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On Wed, Feb 25, 2009 at 2:39 AM, Alex Davies <> wrote:
>> I did a quick, nonreliable test, and it took about 14 times longer  with a
>> C hook.  Also, another problem I thought of: what if the script  makes an IO
>> call?It'll still block...
> It is a problem - your whole C library needs to either have a guaranteed
> worse case time (even Lua's standard library doesn't offer this,
> string/io/table libraries can take a long time performing their various
> functions) or check the debug hooks themselves.

Yes, indeed.

("xyzzy"):rep(1e7):gsub("(z+)", "Z")

This one takes 4 seconds on my box, and has just 9 instructions.

While one can take away IO from untrusted code, string library is
usually a requirement...