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based on an earlier version of the Wolfram Language.
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MathLink C Function

MLDestroyMark()

void MLDestroyMark(MLINK link, MLMARK mark)
destroys the specified mark on a link.
  • Calling MLDestroyMark() releases memory associated with the storage of expressions recorded after the mark.
  • MLDestroyMark() is declared in the MathLink header file mathlink.h.
#include "mathlink.h"

/* create a mark in a link, read some data, then back up */

void f(MLINK lp)
{
    MLMARK mark;

    mark = MLCreateMark(lp);
    if(mark (MLMARK)0)
        { /* mark creation failed */ }

    /* read data from the link */

    MLSeekToMark(lp, mark, 0);

    MLDestroyMark(lp, mark);
}