Did you try on a threaded linux build?

Good point that I hadn't thought of. I was thinking that the difference was one of Linux versus Win32, but I gather you're suggesting it's one of threaded vs unthreaded. My linux builds are unthreaded and my Win32 builds are threaded, so you could be (and most likely are) right.

As it turns out, I *do* have an unthreaded build of perl-5.10.0 on Win32 and, indeed, there's no problem with calling free(string) on that particular build. So it looks like it's an issue on threaded builds of perl *only*.

Sounds like this bypasses a redefinition of free by Inline::C

Not sure what I'm s'posed to deduce from that. The issue I was describing is a general XS issue and not something limited to Inline::C (but you probably knew that). And there's usually no problem with free() in XS/Inline::C if the memory is allocated with malloc(). For instance, there's no problem with the following (in either threaded or unthreaded perl): 
use warnings;
use Inline C => <<'EOC';

#include <malloc.h>

void foo() {
     char * string;
     string = malloc(10 * sizeof(char));
     free(string);
}

EOC

foo();
print "All done without error\n";

[download]
The problem seems only to arise when it's the external library that allocates the memory.

Cheers,
Rob

In reply to Re^2: [Win32] "Free to wrong pool ..." error by syphilis
in thread [Win32] "Free to wrong pool ..." error by syphilis

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