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POpointer being freed was not allocated error?
 

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  1. POpointer being freed was not allocated error?
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    <p>I have seen many posts for this error. But I'm not reserving memory dynamically or doing anything in destructor: This program is SSJF algorithm for selecting cylinder in operating system.</p> <p>I have a simple class called IO:</p> <pre><code>class IO { public: IO(); IO(int,int); void setIO(int,int); ~IO(); int trackNo; int arrival; int start; int end; bool finished; }; </code></pre> <p>Here is the implementation of the class::</p> <pre><code>IO::IO(int arr, int tNum) { this-&gt;arrival = arr; this-&gt;trackNo = tNum; this-&gt;start = 0; this-&gt;end = 0; } IO::IO() { } IO::~IO() { } void IO::setIO(int t1, int t2) { this-&gt;trackNo = t1; this-&gt;arrival = t2; } </code></pre> <p>And finally here is part of main program:</p> <pre><code>list&lt;IO&gt; myList; .... myList.push_back(tmpIO); //Add to the list ... list&lt;IO&gt; wt_list; </code></pre> <p>And later I'm trying to do some operations. I have deleted some of the part which is not related.</p> <pre><code> //list&lt;IO&gt;::iterator itMin; while(myList.size()&gt;0) { //If it is the first input just get it if(f) { IO selected = myList.front(); curr_time += selected.arrival + selected.trackNo; f=false; cout &lt;&lt; selected.arrival&lt;&lt;endl; lastPos = selected.trackNo; myList.pop_front(); } //Check if there is any item to add to queue while(myList.front().arrival &lt; curr_time) { wt_list.push_back(myList.front()); myList.pop_front(); //Error is coming from this line } while(wt_list.size()&gt;0) { } </code></pre> <p>Error message:</p> <p>malloc: <strong>* error for object 0x10f68b3e0: pointer being freed was not allocated *</strong> set a breakpoint in malloc_error_break to debug</p> <p>Anyone can help me and explain why I get this error and how can I skip it?</p>
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      1. PTAnswer
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    1. USBernard
    1. USBernard
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      1. VTDownMod
    1. COso, where do you get the error? have you tried running your program in a debugger?
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      1. UScodeling
    2. COPlease post the exact error message, and (if possible), add comments to your code sample to show which line(s) the error refers to.
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      1. USJBentley
    3. COI have added more information. Error is coming from third part where I have commented.
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      1. USBernard
 

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