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2004-02-26 Sebastian Wilhelmi <seppi@seppi.de> * glib/gatomic.c, glib/gatomic.h: New files to implement atomic operations for different platforms. Fixes bug #63621. * glib/glib.h: Include gatomic.h. * configure.in: Add test for assembler routines for atomic operations. * glib/Makefile.am: Add gatomic.c, gatomic.h. * tests/Makefile.am, tests/atomic-test.c: Unit test for atomic operations. * glib/glib-overrides.txt, glib/glib-sections.txt, glib/glib-docs.sgml, glib/tmpl/atomic_operations.sgml: Add docs for atomic operations.
179 lines
3.8 KiB
C
179 lines
3.8 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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* GAtomic: atomic integer operation.
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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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#include <glib.h>
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#ifdef G_THREADS_ENABLED
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# if !defined (G_ATOMIC_USE_FALLBACK_IMPLEMENTATION)
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/* We have an inline implementation, which we can now use for the
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* fallback implementation. This fallback implementation is only used by
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* modules, which are not compliled with gcc
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*/
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gint32
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g_atomic_int_exchange_and_add_fallback (gint32 *atomic,
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gint32 val)
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{
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return g_atomic_int_exchange_and_add (atomic, val);
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}
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void
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g_atomic_int_add_fallback (gint32 *atomic,
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gint32 val)
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{
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g_atomic_int_add (atomic, val);
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}
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gboolean
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g_atomic_int_compare_and_exchange_fallback (gint32 *atomic,
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gint32 oldval,
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gint32 newval)
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{
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return g_atomic_int_compare_and_exchange (atomic, oldval, newval);
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}
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gboolean
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g_atomic_pointer_compare_and_exchange_fallback (gpointer *atomic,
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gpointer oldval,
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gpointer newval)
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{
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return g_atomic_pointer_compare_and_exchange (atomic, oldval, newval);
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}
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gint32
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g_atomic_int_get_fallback (gint32 *atomic)
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{
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return g_atomic_int_get (atomic);
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}
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gint32
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g_atomic_pointer_get_fallback (gpointer *atomic)
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{
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return g_atomic_int_get (atomic);
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}
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# else /* !G_ATOMIC_USE_FALLBACK_IMPLEMENTATION */
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/* We have to use the slow, but safe locking method */
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G_LOCK_DEFINE_STATIC (g_atomic_lock);
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gint32
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g_atomic_int_exchange_and_add_fallback (gint32 *atomic,
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gint32 val)
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{
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gint32 result;
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G_LOCK (g_atomic_lock);
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result = *atomic;
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*atomic += val;
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G_UNLOCK (g_atomic_lock);
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return result;
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}
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void
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g_atomic_int_add_fallback (gint32 *atomic,
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gint32 val)
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{
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G_LOCK (g_atomic_lock);
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*atomic += val;
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G_UNLOCK (g_atomic_lock);
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}
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gboolean
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g_atomic_int_compare_and_exchange_fallback (gint32 *atomic,
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gint32 oldval,
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gint32 newval)
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{
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gboolean result;
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G_LOCK (g_atomic_lock);
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if (*atomic == oldval)
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{
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result = TRUE;
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*atomic = newval;
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}
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else
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result = FALSE;
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G_UNLOCK (g_atomic_lock);
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return result;
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}
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gboolean
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g_atomic_pointer_compare_and_exchange_fallback (gpointer *atomic,
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gpointer oldval,
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gpointer newval)
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{
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gboolean result;
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G_LOCK (g_atomic_lock);
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if (*atomic == oldval)
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{
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result = TRUE;
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*atomic = newval;
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}
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else
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result = FALSE;
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G_UNLOCK (g_atomic_lock);
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return result;
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}
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static inline gint32
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g_atomic_int_get_fallback (gint32 *atomic)
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{
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gint32 result;
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G_LOCK (g_atomic_lock);
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result = *atomic;
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G_UNLOCK (g_atomic_lock);
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return result;
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}
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static inline gpointer
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g_atomic_pointer_get_fallback (gpointer *atomic)
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{
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gpointer result;
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G_LOCK (g_atomic_lock);
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result = *atomic;
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G_UNLOCK (g_atomic_lock);
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return result;
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}
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# endif /* G_ATOMIC_USE_FALLBACK_IMPLEMENTATION */
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#else /* !G_THREADS_ENABLED */
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gint32 g_atomic_int_exchange_and_add (gint32 *atomic,
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gint32 val)
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{
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gint32 result = *atomic;
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*atomic += val;
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return result;
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}
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#endif /* G_THREADS_ENABLED */
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