Comments by tschoni - CodeProject

tschoni 2-Jun-11 20:17pm View

i think i do, no?
other stuff is happening next do this.
and every so-and-so many seconds i update the gps signal that is used by other parts of the software

oh, and the signal frequency is basically given by the gps
maybe that's why threading makes sense. thread just sits and waits until new signal arrives, interprets it and saves it to a variable accessible by other parts of the software

tschoni 1-Jun-11 4:47am View

it's as always very clear if someone explains it properly :)
thanks a lot for all your help!!!
all questions answered, everyone happy! (everyone being me)

tschoni 1-Jun-11 3:22am View

thanks for the elaborate reply, please note that I posted a 'answer' which is actually a reply to your comment ... just to make code more readable

tschoni 31-May-11 23:55pm View

Regarding 2:

At first it was unclear to me what the difference between mutex'es and critical sections are.
A good discussion on the topic can be found here:
http://www.codeguru.com/forum/showthread.php?t=333192
Summarized: Use critical sections if resources are shared only within one process.

On how to use the critical secions: the simplest syntax (or the one that suits me most) I found in this example here - very straightforward
http://msdn.microsoft.com/en-us/library/ms686908%28v=vs.85%29.aspx

tschoni 31-May-11 22:25pm View

Regarding 1:

The link provided explains the solution well. One thing that is discussed is too is because
Thread->m_bAutoDelete = FALSE;
is used the Thread handle needs to be deleted manually.
The way I use this in a class I thought the best way to do it is using new directive when creating the thread handle in the constructor and use delete directive in the deconstructor.
This however still results in a memory leak caused by the not properly deleted thread handle, why is this?

Why is it not recommended to use Sleep();? And how to easiest create a safe dummy handle?

tschoni 31-May-11 8:48am View

Deleted

thanks for taking the time to look at my code and for the good answers.

i will try to implement tomorrow and post anything I stumble accross here, in case anybody else will try to do something similar in the future.

tschoni 31-May-11 2:14am View

NOTE: the title of this thread is misleading by now, I started another thread under
http://www.codeproject.com/Questions/204050/Thread-communication-thread-safety-example-problem.aspx

to any moderator, I think this thread should be deleted, content & title dont really match anymore and example problem is misleading

many thanks for your help

tschoni 31-May-11 1:42am View

thanks for the suggestions
however, i feel the "easy" way to do is is still using a working thread, I dont see why a UI thread should be used, can you maybe explain?
because the "main" purpose is not really sending messages back and forth but just "publishing" received data in a fixed time interval.
the only message it has to somehow receive is when to terminate (which will be only when starting & shutting down pc)

tschoni 26-May-11 0:07am View

Of course the INFINITE timeout is just here because this is meant as an example.

About the better ways to solve this:
The idea is to write a class which handles reading GPS data from a serial bus.
The whole idea behind encapsulating this in a class was thread safety to begin with.
One thread as part of the class should be reading data.
The data should only be accessible through a class member function, which implicitly ensures thread safety without the caller having to worry about it.

I see that the "friend" solution is kind of drifting apart from this.

Maybe I should use a static member function, that receives a "this" pointer as argument, instead of a friend function.

Maybe you suggest something else?

tschoni 20-May-11 23:32pm View

thanks for the good suggestion
this looks exactly like what i need, will test it this afternoon and post whether it did what i wanted :)

tschoni 20-May-11 5:16am View

thanks for the tipp, might be safer, but by itself it didn't solve the problem

tschoni 18-May-11 4:08am View

good to know, in the example code I actually wondered what the m_ convention means. thanks a lot.

tschoni 18-May-11 3:41am View

perfect answer, thanks a million times

Comments by tschoni (Top 13 by date)