The problem is that those also get redefined at various points

Aaaah ... it seems to be the old "#undef free" trick that's needed here.
The following rendition works fine for me on Strawberry: 
void *thread(void *arg) {
#undef free
    char *msg = (char*)arg;
    printf("thread: %s\n", msg);
    free(msg);
    return NULL;
}

[download]
You can probably disregard my other post of a few minutes ago.

(By undeffing free, we get to call the free() that we want, not the the free() that perl defined for us.)

Cheers,
Rob

In reply to Re^6: 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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