From 3e9c10f9e11935a82d33fd5c66592d795c279777 Mon Sep 17 00:00:00 2001
From: planetmaker <planetmaker@openttd.org>
Date: Tue, 8 Apr 2014 20:19:41 +0000
Subject: (svn r26449) -Add: Allow more sound sleep for dedicated servers when
 there's nothing to do and nobody paying attention

---
 src/network/network.cpp   | 12 ++++++++++++
 src/network/network.h     |  2 ++
 src/video/dedicated_v.cpp | 10 +++++++++-
 3 files changed, 23 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/network/network.cpp b/src/network/network.cpp
index 57a6412c6..a3c8fd4a9 100644
--- a/src/network/network.cpp
+++ b/src/network/network.cpp
@@ -96,6 +96,18 @@ byte _network_clients_connected = 0;
 /* Some externs / forwards */
 extern void StateGameLoop();
 
+/**
+ * Return whether there is any client connected or trying to connect at all.
+ * @return whether we have any client activity
+ */
+bool HasClients()
+{
+	NetworkClientSocket *cs;
+	FOR_ALL_CLIENT_SOCKETS(cs) return true;
+
+	return false;
+}
+
 /**
  * Basically a client is leaving us right now.
  */
diff --git a/src/network/network.h b/src/network/network.h
index 3dd63d03c..26f94482e 100644
--- a/src/network/network.h
+++ b/src/network/network.h
@@ -18,6 +18,7 @@
 void NetworkStartUp();
 void NetworkShutDown();
 void NetworkDrawChatMessage();
+bool HasClients();
 
 extern bool _networking;         ///< are we in networking mode?
 extern bool _network_server;     ///< network-server is active
@@ -31,6 +32,7 @@ extern bool _is_network_server;  ///< Does this client wants to be a network-ser
 static inline void NetworkStartUp() {}
 static inline void NetworkShutDown() {}
 static inline void NetworkDrawChatMessage() {}
+static inline bool HasClients() { return false; }
 
 #define _networking 0
 #define _network_server 0
diff --git a/src/video/dedicated_v.cpp b/src/video/dedicated_v.cpp
index 8e5b9ea91..9be1b2d3c 100644
--- a/src/video/dedicated_v.cpp
+++ b/src/video/dedicated_v.cpp
@@ -316,7 +316,15 @@ void VideoDriver_Dedicated::MainLoop()
 		}
 
 		/* Don't sleep when fast forwarding (for desync debugging) */
-		if (!_ddc_fastforward) CSleep(1);
+		if (!_ddc_fastforward) {
+			/* Sleep longer on a dedicated server, if the game is paused and no clients connected.
+			 * That can allow the CPU to better use deep sleep states. */
+			if (_pause_mode != 0 && !HasClients()) {
+				CSleep(100);
+			} else {
+				CSleep(1);
+			}
+		}
 	}
 }
 
-- 
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