Comments by yuzaihuan

yuzaihuan 14-Jul-15 20:24pm View

Hi, Karstenk, thanks for your attention.

I am not quite understand what your said. Could you show more detail?

In this project, I had two seperate cameras (two seperate threads/files, same as file1.c); image grabbing finished by two similar & seperate threads (in file2.c); of course, in file3.c, I provided two seperate call-backs, two seperate image buffers, two flags (mbSnapOk[0],mbSnapOk[1]).

yuzaihuan 15-Sep-14 3:15am View

Thank u, KarstenK.
I have tested the code, it is OK.
Need add #include <windows.h> first.

yuzaihuan 4-Sep-14 21:42pm View

POSIX is from Unix, but environment is Windows.

yuzaihuan 4-Sep-14 21:35pm View

got it, I think I need add windows API to use "CreateMutex()" in my code.

yuzaihuan 3-Sep-14 20:47pm View

It is OK in C++, or C#, but can I transform this code into C, if yes how to do ?

Thank you.

yuzaihuan 5-Mar-14 20:59pm View

Very good, thank you.

yuzaihuan 5-Mar-14 5:03am View

Thank you very much. SA.

yuzaihuan 3-Mar-14 22:59pm View

Oh, using WaitAll() the compiler will show error: "WaitAll for multiple handles on STAThread is not supported", but the 3rd party Active controls I used in my code only supported in STAThread.

I have found a link: http://www.codeproject.com/KB/recipes/WaitHandleExceptions.aspx?display=Print, it may help me.

I don't know when a thread in a wait state, it will not cost any CPU.

Thank you. SA.

yuzaihuan 3-Mar-14 5:18am View

Not know how to wait all the signals in an effective way.

yuzaihuan 3-Mar-14 5:03am View

SA, thank you very much.

Can you help to improve my thread coding as above shown?

Before this, I will provide more info about my question:
My project is related with image processing. and I used 2 cameras, with 8 images grabbed by each camera. To decrease the whole processing time, I want to process each image once it was grabbed. In other words, I need process 16 images in total.
After processed, I need combine 2 cameras result (2 outputs, pass or fail) together, as "11", or "10", "00", "01" to other IO device.
Above code is for send result out.

1)I am not sure how to improve my send result out thread, as it need wait all the signals?
2)Previously I want to use Waithandle.WaitAll(signalArray,100,false), but the compiler shows error, as WaitAll only used in MTAThread. So I changed the Main() attribute from [STAThread] to [MTAThread] (my coding environment is VS C# 2005). But as I have used some 3rd part ActiveX control, which can't be used under [MTAThread], and I had to give up WaitAll();
3)I had some trial with WaitAll in console/WinForm application, it runs smoothly in normal state, but when I want to exit the code, seems it has less response to user input. Now I add a "Exit" button on the form, when it was clicked, it will call:
<pre lang="c#"> Interlock.Exchange(icKillAllThreads,1);</pre>
so you can see I did a check for icKillAllThreads value in above code.
Seems I know little about the 3rd parameters meaning for
<pre lang="c#">public static bool WaitAll(
WaitHandle[] waitHandles,
int millisecondsTimeout,
bool exitContext
)</pre>
, can you show me more about this?

Thank you again.

yuzaihuan 2-Mar-14 21:06pm View

Sorry, not quite understood the MSDN documents.

In simple, I need wait all the signals, but can't use WaitAll(), how to do?

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