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Lua Add Emergency Garbage Collector

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Derivative of work by RobertGabrielJakabosky
 http://lua-users.org/wiki/EmergencyGarbageCollector

I've only implemented the not enough memory part and
 expanded this idea to adding a mechanism to signal
 the OOM condition of the plugin buffer which allows us to only
 grab the playback buffer after garbage collection fails
 (SO THE MUSIC KEEPS PLAYING AS LONG AS POSSIBLE)

Change-Id: I684fb98b540ffc01f7ba324ab5b761ceb59b9f9b
This commit is contained in:
William Wilgus 2019-07-12 05:23:52 -05:00
parent 4beafe16fa
commit 45bd14b392
21 changed files with 266 additions and 68 deletions
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22
apps/plugins/lua/lapi.c
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@ -547,7 +547,9 @@ LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
lua_lock(L);
t = index2adr(L, idx);
api_checkvalidindex(L, t);
fixedstack(L);
setsvalue(L, &key, luaS_new(L, k));
unfixedstack(L);
luaV_gettable(L, t, &key, L->top);
api_incr_top(L);
lua_unlock(L);
@ -656,14 +658,14 @@ LUA_API void lua_settable (lua_State *L, int idx) {
LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
StkId t;
TValue key;
lua_lock(L);
api_checknelems(L, 1);
t = index2adr(L, idx);
api_checkvalidindex(L, t);
setsvalue(L, &key, luaS_new(L, k));
luaV_settable(L, t, &key, L->top - 1);
L->top--; /* pop value */
setsvalue2s(L, L->top, luaS_new(L, k));
api_incr_top(L);
luaV_settable(L, t, L->top - 1, L->top - 2);
L->top -= 2; /* pop key and value */
lua_unlock(L);
}
@ -674,7 +676,9 @@ LUA_API void lua_rawset (lua_State *L, int idx) {
api_checknelems(L, 2);
t = index2adr(L, idx);
api_check(L, ttistable(t));
fixedstack(L);
setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1);
unfixedstack(L);
luaC_barriert(L, hvalue(t), L->top-1);
L->top -= 2;
lua_unlock(L);
@ -687,7 +691,9 @@ LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
api_checknelems(L, 1);
o = index2adr(L, idx);
api_check(L, ttistable(o));
fixedstack(L);
setobj2t(L, luaH_setnum(L, hvalue(o), n), L->top-1);
unfixedstack(L);
luaC_barriert(L, hvalue(o), L->top-1);
L->top--;
lua_unlock(L);
@ -903,11 +909,11 @@ LUA_API int lua_gc (lua_State *L, int what, int data) {
g = G(L);
switch (what) {
case LUA_GCSTOP: {
g->GCthreshold = MAX_LUMEM;
set_block_gc(L);
break;
}
case LUA_GCRESTART: {
g->GCthreshold = g->totalbytes;
unset_block_gc(L);
break;
}
case LUA_GCCOLLECT: {
@ -924,6 +930,10 @@ LUA_API int lua_gc (lua_State *L, int what, int data) {
break;
}
case LUA_GCSTEP: {
if(is_block_gc(L)) {
res = 1; /* gc is block so we need to pretend that the collection cycle finished. */
break;
}
lu_mem a = (cast(lu_mem, data) << 10);
if (a <= g->totalbytes)
g->GCthreshold = g->totalbytes - a;