Changes between Initial Version and Version 1 of KernelTask

Timestamp:

09/27/07 20:45:46 (17 years ago)

Author:

art

Comment:

--

KernelTask

@@ +1 @@
+= Manual =
+
+== How to use Kernel/Task subsystem ==
+
+Most of the games has got a main-loop. During the execution of one cycle of the loop a game engine has to perfrom a lot of tasks, e.g. checking user input, rendering, physic update and so on. [[BR]] 
+nrEngine's Kernel/Task subsystems provides a simple but powerfull interface to manage the main loop. The engine does contains a '''Kernel''' which runs in the background of the engine. A '''Task''' can be bound to the kernel, so that it gets updated every cycle. A task can be any user derived class which has to perform repetitive jobs, e.g. check for user input or stream data from the disk. [[BR]]
+Moreover a task can get a specific order number or it can depend on another task. Hence the engine does provide a simple graph based task execution system. The functionality of the nrEngine's kernel is similar to the operating system's one, but in a very simple form. [[BR]]
+And finally a task can be shifted to a thread, so that it executes in parallel to the main application.
+
+The following code show you how to use the engine's kernel subsystem for a simple managment of tasks in your application/game:
+{{{
+#include <nrEngine/nrEngine.h>
+
+using namespace nrEngine;
+
+//! This is a simpel task performing sound output
+class SoundTask :  public ITask
+{       
+public: 
+  
+        SoundTask();
+        ~SoundTask();
+
+        //! This method will be called when the task stops                              
+        Result stopTask();      
+        
+        //! Task was added to the kernel, so initilize it
+        Result onAddTask();
+        
+        //! This is called every cycle, so that SoundTask can react on it
+        Result updateTask();
+
+        ...
+};
+
+void main()
+{
+        // Initialize engine
+        ...
+
+
+        // Add the sound task to the kernel with a low order number
+        Engine::sKernel()->AddTask(new SoundTask(), ORDER_LOW);
+
+        // Executes engine's kernel, hence execute all tasks which are in the kernel
+        // The function returns if there are no more tasks in the kernel (i.e. if all tasks stops)
+        Engine::sKernel()->Execute();
+}
+}}}  
+
+See also: ["ManualPage"]