Branch: Tag:

2007-05-26

2007-05-26 19:14:59 by Martin Stjernholm <mast@lysator.liu.se>

Added a PROGRAM_LIVE_OBJ flag to be able to accurately detect exit callbacks
in inherits. It also allows users to override the assumption that an exit or
event callback makes it necessary for the gc to treat the objects as live.

Rev: src/gc.c:1.286
Rev: src/gc.h:1.128
Rev: src/object.c:1.274
Rev: src/program.c:1.616
Rev: src/program.h:1.229

2:   || This file is part of Pike. For copyright information see COPYRIGHT.   || Pike is distributed under GPL, LGPL and MPL. See the file COPYING   || for more information. - || $Id: program.h,v 1.228 2007/03/31 22:59:53 marcus Exp $ + || $Id: program.h,v 1.229 2007/05/26 19:14:59 mast Exp $   */      #ifndef PROGRAM_H
486:   #define PROGRAM_VIRGIN 0x800      /* Don't allow the program to be inherited or cloned if there's no -  * parent object. Only set if PROGRAM_USES_PARENT is. */ +  * parent object. Might only be set if PROGRAM_USES_PARENT is. */   #define PROGRAM_NEEDS_PARENT 0x1000    -  + /* Program has code to be executed when it's destructed. This causes +  * the gc to consider objects of this program to be "live" and will +  * take care to ensure a good destruct sequence so that other +  * referenced things are intact as far as possible when the object is +  * destructed. See the blurb near the top of gc.c for further +  * discussion. +  * +  * This flag gets set automatically when an event handler that might +  * act on PROG_EVENT_EXIT is installed (i.e. through set_exit_callback +  * or pike_set_prog_event_callback). However, if the handler is very +  * simple then this flag may be cleared again to allow the gc to +  * handle objects of this program more efficiently (by considering +  * them "dead" and destroy them in an arbitrary order). +  * +  * Such a "very simple" handler should only do things like freeing +  * pointers and clearing variables in the object storage. It can not +  * assume that any other context is intact when it's called. It might +  * even get called after the module exit function, which means that +  * this optimization trick can never be used in a dynamically loaded +  * module. */ + #define PROGRAM_LIVE_OBJ 0x2000 +    /* Indicates that the class is a facet or product_class. */   #define PROGRAM_IS_FACET_CLASS 0x1   #define PROGRAM_IS_PRODUCT_CLASS 0x2