Well, this pattern ought to work as long as you don't call anything L-related in your Cleanup(). You are likely to leak memory though, but it shouldn't crash. Generally though, C++ exceptions and non-local C jumps that Lua uses for coroutine management don't play well together.
-----Original Message-----
From: lua-bounces@bazar2.conectiva.com.br [mailto:lua-bounces@bazar2.conectiva.com.br] On Behalf Of Aidin Abedi
Sent: Thursday, October 02, 2008 2:05 PM
To: Lua list
Subject: Re: I need your help! C++ exception in coroutine Crashes.
Thank you for your replies.
I have a panic handler but its not called since I only use lua_pcall.
I use exception-handling outside and it seems like coroutine.resume disables it.
The code at its grittiest:
----------------------------------------
C++:
int main() {
try {
lua_pcall(L, ...);
} catch (...) {
Cleanup();
exit(0);
}
return 0;
}
int ThrowCppException(lua_State *L) {
throw "I'm a exception";
return 0;
}
----------------------------------------
Lua:
print "main"
ThrowCppException() -- app catches exception and exits gracefully
function foo()
print "coroutine"
ThrowCppException() -- app crashes without catching exception
end
co = coroutine.create(foo)
coroutine.resume(co)
----------------------------------------
On Thu, Oct 2, 2008 at 9:57 PM, Bilyk, Alex <ABilyk@maxis.com> wrote:
Do you handle the exception in the same function or someplace outside?
-----Original Message-----
From: lua-bounces@bazar2.conectiva.com.br [mailto:lua-bounces@bazar2.conectiva.com.br] On Behalf Of Patrick Donnelly
Sent: Thursday, October 02, 2008 11:49 AM
To: Lua list
Subject: Re: I need your help! C++ exception in coroutine Crashes.
On Thu, Oct 2, 2008 at 6:37 AM, Aidin Abedi <aidinabedi@gmail.com> wrote:
Hello
I've embedded lua and when I call a c++ function (that throws a c++
exception) inside a coroutine my app crashes badly. Windows just says:
"Runtime Error!
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information."
I do have a c++ exception-catch outside the pcall. There is no crash
if I call the same function (that throws a exception) from inside
lua's main-thread.
This issue must have been detected before. Please help me!
I appreciate any ideas. I thank you for your time.
It sounds to me like you did a generic lua_call in the main thread
(instead of lua_resume). When Lua catches the error, and no error
handler was set for that thread, it will exit the main application.
You should implement a panic handler to check if this is the case.
Cheers,
--
-Patrick Donnelly
"One of the lessons of history is that nothing is often a good thing
to do and always a clever thing to say."
-Will Durant
