no need to keep threads in a different GC list, now that there is the

'twups' list

lgc.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lgc.c,v 2.175 2014/02/15 13:12:01 roberto Exp roberto $
+** $Id: lgc.c,v 2.176 2014/02/18 13:39:37 roberto Exp roberto $
 ** Garbage Collector
 ** See Copyright Notice in lua.h
 */
@@ -954,7 +954,6 @@ void luaC_freeallobjects (lua_State *L) {
   g->gckind = KGC_NORMAL;
   sweepwholelist(L, &g->finobj);
   sweepwholelist(L, &g->allgc);
-  sweepwholelist(L, &g->mainthread->next);
   sweepwholelist(L, &g->fixedgc);  /* collect fixed objects */
   lua_assert(g->strt.nuse == 0);
 }
@@ -1046,9 +1045,6 @@ static lu_mem singlestep (lua_State *L) {
       return work + sw * GCSWEEPCOST;
     }
     case GCSswpallgc: {  /* sweep "regular" objects */
-      return sweepstep(L, g, GCSswpthreads, &g->mainthread->next);
-    }
-    case GCSswpthreads: {  /* sweep threads */
       return sweepstep(L, g, GCSswpfinobj, &g->finobj);
     }
     case GCSswpfinobj: {  /* sweep objects with finalizers */

lgc.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lgc.h,v 2.79 2014/02/13 14:46:38 roberto Exp roberto $
+** $Id: lgc.h,v 2.80 2014/02/14 16:43:14 roberto Exp roberto $
 ** Garbage Collector
 ** See Copyright Notice in lua.h
 */
@@ -39,12 +39,11 @@
 #define GCSpropagate	0
 #define GCSatomic	1
 #define GCSswpallgc	2
-#define GCSswpthreads	3
-#define GCSswpfinobj	4
-#define GCSswptobefnz	5
-#define GCSswpend	6
-#define GCScallfin	7
-#define GCSpause	8
+#define GCSswpfinobj	3
+#define GCSswptobefnz	4
+#define GCSswpend	5
+#define GCScallfin	6
+#define GCSpause	7
 
 
 #define issweepphase(g)  \

lstate.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.c,v 2.119 2014/02/13 14:46:38 roberto Exp roberto $
+** $Id: lstate.c,v 2.120 2014/02/18 13:39:37 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -260,9 +260,9 @@ LUA_API lua_State *lua_newthread (lua_State *L) {
   L1 = &cast(LX *, luaM_newobject(L, LUA_TTHREAD, sizeof(LX)))->l;
   L1->marked = luaC_white(g);
   L1->tt = LUA_TTHREAD;
-  /* link it on list of threads */
-  L1->next = g->mainthread->next;
-  g->mainthread->next = obj2gco(L1);
+  /* link it on list 'allgc' */
+  L1->next = g->allgc;
+  g->allgc = obj2gco(L1);
   setthvalue(L, L->top, L1);
   api_incr_top(L);
   preinit_thread(L1, g);

lstate.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.h,v 2.100 2014/02/13 14:46:38 roberto Exp roberto $
+** $Id: lstate.h,v 2.101 2014/02/18 13:39:37 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -21,7 +21,6 @@
 ** belong to one (and only one) of these lists, using field 'next' of
 ** the 'CommonHeader' for the link:
 **
-** mainthread->next: all threads;
 ** allgc: all objects not marked for finalization;
 ** finobj: all objects marked for finalization;
 ** tobefnz: all objects ready to be finalized; 

ltests.c

@@ -1,5 +1,5 @@
 /*
-** $Id: ltests.c,v 2.164 2014/02/13 12:11:34 roberto Exp roberto $
+** $Id: ltests.c,v 2.165 2014/02/15 13:12:01 roberto Exp roberto $
 ** Internal Module for Debugging of the Lua Implementation
 ** See Copyright Notice in lua.h
 */
@@ -426,14 +426,6 @@ int lua_checkmemory (lua_State *L) {
     checkobject(g, o, maybedead);
     lua_assert(!tofinalize(o));
   }
-  /* check thread list */
-  checkgray(g, obj2gco(g->mainthread));
-  maybedead = (GCSatomic < g->gcstate && g->gcstate <= GCSswpthreads);
-  for (o = obj2gco(g->mainthread); o != NULL; o = gch(o)->next) {
-    checkobject(g, o, maybedead);
-    lua_assert(!tofinalize(o));
-    lua_assert(gch(o)->tt == LUA_TTHREAD);
-  }
   /* check 'finobj' list */
   checkgray(g, g->finobj);
   for (o = g->finobj; o != NULL; o = gch(o)->next) {
@@ -615,12 +607,10 @@ static int gc_color (lua_State *L) {
 
 
 static int gc_state (lua_State *L) {
-  static const char *statenames[] = {"propagate", "atomic",
-    "sweepallgc", "sweepthreads", "sweepfinobj",
-    "sweeptobefnz", "sweepend", "pause", ""};
-  static const int states[] = {GCSpropagate, GCSatomic,
-    GCSswpallgc, GCSswpthreads, GCSswpfinobj,
-    GCSswptobefnz, GCSswpend, GCSpause, -1};
+  static const char *statenames[] = {"propagate", "atomic", "sweepallgc",
+      "sweepfinobj", "sweeptobefnz", "sweepend", "pause", ""};
+  static const int states[] = {GCSpropagate, GCSatomic, GCSswpallgc,
+      GCSswpfinobj, GCSswptobefnz, GCSswpend, GCSpause, -1};
   int option = states[luaL_checkoption(L, 1, "", statenames)];
   if (option == -1) {
     lua_pushstring(L, statenames[G(L)->gcstate]);