It would be interesting to see the /E output after doing that?

It's about a megabyte of output ... too big for my scratchpad, I think ??

If you need the CRT free(), what/where/how was the thing being freed, allocated?

Good question. I put: 
#ifdef malloc
printf("\nmalloc has been defined to something\n");
#endif

[download]
just prior to the malloc() call, and it confirmed that malloc had, indeed been defined to something.
Interestingly, I can #undef malloc prior to the malloc() call, and that has no effect on any aspect of the behaviour of the script (AFAICT).
I don't think I really want to delve into those convolutions you mentioned earlier ;-)

I suspect you may have been on the right lines in your other post

I've just checked that char*msg, char*arg and char*thread_arg (which is the arg that was originally malloc()'d) all point to the same location - and they do.
IIUC (not guaranteed), that means you can free the memory by calling free() on either one of the three.

Cheers,
Rob

In reply to Re^8: XS: free() outside of the main thread causes crash on Windows by syphilis
in thread XS: free() outside of the main thread causes crash on Windows by OlegG

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