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double-linked list of all upvalues elliminated and changed to a

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traversal of all non-marked threads
This commit is contained in:
Roberto Ierusalimschy
2013-08-07 09:18:11 -03:00
parent 677d90165f
commit 623e388bb4
7 changed files with 47 additions and 72 deletions
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20
lstate.h
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@@ -1,5 +1,5 @@
/*
** $Id: lstate.h,v 2.82 2012/07/02 13:37:04 roberto Exp roberto $
** $Id: lstate.h,v 2.83 2013/08/05 16:58:28 roberto Exp roberto $
** Global State
** See Copyright Notice in lua.h
*/
@@ -20,17 +20,18 @@
** be kept somehow accessible until being freed.
**
** Lua keeps most objects linked in list g->allgc. The link uses field
** 'next' of the CommonHeader.
** 'next' of the CommonHeader. Threads (except the main one) ar kept
** at the end of the 'allgc' list, after the 'l_registry' (which is
** the first object to be added to the list).
**
** Strings are kept in several lists headed by the array g->strt.hash.
** Short strings are kept in several lists headed by the array g->strt.hash.
**
** Open upvalues are not subject to independent garbage collection. They
** are collected together with their respective threads. Lua keeps a
** double-linked list with all open upvalues (g->uvhead) so that it can
** mark objects referred by them. (They are always gray, so they must
** be remarked in the atomic step. Usually their contents would be marked
** when traversing the respective threads, but the thread may already be
** dead, while the upvalue is still accessible through closures.)
** are collected together with their respective threads. (They are
** always gray, so they must be remarked in the atomic step. Usually
** their contents would be marked when traversing the respective
** threads, but the thread may already be dead, while the upvalue is
** still accessible through closures.)
**
** Objects with finalizers are kept in the list g->finobj.
**
@@ -133,7 +134,6 @@ typedef struct global_State {
GCObject *ephemeron; /* list of ephemeron tables (weak keys) */
GCObject *allweak; /* list of all-weak tables */
GCObject *tobefnz; /* list of userdata to be GC */
UpVal uvhead; /* head of double-linked list of all open upvalues */
Mbuffer buff; /* temporary buffer for string concatenation */
int gcpause; /* size of pause between successive GCs */
int gcstepmul; /* GC `granularity' */