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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...


On Feb 24, 2009, at 14:54, eugeny gladkih <> wrote:

"AG" == Alexander Gladysh <> writes:

Say, I set instruction count hook. If it is triggered (and some
condition is met -- given time passed, for example), I need to kill
Lua state. How do I kill it most gracefully? I'd like all allocated
resources to be freed. (I think it would be perfect to be able to
imitate conventional runtime error raised from the hook point. Not
sure if this is achievable though...)

I have an application that does this,
from inside the debug hook callback:

if (timeout) {
 lua_pushstring(L, "Script timeout.");

and it *seems* to work fine, but I'm no expert...

AG> I see this is a popular solution. Thank you everyone who answered my question!

AG> Can any Lua internals expert confirm that this is safe? Can
AG> instruction count debug hook get called in the middle of something
AG> sensitive?

another intresting question is how much will it affect the performance?

Yours sincerely, Eugeny.
Doctor Web, Ltd.