From: H.G.Muller <hgm@hgm-xboard.(none)>
Date: Thu, 14 Jan 2016 13:36:47 +0000 (+0100)
Subject: Send ping in EditGameEvent
X-Git-Url: http://winboard.nl/cgi-bin?p=xboard.git;a=commitdiff_plain;h=b0a35cef0cbc3515748f83081884866caec9389e

Send ping in EditGameEvent

An EditGameEvent can interrupt tinking of an engine, and the engine
might or might not send back a move as a result of that thinking.
To solve this, a "force" command sent to an engine playing white or
black will now be followed by a "ping". (If supported, of course.)
---

diff --git a/backend.c b/backend.c
index a3a81ef..233fb8d 100644
--- a/backend.c
+++ b/backend.c
@@ -14974,6 +14974,11 @@ EditGameEvent ()
       case MachinePlaysBlack:
       case BeginningOfGame:
 	SendToProgram("force\n", &first);
+	if (first.usePing) { // [HGM] always send ping when we might interrupt machine thinking
+	  char buf[MSG_SIZ];
+	  snprintf(buf, MSG_SIZ, "ping %d\n", initPing = ++first.lastPing);
+	  SendToProgram(buf, &first);
+	}
 	SetUserThinkingEnables();
 	break;
       case PlayFromGameFile: