1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798 |
- /*
- * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER );
-
- #include <stdlib.h>
- #include <ipxe/refcnt.h>
-
- /** @file
- *
- * Reference counting
- *
- */
-
- /**
- * Increment reference count
- *
- * @v refcnt Reference counter, or NULL
- *
- * If @c refcnt is NULL, no action is taken.
- */
- void ref_increment ( struct refcnt *refcnt ) {
-
- if ( refcnt ) {
- refcnt->count++;
- DBGC2 ( refcnt, "REFCNT %p incremented to %d\n",
- refcnt, refcnt->count );
- }
- }
-
- /**
- * Decrement reference count
- *
- * @v refcnt Reference counter, or NULL
- *
- * If the reference count decreases below zero, the object's free()
- * method will be called.
- *
- * If @c refcnt is NULL, no action is taken.
- */
- void ref_decrement ( struct refcnt *refcnt ) {
-
- if ( ! refcnt )
- return;
-
- refcnt->count--;
- DBGC2 ( refcnt, "REFCNT %p decremented to %d\n",
- refcnt, refcnt->count );
-
- if ( refcnt->count >= 0 )
- return;
-
- if ( refcnt->count < -1 ) {
- DBGC ( refcnt, "REFCNT %p decremented too far (%d)!\n",
- refcnt, refcnt->count );
- /* Avoid multiple calls to free(), which typically
- * result in memory corruption that is very hard to
- * track down.
- */
- return;
- }
-
- if ( refcnt->free ) {
- DBGC ( refcnt, "REFCNT %p being freed via method %p\n",
- refcnt, refcnt->free );
- refcnt->free ( refcnt );
- } else {
- DBGC ( refcnt, "REFCNT %p being freed\n", refcnt );
- free ( refcnt );
- }
- }
-
- /**
- * Do not free reference-counted object
- *
- * @v refcnt Reference counter
- *
- * This is meant for initializing a reference counter structure in a
- * statically allocated object.
- */
- void ref_no_free ( struct refcnt *refcnt __unused ) {
- /* Do nothing */
- }
|