I'm not sure if this is the real problem but aren't you mixing C++ allocation via new with C-deallocation via free and should instead also use the C++ delete operator to free the memory, i.e. define a function such as

void deleteForMe(int* pointer)
{
     delete[] pointer;
}

and call that instead of a simple free?

Regs,

Stephan

2013/9/25 Rujia Liu <rujia.liu@gmail.com>

Dear all,

I have trouble using foreign-free on win7 64bit.

My code:

C++:

int* gen(int n) {
    int* x = new int[n];
    for(int i = 0; i < n; i++) x[i] = i;
    return x;
}

LISP:

(defun gen-values (n)
    (let* ((ret (cffi:foreign-funcall "gen" :int n :pointer)))
            (dotimes (i n)
                (format t "~A~%" (mem-ref (mem-aptr ret :int i) :int)))
            (foreign-free ret)))

It works well on windows XP (32bit), but crashes on (foreign-free ret). SBCL win32 just crashes the process, while CCL win32 dropped me into kernel debugger. The topmost frame is a call to FREE.

Our customers use both 32-bit and 64-bit systems, so I'd like to provide a single exe that runs on both 32-bit and 64-bits. Our dev machine is running a 32-bit Windows XP, uses VS2008 to compile to C++ library to DLL.

After I commented out (foreign-free), the exe runs perfectly on both 32-bit and 64-bit, but there are memory leaks. Am I doing anything wrong?

Thanks in advance.

- Rujia