question about the active object

[liuxingyu_best]

Thanks a lot.

[skumar_rao]

yes it can run concurrently

[liuxingyu_best]

Thanks a lot.

[amitkankani]

first of all why do you want to have 2 threads, u can easily do with 2 active objects in the same thread. This will make your life simpler !!!

However, if you still want to have 2 threads, then you might have to use some thread communication mechanism.
It could be through client-server, or message passing, or shared heap, or simply active objects synchronized way, where in the heap is shared and hence by basic active objects you can pass messages.

[cheney23]

Thank you for your reply,

now the problem is cocurrency, I want to use the active object to read some data from file, and then I want to display these data in the main thread. Due to the cocurrency, the code used for displaying data in the main thread is alway executed before end of the execution of the active object. Therefore, every time I can't extract the right data from the active object.

How can I solve it?

Thank you

may be u'd better create a flag, u should set it to ETrue then the thread read data from file completely, on the other hand the main thread should display the data after check the flag.

[liuxingyu_best]

Thanks a lot.

[wizard_hu_]

I define a active object. can the active object be executed as another thread against the main thread?

No, it can not. There are not any extra threads in your code until you explicitly start using RThread.
Active objects are basically callbacks invoked by the Active Scheduler running in your "main thread". This inherently means that there is no 'concurrency' between active objects, one runs after the other. That is why RunL methods have to return fast, and it also applies to methods from M-classes and TCallBack.

[amitkankani]

I am little confused, are you creating a separate thread yourself in the code, something like

RThread thread;
thread.Create(....);
thread.Resume(...);

well if not then it is a single thread you are working on.
In case of single thread, you can do this, once the active object has read the data, then you can call DrawNow or DrawDeferred of the particular container being shown.

[amitkankani]

i.e. in the RunL of the active object, you can call draw of the current container, or change view, etc, depending on your application logic. !

[wizard_hu_]

I want to use the active object to read some data from file, and then I want to display these data in the main thread. Due to the cocurrency, the code used for displaying data in the main thread is alway executed before end of the execution of the active object. Therefore, every time I can't extract the right data from the active object.

RunL method of your AO is the perfect place for doing that 'extraction'. You can freely launch a note/any other popup from that RunL, or do anything else.

[liuxingyu_best]

Thanks a lot.

[liuxingyu_best]

Thanks a lot.

[wizard_hu_]

Why do not you use [CODE ] and [/CODE ] tags (without the spaces)? It preserves your formatting for example.

Anyway, note that OnContentL may be invoked multiple times, and in that cases you simply overwrite old content. This kind of code can be debugged in the emulator, so you can try that.

[amitkankani]

Yes rightly said, you should use [CODE ] tags when posting code so that we can read it easily.

Also OnContentL , you should be appending to old values and not simply assigning.

Also AppendItemsL is called when. Make sure you call it once the parsing is DONE...

Use breakpoints to check the same.

[KKrishna]

Hi,

Can you please elaborate more on the situation.