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registry and global table may be changed through the API without a 

write barrier, so GC should visit them in the atomic phase.
This commit is contained in:
Roberto Ierusalimschy 2009-11-09 16:29:21 -02:00
parent 2583bac3d3
commit 88eb901f81
2 changed files with 7 additions and 3 deletions
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5
lapi.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lapi.c,v 2.96 2009/11/05 17:26:00 roberto Exp roberto $ ** $Id: lapi.c,v 2.97 2009/11/06 17:03:37 roberto Exp roberto $
** Lua API ** Lua API
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -199,7 +199,8 @@ static void moveto (lua_State *L, TValue *fr, int idx) {
if (idx < LUA_GLOBALSINDEX) /* function upvalue? */ if (idx < LUA_GLOBALSINDEX) /* function upvalue? */
luaC_barrier(L, curr_func(L), fr); luaC_barrier(L, curr_func(L), fr);
} }
/* LUA_GLOBALSINDEX does not need gc barrier (threads are never black) */ /* LUA_GLOBALSINDEX and LUA_REGISTRYINDEX do not need gc barrier
(collector revisits them before finishing collection) */
} }

5
lgc.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lgc.c,v 2.59 2009/11/05 17:43:54 roberto Exp roberto $ ** $Id: lgc.c,v 2.60 2009/11/06 17:06:19 roberto Exp roberto $
** Garbage Collector ** Garbage Collector
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -709,6 +709,9 @@ void luaC_freeall (lua_State *L) {
static void atomic (lua_State *L) { static void atomic (lua_State *L) {
global_State *g = G(L); global_State *g = G(L);
size_t udsize; /* total size of userdata to be finalized */ size_t udsize; /* total size of userdata to be finalized */
/* global table and registry may be changed by API */
markvalue(g, &g->l_gt);
markvalue(g, &g->l_registry);
/* remark occasional upvalues of (maybe) dead threads */ /* remark occasional upvalues of (maybe) dead threads */
g->gcstate = GCSatomic; g->gcstate = GCSatomic;
remarkupvals(g); remarkupvals(g);