Deleting and re-allocating global pointer - segfault

Question

I have in test.h file: double *condmatrix - global variable Then in the main program I do:

cycle_start {
    proc1() {
    condmatrix = new double[maxdim];
    ....simple work with the array itself
    }
    proc2() {
    delete [] condmatrix;
    }
}//cycle finish

This gives me a segfault. I tried deleted with [] syntax, without and other ways, it still gives a segfault. Maxdim varies from cycle to cycle.

Looks all right. Can you give us a minimal complete example? — Beta, Apr 11 '13 at 13:56
Which is the value of maxdim? see [link] (http://stackoverflow.com/questions/1087042/c-new-int0-will-it-allocate-memory) — Tio Pepe, Apr 11 '13 at 14:07
no, maxdim isn't equal to zero. within the cycle all I do is fill it with random numbers and then normalize every element (so that sum equals 1) — lhj7362, Apr 11 '13 at 14:10
you are probably corrupting memory somewhere. check if you are crossing boundries. — Gorkem, Apr 11 '13 at 14:23

score 0 · Answer 1 · answered Apr 11 '13 at 14:52

Okay, I found that I allocated a pointer twice, that is:

condmatrix = new double [maxdim];
condmatrix = new double [maxdim];
delete [] condmatrix;

I know this shouldn't cause the problem, but evidently it did, because after rewriting the code to allocate once, it works perfect. Maybe there was some memory corruption, which I occasionally fixed.

Deleting and re-allocating global pointer - segfault

1 Answers1