# HG changeset patch
# User Jacob Dawid <jacob.dawid@googlemail.com>
# Date 1303024924 -7200
# Node ID 16d26344c2a29d77bf4b19d0237e2f727fb56f41
# Parent  aa1d4754edc34417e3efe191c1d8e9e3063cf17a
Added semaphore to ensure that the workspace view will not get updated twice at a time.

diff --git a/gui//src/VariablesDockWidget.cpp b/gui//src/VariablesDockWidget.cpp
--- a/gui//src/VariablesDockWidget.cpp
+++ b/gui//src/VariablesDockWidget.cpp
@@ -8,6 +8,7 @@
 }
 
 void VariablesDockWidget::construct() {
+    m_updateSemaphore = new QSemaphore(1);
     QStringList headerLabels;
     headerLabels << "Name" << "Type" << "Value";
     m_variablesTreeWidget = new QTreeWidget(this);
@@ -51,7 +52,7 @@
 }
 
 void VariablesDockWidget::setVariablesList(QList<SymbolRecord> symbolTable) {
-
+    m_updateSemaphore->acquire();
     // Split the symbol table into its different scopes.
     QList<SymbolRecord> localSymbolTable;
     QList<SymbolRecord> globalSymbolTable;
@@ -82,6 +83,7 @@
     updateScope(1, globalSymbolTable);
     updateScope(2, persistentSymbolTable);
     updateScope(3, hiddenSymbolTable);
+    m_updateSemaphore->release();
 }
 
 void VariablesDockWidget::updateScope(int topLevelItemIndex, QList<SymbolRecord> symbolTable) {
diff --git a/gui//src/VariablesDockWidget.h b/gui//src/VariablesDockWidget.h
--- a/gui//src/VariablesDockWidget.h
+++ b/gui//src/VariablesDockWidget.h
@@ -3,6 +3,7 @@
 
 #include <QDockWidget>
 #include <QTreeWidget>
+#include <QSemaphore>
 #include "OctaveLink.h"
 
 class VariablesDockWidget : public QDockWidget
@@ -16,6 +17,7 @@
     void updateTreeEntry(QTreeWidgetItem *treeItem, SymbolRecord symbolRecord);
     void updateScope(int topLevelItemIndex, QList<SymbolRecord> symbolTable);
     QTreeWidget *m_variablesTreeWidget;
+    QSemaphore *m_updateSemaphore;
 };
 
 #endif // VARIABLESDOCKWIDGET_H