100 cpu

This is a discussion on 100 cpu within the Windows Programming forums, part of the Platform Specific Boards category; i've noticed that using peekmessage is just like using while(1) and totaly consumes the cpu, what's the best delay to ...

  1. #1
    Mmm. Purple.
    Join Date
    May 2002
    Posts
    154

    100 cpu

    i've noticed that using peekmessage is just like using while(1) and totaly consumes the cpu, what's the best delay to put into the loop?
    I was thinking sleep(0); what do you guys think?

  2. #2
    Yes, my avatar is stolen anonytmouse's Avatar
    Join Date
    Dec 2002
    Posts
    2,544
    The standard non-busy message loop is:
    Code:
        BOOL bRet;
        MSG msg;
    
        while( (bRet = GetMessage( &msg, NULL, 0, 0 )) != 0)
        { 
            if (bRet == -1)
            {
                // handle the error and possibly exit
            }
            else
            {
                TranslateMessage(&msg); 
                DispatchMessage(&msg); 
            }
        }
    If you want a delay in a PeekMessage() loop, yes you can use Sleep(1)(not Sleep(0)*) to give up the rest of the thread time slice when you have done whatever you need to do.

    *Apparently, Sleep(0) will only yield to threads with the same or higher priorites, while Sleep(1) or above will yield to any thread.

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