1 /* cairo - a vector graphics library with display and print output 2 * 3 * Copyright © 2007 Chris Wilson 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it either under the terms of the GNU Lesser General Public 7 * License version 2.1 as published by the Free Software Foundation 8 * (the "LGPL") or, at your option, under the terms of the Mozilla 9 * Public License Version 1.1 (the "MPL"). If you do not alter this 10 * notice, a recipient may use your version of this file under either 11 * the MPL or the LGPL. 12 * 13 * You should have received a copy of the LGPL along with this library 14 * in the file COPYING-LGPL-2.1; if not, write to the Free Software 15 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA 16 * You should have received a copy of the MPL along with this library 17 * in the file COPYING-MPL-1.1 18 * 19 * The contents of this file are subject to the Mozilla Public License 20 * Version 1.1 (the "License"); you may not use this file except in 21 * compliance with the License. You may obtain a copy of the License at 22 * http://www.mozilla.org/MPL/ 23 * 24 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY 25 * OF ANY KIND, either express or implied. See the LGPL or the MPL for 26 * the specific language governing rights and limitations. 27 * 28 * The Original Code is the cairo graphics library. 29 * 30 * The Initial Developer of the Original Code is University of Southern 31 * California. 32 * 33 * Contributor(s): 34 * Chris Wilson <chris@chris-wilson.co.uk> 35 */ 36 37 #ifndef CAIRO_REFRENCE_COUNT_PRIVATE_H 38 #define CAIRO_REFRENCE_COUNT_PRIVATE_H 39 40 #include "cairo-atomic-private.h" 41 42 /* Encapsulate operations on the object's reference count */ 43 typedef struct { 44 cairo_atomic_int_t ref_count; 45 } cairo_reference_count_t; 46 47 #define _cairo_reference_count_inc(RC) _cairo_atomic_int_inc (&(RC)->ref_count) 48 #define _cairo_reference_count_dec(RC) _cairo_atomic_int_dec (&(RC)->ref_count) 49 #define _cairo_reference_count_dec_and_test(RC) _cairo_atomic_int_dec_and_test (&(RC)->ref_count) 50 51 #define CAIRO_REFERENCE_COUNT_INIT(RC, VALUE) ((RC)->ref_count = (VALUE)) 52 53 #define CAIRO_REFERENCE_COUNT_GET_VALUE(RC) _cairo_atomic_int_get (&(RC)->ref_count) 54 55 #define CAIRO_REFERENCE_COUNT_INVALID_VALUE ((cairo_atomic_int_t) -1) 56 #define CAIRO_REFERENCE_COUNT_INVALID {CAIRO_REFERENCE_COUNT_INVALID_VALUE} 57 58 #define CAIRO_REFERENCE_COUNT_IS_INVALID(RC) (CAIRO_REFERENCE_COUNT_GET_VALUE (RC) == CAIRO_REFERENCE_COUNT_INVALID_VALUE) 59 60 #define CAIRO_REFERENCE_COUNT_HAS_REFERENCE(RC) (CAIRO_REFERENCE_COUNT_GET_VALUE (RC) > 0) 61 62 #endif 63