test for pending input. Buffering linewise might prevent commands
to be buffered before HaChu actually starts to read them.
---

diff --git a/hachu.c b/hachu.c
index 52355e8..fdf5bb4 100644
--- a/hachu.c
+++ b/hachu.c
@@ -2646,16 +2646,18 @@ printf("# ponder hit\n");
 
     main()
     {
-      int engineSide=NONE;                     // side played by engine
+      int engineSide=NONE;                // side played by engine
       MOVE move;
       int i, score, curVarNr;
 
-  Init(V_CHU); // Chu
+      setvbuf(stdin, NULL, _IOLBF, 1024); // buffering more than one line flaws test for pending input!
+
+      Init(V_CHU); // Chu
       seed = startTime = GetTickCount(); moveNr = 0; // initialize random
 
       while(1) { // infinite loop
 
-        fflush(stdout);                 // make sure everything is printed before we do something that might take time
+        fflush(stdout);                   // make sure everything is printed before we do something that might take time
         *inBuf = 0; if(moveNr >= 20) randomize = OFF;
 //if(moveNr >20) printf("resign\n");