I am writing a program that processes video input and after it runs for a while it sometimes exits with "pointer being freed was not allocated". However at no point in my program do I call free or malloc. I am passing objects of a class I defined around in vectors and the program uses pthreads to separate the input from the processing. Other than calling free twice on the same pointer without reallocating it in between what else could be causing this problem?
Unfortunately since it takes so long for the error to happen and because of the multithreading I don't know where this error is occurring so I can't include a sample of my code.
You may want to look into using safe pointers provided in C++11. They do many good things, but for you the best use would be to take care of memory deallocation for you.
This is the library that you will need to use.
From the little information that you have shared makes me believe that Shared Pointer is what you are looking for (but do look at other classes as well, Weak Shared Pointer and Unique Pointer might be needed in some parts of your application).
If you have any other questions, please ask a specific question.