The ServerWindow now keeps the desktop (read) lock for up to 70 messages at once.

This should make drawing a bit smoother.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15515 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/app/ServerWindow.cpp

@@ -2168,25 +2168,37 @@ ServerWindow::_MessageLooper()
 			printf("ServerWindow %s: lock acquisition took %Ld usecs\n", Title(), diff);
 #endif
 
+		int32 messagesProcessed = 0;
+		bool lockedDesktop = false;
+
+		while (true) {
 			if (code == AS_DELETE_WINDOW || code == kMsgQuitLooper) {
 				// this means the client has been killed
 				STRACE(("ServerWindow %s received 'AS_DELETE_WINDOW' message code\n",
 					Title()));
 
+				if (lockedDesktop)
+					fDesktop->UnlockSingleWindow();
+
 				quitLoop = true;
 
 				// ServerWindow's destructor takes care of pulling this object off the desktop.
 				if (!fWindowLayer->IsHidden())
 					CRITICAL("ServerWindow: a window must be hidden before it's deleted\n");
-		} else {
+				
+				break;
+			}
+
+			if (!lockedDesktop) {
+				// only lock it once
 				fDesktop->LockSingleWindow();
+				lockedDesktop = true;
+			}
 
 			if (atomic_and(&fRedrawRequested, 0) != 0)
 				fWindowLayer->RedrawDirtyRegion();
 
 			_DispatchMessage(code, receiver);
-			fDesktop->UnlockSingleWindow();
-		}
 
 #ifdef PROFILE_MESSAGE_LOOP
 			if (code >= 0 && code < AS_LAST_CODE) {
@@ -2202,6 +2214,24 @@ ServerWindow::_MessageLooper()
 			}
 #endif
 
+			// only process up to 70 waiting messages at once (we have the Desktop locked)
+			if (!receiver.HasMessages() || ++messagesProcessed > 70) {
+				fDesktop->UnlockSingleWindow();
+				break;
+			}
+
+			status_t status = receiver.GetNextMessage(code);
+			if (status < B_OK) {
+				// that shouldn't happen, it's our port
+				printf("Someone deleted our message port!\n");
+				fDesktop->UnlockSingleWindow();
+
+				// try to let our client die happily
+				NotifyQuitRequested();
+				break;
+			}
+		}
+
 		Unlock();
 	}