diff options
Diffstat (limited to 'debian/grub-extras/disabled/gpxe/src/core/refcnt.c')
-rw-r--r-- | debian/grub-extras/disabled/gpxe/src/core/refcnt.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/debian/grub-extras/disabled/gpxe/src/core/refcnt.c b/debian/grub-extras/disabled/gpxe/src/core/refcnt.c new file mode 100644 index 0000000..f2286ca --- /dev/null +++ b/debian/grub-extras/disabled/gpxe/src/core/refcnt.c @@ -0,0 +1,78 @@ +/* + * 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 ); + } +} |