From 0df63f38249cbbc584d3a130773680c309fb1f71 Mon Sep 17 00:00:00 2001
From: Antti Villberg <antti.villberg@semantum.fi>
Date: Thu, 9 Jan 2020 13:59:08 +0200
Subject: [PATCH] MainProgram polls nanoTime too often

gitlab #440

Change-Id: I9d6b1514907682b990ae21588ced70b35f5ed6f5
---
 .../src/org/simantics/acorn/MainProgram.java                | 6 ++----
 .../src/org/simantics/acorn/OperationQueue.java             | 6 ++++--
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/bundles/org.simantics.acorn/src/org/simantics/acorn/MainProgram.java b/bundles/org.simantics.acorn/src/org/simantics/acorn/MainProgram.java
index ec4d56c21..1e4b5cbac 100644
--- a/bundles/org.simantics.acorn/src/org/simantics/acorn/MainProgram.java
+++ b/bundles/org.simantics.acorn/src/org/simantics/acorn/MainProgram.java
@@ -102,17 +102,15 @@ public class MainProgram implements Runnable, Closeable {
 
 				if(updates.isEmpty()) {
 
-					long start = System.nanoTime();
-
-					operationQueue.waitFor();
+					long duration = operationQueue.waitFor();
 
 					if (!alive)
 						break main;
 
-					long duration = System.nanoTime()-start;
 					if(duration > 4000000000L) {
 						checkIdle();
 					}
+					
 				}
 
 //				long sss = System.nanoTime();
diff --git a/bundles/org.simantics.acorn/src/org/simantics/acorn/OperationQueue.java b/bundles/org.simantics.acorn/src/org/simantics/acorn/OperationQueue.java
index 7a9d8aba2..a85aa8829 100644
--- a/bundles/org.simantics.acorn/src/org/simantics/acorn/OperationQueue.java
+++ b/bundles/org.simantics.acorn/src/org/simantics/acorn/OperationQueue.java
@@ -157,18 +157,20 @@ class OperationQueue {
 	 * Wake up when new operations are scheduled or the last operation is committed
 	 * Called by MainProgram thread
 	 */
-	synchronized void waitFor() {
+	synchronized long waitFor() {
 
 		mainProgram.assertMainProgramThread();
 
 		// One last check within the monitor 
-		if(!operations.isEmpty() || !tasks.isEmpty()) return;
+		if(!operations.isEmpty() || !tasks.isEmpty()) return 0;
 
+		long start = System.nanoTime();
 		try {
 			wait(5000);
 		} catch (InterruptedException e) {
 			LOGGER.error("Unexpected interruption", e);
 		}
+		return System.nanoTime() - start;
 
 	}
 
-- 
2.43.2