#2829 Add overall handling of std::bad_alloc exception with a message box. Now the user can know what is happening, and possibly save his work. On linux this will only work sometimes unless sysctl vm.overcommit_memory = 2

ApplicationCode/Application/RiaApplication.cpp

@@ -134,6 +134,40 @@ void AppEnum< RiaApplication::RINavigationPolicy >::setUp()
 //==================================================================================================
 
  
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+bool RiaApplication::notify(QObject* receiver, QEvent* event)
+{
+    // Pre-allocating a memory exhaustion message 
+    // Doing som e trickery to avoid deadlock, as creating a messagebox actually triggers a call to this notify method.
+
+    static QMessageBox* memoryExhaustedBox = nullptr;
+    static bool allocatingMessageBox = false;
+    if (!memoryExhaustedBox && !allocatingMessageBox)
+    {
+        allocatingMessageBox = true;
+        memoryExhaustedBox = new QMessageBox(QMessageBox::Critical, 
+                                             "ResInsight Exhausted Memory", 
+                                             "Memory is Exhausted!\n ResInsight could not allocate the memory needed, and is now unstable and will probably crash soon.");
+    }
+
+    bool done = true;
+    try
+    {
+        done = QApplication::notify(receiver, event);
+    }
+    catch ( const std::bad_alloc& )
+    {
+        if (memoryExhaustedBox) memoryExhaustedBox->exec();
+        std::cout << "ResInsight: Memory is Exhausted!\n ResInsight could not allocate the memory needed, and is now unstable and will probably crash soon."  << std::endl;
+        // If we really want to crash instead of limping forward: 
+        // throw;
+    }
+
+    return done;
+}
+
 //--------------------------------------------------------------------------------------------------
 /// 
 //--------------------------------------------------------------------------------------------------

ApplicationCode/Application/RiaApplication.h

@@ -216,6 +216,8 @@ private:
     friend RiaArgumentParser;
     void                    setHelpText(const QString& helpText);
 
+    virtual bool            notify(QObject *, QEvent *) override;
+
 private slots:
     void                    slotWorkerProcessFinished(int exitCode, QProcess::ExitStatus exitStatus);
 

ApplicationCode/Application/RiaMain.cpp

@@ -49,7 +49,22 @@ int main(int argc, char *argv[])
         RiaLogging::setLoggerInstance(new RiuMessagePanelLogger(window.messagePanel()));
         RiaLogging::loggerInstance()->setLevel(RI_LL_DEBUG);
 
-        int exitCode = app.exec();
+        int exitCode = 0;
+        try
+        {
+            exitCode = app.exec();
+        }
+        catch (std::exception& exep )
+        {
+            std::cout << "A standard c++ exception that terminated ResInsight caught in RiaMain.cpp: " << exep.what() << std::endl;
+            throw;
+        }
+        catch(...)
+        {
+            std::cout << "An unknown exception that terminated ResInsight caught in RiaMain.cpp.  " << std::endl;
+            throw;
+        }
+
         RiaLogging::deleteLoggerInstance();
 
         return exitCode;