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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 2092934721
commit f2ca0c144b
4 changed files with 16 additions and 3 deletions
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15
libs/lua/lua-5.3.4/lgc.c
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@ -210,8 +210,14 @@ GCObject *luaC_newobj (lua_State *L, int tt, size_t sz) {
GCObject *o = cast(GCObject *, luaM_newobject(L, novariant(tt), sz));
o->marked = luaC_white(g);
o->tt = tt;
o->next = g->allgc;
g->allgc = o;
if (g->gcmlock) {
white2gray(o); /* gray forever */
o->next = g->fixedgc;
g->fixedgc = o;
} else {
o->next = g->allgc;
g->allgc = o;
}
return o;
}
@ -1175,4 +1181,7 @@ void luaC_fullgc (lua_State *L, int isemergency) {
/* }====================================================== */
LUA_API void lua_mlock (lua_State *L, int en) {
global_State *g = G(L);
g->gcmlock = en;
}