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POHow can a small change in a code which is never executed make a difference?
 

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  1. POHow can a small change in a code which is never executed make a difference?
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    <p>I have a <strong>very strange</strong> problem and since it is not possible for me to send code I will try to explain.</p> <p>This is more like philosophical problem - I hope someone has time/knowledge to think about this.</p> <p>1) I have project.cpp looking exactly like this:</p> <pre><code>#include &lt;pthread.h&gt; #include &lt;unistd.h&gt; pthread_t pplayer_thread; void *play(void*); int main(int argc, char **argv) { pthread_create(&amp;pplayer_thread, NULL, play_cb, NULL); usleep(5000000); return 0; } </code></pre> <p>2) pplayer.cpp looking something like this:</p> <pre><code>... void *play_cb(void *arg) { // this starts movie using gstreamer and exits thread } ... </code></pre> <p>3) <strong>not_executed</strong>_from_main.cpp looking something like this:</p> <pre><code>... extern MyClass *myObj; // this is included from .h file ... MyClass *myObj = NULL; ... some_function() { ... myObj = MyClass::createNew(args); ... } ... </code></pre> <p>This is all linked together with various other libraries and ton of garbage, but this is basically what is important.</p> <p>--> <strong>Problem</strong>:</p> <p>When I run this, I should see window playing movie clip using gstreamer for 5 seconds -> <strong>BUT I only hear sound!</strong></p> <p>--> <strong>Strange thing</strong>:</p> <p>When I comment the line:</p> <pre><code>myObj = MyClass::createNew(args); </code></pre> <p>and run again --> I see gstreamer window also (everything is fine)</p> <p>--> <strong>Notes</strong>:</p> <p>this may have something to do with:</p> <ul> <li><strong>linking process</strong> and <strong>nature of MyClass and it's parent class</strong> (my best guess)</li> <li>"static" keyword</li> <li>"external" keyword</li> <li>C and C++ mixing</li> </ul> <p>--> <strong>I ask once more</strong>:</p> <p><strong>How can a small change in a code which is never executed make a difference?</strong></p> <p>(please help)</p>
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      1. POHow can a small change in a code which is never executed make a difference?
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      1. POHow can a small change in a code which is never executed make a difference?
      1. USAbhijeet Rastogi
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      1. POHow can a small change in a code which is never executed make a difference?
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    1. COProbable memory issues, check with valgrind
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      1. POHow can a small change in a code which is never executed make a difference?
      1. USacademicRobot
    2. COTry running the program under valgrind and see if there are any stackoverflows/memory leaks/double frees/<insert nasty stuff>.
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      1. POHow can a small change in a code which is never executed make a difference?
      1. USorlp
    3. COThere should be no difference. But it seems your `not_executed_from_main.cpp` is making a difference which you are not aware. Could show us the more of this .cpp and .h file?
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      1. POHow can a small change in a code which is never executed make a difference?
      1. USShiplu Mokaddim
 

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