the old "#undef free" trick

I was reluctant to mention that as I am unfamiliar with the effects in a mingw environment.

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

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

I'm guessing that it gives your the CRT free(), but that then brings up the question:

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

I suspect you may have been on the right lines in your other post; and the problem is that actually, the OP is freeing the wrong thing. And the fact that by doing so using the CRT free() doesn't cause a crash is simply luck.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^7: XS: free() outside of the main thread causes crash on Windows by BrowserUk
in thread XS: free() outside of the main thread causes crash on Windows by OlegG

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