Re: "Invalid free()" with C extension on OS X
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- Subject: Re: "Invalid free()" with C extension on OS X
- From: Josh Haberman <jhaberman@...>
- Date: 2011年2月15日 19:50:09 +0000 (UTC)
Peter Odding <peter <at> peterodding.com> writes:
> Anyway, to get to my point: I'm thinking my problem is related to
> allocating memory in one thread and then trying to deallocate the memory
> in another thread (either that or a race condition between the memory
> allocators of both threads). Might this be your problem as well?
Thanks a lot for the suggestion Peter. In my case I am not spawning any
threads. In fact I get the same crash if my Lua program does nothing but:
require "upb"
And I should have mentioned this in my original email, but I can reproduce
the crash even when my luaopen_upb is:
int luaopen_upb(lua_State *L) {
lua_createtable(L, 0, 0);
return 1; // Return package table.
}
However, the crash goes away if I change this to:
int luaopen_upb(lua_State *L) {
return 0;
}
This leads me to believe that it's got to be something about how I'm
building the extension. But what? My build/link line is:
gcc -std=c99 -Isrc -Itests -I. -Wall -Wextra -Wno-missing-field-initializers
-I/usr/include/lua5.1 -fpic -shared -o lang_ext/lua/upb.so lang_ext/lua/upb.c
src/libupb_pic.a -L/usr/local/lib -llua
Maybe I shouldn't be linking against Lua at this point -- since the lua
binary is already linked against it, maybe I'm loading Lua twice as Luiz
suggested. But if I don't link against Lua at this point I get undefined
reference errors (even though I'm compiling with -shared).
Josh