| /* |
| * 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 <gpxe/refcnt.h> |
| |
| /** @file |
| * |
| * Reference counting |
| * |
| */ |
| |
| /** |
| * Increment reference count |
| * |
| * @v refcnt Reference counter, or NULL |
| * @ret refcnt Reference counter |
| * |
| * If @c refcnt is NULL, no action is taken. |
| */ |
| struct refcnt * ref_get ( struct refcnt *refcnt ) { |
| |
| if ( refcnt ) { |
| refcnt->refcnt++; |
| DBGC2 ( refcnt, "REFCNT %p incremented to %d\n", |
| refcnt, refcnt->refcnt ); |
| } |
| return refcnt; |
| } |
| |
| /** |
| * 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_put ( struct refcnt *refcnt ) { |
| |
| if ( ! refcnt ) |
| return; |
| |
| refcnt->refcnt--; |
| DBGC2 ( refcnt, "REFCNT %p decremented to %d\n", |
| refcnt, refcnt->refcnt ); |
| |
| if ( refcnt->refcnt >= 0 ) |
| 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 ); |
| } |
| } |