CODEWITHSUNDEEP
c++processreal-timewin32-process
linello
linello

Reputation: 8704

How to be sure that the process is set to REAL_TIME priority

I'm developing a console C++ application with Visual Studio on Windows XP that must be at the highest priority possible for the scheduler.

 int main()
 {
     while ( somecondition )
     {
        // pick data from external hardware every 10 milliseconds
        // do computation 
     }

 }

I mean no other system process should interfere with it because it's a real time data acquisition system tuned to refresh the frame buffer every 10 milliseconds.

I tried to save to a file the temporal length of each frame and I found a strange "quantization" around my desidered time. Why?

I also found that sometimes the length is a multiple of my base frame time, is this caused by interfering internal O.S. processes?

Is there a way to ensure the highest priority of my program?

Upvotes: 0

Views: 2355

Answers (1)

rkosegi
rkosegi

Reputation: 14638

All you need is to call SetThreadPriority

I used like this:

HANDLE hThread = GetCurrentThread(void);
SetThreadPriority(hThread, THREAD_PRIORITY_TIME_CRITICAL);

Just to to note that other application can do same, so both threads will have same priority.

Upvotes: 2

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