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106 lines
4.1 KiB
C
106 lines
4.1 KiB
C
/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* g_atomic_*: atomic operations.
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* Copyright (C) 2003 Sebastian Wilhelmi
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GLib Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GLib Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GLib at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#if defined(G_DISABLE_SINGLE_INCLUDES) && !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
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#error "Only <glib.h> can be included directly."
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#endif
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#ifndef __G_ATOMIC_H__
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#define __G_ATOMIC_H__
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#include <glib/gtypes.h>
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G_BEGIN_DECLS
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gint g_atomic_int_exchange_and_add (volatile gint G_GNUC_MAY_ALIAS *atomic,
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gint val);
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void g_atomic_int_add (volatile gint G_GNUC_MAY_ALIAS *atomic,
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gint val);
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gboolean g_atomic_int_compare_and_exchange (volatile gint G_GNUC_MAY_ALIAS *atomic,
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gint oldval,
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gint newval);
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gboolean g_atomic_pointer_compare_and_exchange (volatile gpointer G_GNUC_MAY_ALIAS *atomic,
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gpointer oldval,
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gpointer newval);
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gint g_atomic_int_get (volatile gint G_GNUC_MAY_ALIAS *atomic);
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void g_atomic_int_set (volatile gint G_GNUC_MAY_ALIAS *atomic,
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gint newval);
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gpointer g_atomic_pointer_get (volatile gpointer G_GNUC_MAY_ALIAS *atomic);
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void g_atomic_pointer_set (volatile gpointer G_GNUC_MAY_ALIAS *atomic,
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gpointer newval);
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#ifndef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED
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# define g_atomic_int_get(atomic) ((gint)*(atomic))
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# define g_atomic_int_set(atomic, newval) ((void) (*(atomic) = (newval)))
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# define g_atomic_pointer_get(atomic) ((gpointer)*(atomic))
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# define g_atomic_pointer_set(atomic, newval) ((void) (*(atomic) = (newval)))
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#else
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# define g_atomic_int_get(atomic) \
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((void) sizeof (gchar [sizeof (*(atomic)) == sizeof (gint) ? 1 : -1]), \
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(g_atomic_int_get) ((volatile gint G_GNUC_MAY_ALIAS *) (volatile void *) (atomic)))
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# define g_atomic_int_set(atomic, newval) \
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((void) sizeof (gchar [sizeof (*(atomic)) == sizeof (gint) ? 1 : -1]), \
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(g_atomic_int_set) ((volatile gint G_GNUC_MAY_ALIAS *) (volatile void *) (atomic), (newval)))
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# define g_atomic_pointer_get(atomic) \
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((void) sizeof (gchar [sizeof (*(atomic)) == sizeof (gpointer) ? 1 : -1]), \
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(g_atomic_pointer_get) ((volatile gpointer G_GNUC_MAY_ALIAS *) (volatile void *) (atomic)))
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# define g_atomic_pointer_set(atomic, newval) \
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((void) sizeof (gchar [sizeof (*(atomic)) == sizeof (gpointer) ? 1 : -1]), \
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(g_atomic_pointer_set) ((volatile gpointer G_GNUC_MAY_ALIAS *) (volatile void *) (atomic), (newval)))
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#endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */
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/**
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* g_atomic_int_inc:
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* @atomic: a pointer to an integer.
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*
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* Atomically increments the integer pointed to by @atomic by 1.
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*
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* Since: 2.4
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*/
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#define g_atomic_int_inc(atomic) (g_atomic_int_add ((atomic), 1))
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/**
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* g_atomic_int_dec_and_test:
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* @atomic: a pointer to an integer
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*
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* Atomically decrements the integer pointed to by @atomic by 1.
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*
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* Returns: %TRUE if the integer pointed to by @atomic is 0
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* after decrementing it
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*
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* Since: 2.4
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*/
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#define g_atomic_int_dec_and_test(atomic) \
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(g_atomic_int_exchange_and_add ((atomic), -1) == 1)
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G_END_DECLS
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#endif /* __G_ATOMIC_H__ */
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