Child states and garbage collection
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- Subject: Child states and garbage collection
- From: "Matthew Harmon" <matt@...>
- Date: 2004年9月12日 19:43:35 -0500
Hi all:
I experienced something strange while running scripts in "child" states from
a master state. Essentially, I was doing this to load a script and save
it's entry point:
luaL_loadfile(childState, fileName);
entryPointRef = luaL_ref(childState, LUA_REGISTRYINDEX);
However, this seems to have created a reference to childState such that it
was never completely garbage collected. I could see lua_getgccount()
constantly growing as I reloaded/ran the script. Then, I learned to do
this:
luaL_unref(childState, LUA_REGISTRYINDEX, entryPointRef);
Viola! The memory usage stops growing and GC seems to always work back to a
"steady state". Made sense to me. The script can now be GC'd because
nobody holds a reference to it.
EXCEPT... on occasion, the script seems to be GC'd before I do the unref()
and it crashes when I get to the unref(). Can anybody give me a hint about
this. Am I approaching this totally wrong?
I managed to solve the problem by creating my references in the "master"
state, but I'd still like to understand what is going on under the hood.
Many thanks,
Matt