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added comment explaining a bit about the invariants of the collector

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Roberto Ierusalimschy 2010-04-30 15:36:45 -03:00
parent dc2b8a0073
commit b9e1dec2cb
1 changed files with 14 additions and 1 deletions
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15
lgc.h
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@ -1,5 +1,5 @@
/* /*
** $Id: lgc.h,v 2.31 2010/04/29 17:32:40 roberto Exp roberto $ ** $Id: lgc.h,v 2.32 2010/04/29 21:43:36 roberto Exp roberto $
** Garbage Collector ** Garbage Collector
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -11,6 +11,19 @@
#include "lobject.h" #include "lobject.h"
#include "lstate.h" #include "lstate.h"
/*
** Collectable objects may have one of three colors: white, which
** means the object is not marked; gray, which means the
** object is marked, but its references may be not marked; and
** black, which means that the object and all its references are marked.
** The main invariant of the garbage collector, while marking objects,
** is that a black object can never point to a white one. Moreover,
** any gray object must be in a "gray list" (gray, grayagain, weak,
** allweak, ephemeron) so that it can be visited again before finishing
** the collection cycle. These lists have no meaning when the invariant
** is not being enforced (e.g., sweep phase).
*/
/* /*
** Possible states of the Garbage Collector ** Possible states of the Garbage Collector