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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* g_atomic_*: atomic operations.
* Copyright (C) 2003 Sebastian Wilhelmi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
#if defined(G_DISABLE_SINGLE_INCLUDES) && !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
#error "Only <glib.h> can be included directly."
#endif
#ifndef __G_ATOMIC_H__
#define __G_ATOMIC_H__
#include <glib/gtypes.h>
G_BEGIN_DECLS
gint g_atomic_int_exchange_and_add (volatile gint G_GNUC_MAY_ALIAS *atomic,
gint val);
void g_atomic_int_add (volatile gint G_GNUC_MAY_ALIAS *atomic,
gint val);
gboolean g_atomic_int_compare_and_exchange (volatile gint G_GNUC_MAY_ALIAS *atomic,
gint oldval,
gint newval);
gboolean g_atomic_pointer_compare_and_exchange (volatile gpointer G_GNUC_MAY_ALIAS *atomic,
gpointer oldval,
gpointer newval);
gint g_atomic_int_get (volatile gint G_GNUC_MAY_ALIAS *atomic);
void g_atomic_int_set (volatile gint G_GNUC_MAY_ALIAS *atomic,
gint newval);
gpointer g_atomic_pointer_get (volatile gpointer G_GNUC_MAY_ALIAS *atomic);
void g_atomic_pointer_set (volatile gpointer G_GNUC_MAY_ALIAS *atomic,
gpointer newval);
#ifndef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED
# define g_atomic_int_get(atomic) ((gint)*(atomic))
# define g_atomic_int_set(atomic, newval) ((void) (*(atomic) = (newval)))
# define g_atomic_pointer_get(atomic) ((gpointer)*(atomic))
# define g_atomic_pointer_set(atomic, newval) ((void) (*(atomic) = (newval)))
#else
# define g_atomic_int_get(atomic) \
((void) sizeof (gchar [sizeof (*(atomic)) == sizeof (gint) ? 1 : -1]), \
(g_atomic_int_get) ((volatile gint G_GNUC_MAY_ALIAS *) (volatile void *) (atomic)))
# define g_atomic_int_set(atomic, newval) \
((void) sizeof (gchar [sizeof (*(atomic)) == sizeof (gint) ? 1 : -1]), \
(g_atomic_int_set) ((volatile gint G_GNUC_MAY_ALIAS *) (volatile void *) (atomic), (newval)))
# define g_atomic_pointer_get(atomic) \
((void) sizeof (gchar [sizeof (*(atomic)) == sizeof (gpointer) ? 1 : -1]), \
(g_atomic_pointer_get) ((volatile gpointer G_GNUC_MAY_ALIAS *) (volatile void *) (atomic)))
# define g_atomic_pointer_set(atomic, newval) \
((void) sizeof (gchar [sizeof (*(atomic)) == sizeof (gpointer) ? 1 : -1]), \
(g_atomic_pointer_set) ((volatile gpointer G_GNUC_MAY_ALIAS *) (volatile void *) (atomic), (newval)))
#endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */
/**
* g_atomic_int_inc:
* @atomic: a pointer to an integer.
*
* Atomically increments the integer pointed to by @atomic by 1.
*
* Since: 2.4
*/
#define g_atomic_int_inc(atomic) (g_atomic_int_add ((atomic), 1))
/**
* g_atomic_int_dec_and_test:
* @atomic: a pointer to an integer
*
* Atomically decrements the integer pointed to by @atomic by 1.
*
* Returns: %TRUE if the integer pointed to by @atomic is 0
* after decrementing it
*
* Since: 2.4
*/
#define g_atomic_int_dec_and_test(atomic) \
(g_atomic_int_exchange_and_add ((atomic), -1) == 1)
G_END_DECLS
#endif /* __G_ATOMIC_H__ */
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