"Sampo's Delight" - add "do not show this window again" to memory warning; check physical RAM on linux and only warn if limit is less than 75% of total RAM; do nothing on OSX since there is no mlockall there

git-svn-id: svn://localhost/ardour2/trunk@1534 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/ardour_ui.cc

@@ -437,27 +437,71 @@ ARDOUR_UI::save_ardour_state ()
 void
 ARDOUR_UI::startup ()
 {
-	if (engine->is_realtime()) {
+	check_memory_locking();
+}
+
+void
+ARDOUR_UI::no_memory_warning ()
+{
+	XMLNode node (X_("no-memory-warning"));
+	Config->add_instant_xml (node, get_user_ardour_path());
+}
+
+void
+ARDOUR_UI::check_memory_locking ()
+{
+#ifdef __APPLE__
+	/* OS X doesn't support mlockall(2), and so testing for memory locking capability there is pointless */
+	return;
+#endif
+
+	XMLNode* memory_warning_node = Config->instant_xml (X_("no-memory-warning"), get_user_ardour_path());
+
+	if (engine->is_realtime() && memory_warning_node == 0) {
 
 		struct rlimit limits;
+		int64_t ram;
+		long pages, page_size;
+
+		if ((page_size = sysconf (_SC_PAGESIZE)) < 0 ||(pages = sysconf (_SC_PHYS_PAGES)) < 0) {
+			ram = 0;
+		} else {
+			ram = (int64_t) pages * (int64_t) page_size;
+		}
 
 		if (getrlimit (RLIMIT_MEMLOCK, &limits)) {
 			return;
 		}
 		
 		if (limits.rlim_cur != RLIM_INFINITY) {
+
+			if (ram == 0 || ((double) limits.rlim_cur / ram) < 0.75) {
+			
+
 				MessageDialog msg (_("WARNING: Your system has a limit for maximum amount of locked memory. "
 						     "This might cause Ardour to run out of memory before your system "
 						     "runs out of memory. \n\n"
 						     "You can view the memory limit with 'ulimit -l', "
 						     "and it is normally controlled by /etc/security/limits.conf"));
 				
+				VBox* vbox = msg.get_vbox();
+				HBox hbox;
+				CheckButton cb (_("Do not show this window again"));
+				
+				cb.signal_toggled().connect (mem_fun (*this, &ARDOUR_UI::no_memory_warning));
+				
+				hbox.pack_start (cb, true, false);
+				vbox->pack_start (hbox);
+				hbox.show_all ();
+				
 				editor->ensure_float (msg);
 				msg.run ();
 			}
 		}
+	}
 }
 
+
 void
 ARDOUR_UI::finish()
 {

gtk2_ardour/ardour_ui.h

@@ -697,6 +697,9 @@ class ARDOUR_UI : public Gtkmm2ext::UI
 
 	bool can_save_keybindings;
 	bool first_idle ();
+
+	void no_memory_warning ();
+	void check_memory_locking ();
 };
 
 #endif /* __ardour_gui_h__ */