event handling is serialized in MS Visual Studio C++ 2005 ??

This is a discussion on event handling is serialized in MS Visual Studio C++ 2005 ?? within the Windows Programming forums, part of the Platform Specific Boards category; In Microsoft Visual Studio C++ 2005 let's suppose I have three events raised one just after the other (before the ...

  1. #1
    Alessio Stella
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    event handling is serialized in MS Visual Studio C++ 2005 ??

    In Microsoft Visual Studio C++ 2005 let's suppose I have three events raised one just after the other (before the first event has finished being handled) for instance:
    (1) button 1 click
    (2) 100msec Windows Form Timer elapsed
    (3) button 2 click

    What will happen?
    (1) Button 1 click handling is executed. Timer1 handling is executed. Button2 is eexcuted
    or
    (2) button 1 handling is interrupted by Timer1 handling?

    Another similar question:
    What if Timer1 elapses every 100 msec but its handler takes around 110 msec to be executed?
    (1) the queue of event handling raises up and at a certain point I have a system error?
    (2) the queue of event handling raises up and at a certain point I have discarding of events?
    (3) each handling interrupts the execution of previous not finished handling?

    Thank you

  2. #2
    Kernel hacker
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    The message handling is sequential. The timer itself will issue the message when the timer fires, but the message (event) handling will, unless you specifically work around it, handle the events one at a time, in the order they came in. And if you have a repeating timer, then you may find that you have more than one timer message in the message (event) queue.

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    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
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  3. #3
    CSharpener vart's Avatar
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    Quote Originally Posted by matsp View Post
    The message handling is sequential. The timer itself will issue the message when the timer fires, but the message (event) handling will, unless you specifically work around it, handle the events one at a time, in the order they came in. And if you have a repeating timer, then you may find that you have more than one timer message in the message (event) queue.

    --
    Mats
    In addition - WM_TIMER event has a lowest priority, so other events could be inserted into the event queue before the timer event was processed delaying the TIMER processing (that was already scheduled, but not dispached yet)
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

  4. #4
    Alessio Stella
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    Quote Originally Posted by vart View Post
    In addition - WM_TIMER event has a lowest priority, so other events could be inserted into the event queue before the timer event was processed delaying the TIMER processing (that was already scheduled, but not dispached yet)

    Thank you
    Could you suggest a link, an help page or something else where I can study in detail this subject?

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