1 /* GLIB - Library of useful routines for C programming 2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald 3 * 4 * g_atomic_*: atomic operations. 5 * Copyright (C) 2003 Sebastian Wilhelmi 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this library; if not, write to the 19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 20 * Boston, MA 02111-1307, USA. 21 */ 22 23 /* 24 * Modified by the GLib Team and others 1997-2000. See the AUTHORS 25 * file for a list of people on the GLib Team. See the ChangeLog 26 * files for a list of changes. These files are distributed with 27 * GLib at ftp://ftp.gtk.org/pub/gtk/. 28 */ 29 30 #if defined(G_DISABLE_SINGLE_INCLUDES) && !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION) 31 #error "Only <glib.h> can be included directly." 32 #endif 33 34 #ifndef __G_ATOMIC_H__ 35 #define __G_ATOMIC_H__ 36 37 #include <glib/gtypes.h> 38 39 G_BEGIN_DECLS 40 41 gint g_atomic_int_exchange_and_add (volatile gint G_GNUC_MAY_ALIAS *atomic, 42 gint val); 43 void g_atomic_int_add (volatile gint G_GNUC_MAY_ALIAS *atomic, 44 gint val); 45 gboolean g_atomic_int_compare_and_exchange (volatile gint G_GNUC_MAY_ALIAS *atomic, 46 gint oldval, 47 gint newval); 48 gboolean g_atomic_pointer_compare_and_exchange (volatile gpointer G_GNUC_MAY_ALIAS *atomic, 49 gpointer oldval, 50 gpointer newval); 51 52 gint g_atomic_int_get (volatile gint G_GNUC_MAY_ALIAS *atomic); 53 void g_atomic_int_set (volatile gint G_GNUC_MAY_ALIAS *atomic, 54 gint newval); 55 gpointer g_atomic_pointer_get (volatile gpointer G_GNUC_MAY_ALIAS *atomic); 56 void g_atomic_pointer_set (volatile gpointer G_GNUC_MAY_ALIAS *atomic, 57 gpointer newval); 58 59 #ifndef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED 60 # define g_atomic_int_get(atomic) ((gint)*(atomic)) 61 # define g_atomic_int_set(atomic, newval) ((void) (*(atomic) = (newval))) 62 # define g_atomic_pointer_get(atomic) ((gpointer)*(atomic)) 63 # define g_atomic_pointer_set(atomic, newval) ((void) (*(atomic) = (newval))) 64 #else 65 # define g_atomic_int_get(atomic) \ 66 ((void) sizeof (gchar [sizeof (*(atomic)) == sizeof (gint) ? 1 : -1]), \ 67 (g_atomic_int_get) ((volatile gint G_GNUC_MAY_ALIAS *) (void *) (atomic))) 68 # define g_atomic_int_set(atomic, newval) \ 69 ((void) sizeof (gchar [sizeof (*(atomic)) == sizeof (gint) ? 1 : -1]), \ 70 (g_atomic_int_set) ((volatile gint G_GNUC_MAY_ALIAS *) (void *) (atomic), (newval))) 71 # define g_atomic_pointer_get(atomic) \ 72 ((void) sizeof (gchar [sizeof (*(atomic)) == sizeof (gpointer) ? 1 : -1]), \ 73 (g_atomic_pointer_get) ((volatile gpointer G_GNUC_MAY_ALIAS *) (void *) (atomic))) 74 # define g_atomic_pointer_set(atomic, newval) \ 75 ((void) sizeof (gchar [sizeof (*(atomic)) == sizeof (gpointer) ? 1 : -1]), \ 76 (g_atomic_pointer_set) ((volatile gpointer G_GNUC_MAY_ALIAS *) (void *) (atomic), (newval))) 77 #endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */ 78 79 #define g_atomic_int_inc(atomic) (g_atomic_int_add ((atomic), 1)) 80 #define g_atomic_int_dec_and_test(atomic) \ 81 (g_atomic_int_exchange_and_add ((atomic), -1) == 1) 82 83 G_END_DECLS 84 85 #endif /* __G_ATOMIC_H__ */ 86
