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Customize Lua GC, add object-memory-lock API.

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Add custom API to prevent Lua Objects from being garbage collected.
This is intended to for Ardour LuaBridge bindings (~1MB Objects:
tables, functions and userdata).
The bindings are persistent and the gc can skip them in mark & sweep
phases. This is a significant performance improvement for garbage
collection.

Note. The next version of Lua (5.4) will come with a generational-gc
rather than an incremental, so extending the API at this point in time
is acceptable.
This commit is contained in:
Robin Gareus 2018-03-19 01:33:13 +01:00
parent 130211a4bd
commit 78cf0e5235
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GPG key ID: A090BCE02CF57F04
4 changed files with 16 additions and 3 deletions
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libs/lua/lua-5.3.5/lstate.h
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@ -162,6 +162,7 @@ typedef struct global_State {
unsigned int gcfinnum; /* number of finalizers to call in each GC step */
int gcpause; /* size of pause between successive GCs */
int gcstepmul; /* GC 'granularity' */
int gcmlock; /* memory lock new objects - fixedgc */
lua_CFunction panic; /* to be called in unprotected errors */
struct lua_State *mainthread;
const lua_Number *version; /* pointer to version number */