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14952 fschmid 1
/* cairo - a vector graphics library with display and print output
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 *
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 * Copyright © 2007 Chris Wilson
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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 either under the terms of the GNU Lesser General Public
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 * License version 2.1 as published by the Free Software Foundation
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 * (the "LGPL") or, at your option, under the terms of the Mozilla
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 * Public License Version 1.1 (the "MPL"). If you do not alter this
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 * notice, a recipient may use your version of this file under either
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 * the MPL or the LGPL.
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 *
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 * You should have received a copy of the LGPL along with this library
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 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
14952 fschmid 16
 * You should have received a copy of the MPL along with this library
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 * in the file COPYING-MPL-1.1
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 *
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 * The contents of this file are subject to the Mozilla Public License
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 * Version 1.1 (the "License"); you may not use this file except in
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 * compliance with the License. You may obtain a copy of the License at
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 * http://www.mozilla.org/MPL/
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 *
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 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
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 * the specific language governing rights and limitations.
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 *
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 * The Original Code is the cairo graphics library.
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 *
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 * Contributor(s):
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 *      Chris Wilson <chris@chris-wilson.co.uk>
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 */
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#include "cairoint.h"
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#include "cairo-atomic-private.h"
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#include "cairo-mutex-private.h"
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#ifdef HAS_ATOMIC_OPS
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COMPILE_TIME_ASSERT(sizeof(void*) == sizeof(int) ||
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                    sizeof(void*) == sizeof(long) ||
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                    sizeof(void*) == sizeof(long long));
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#else
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void
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_cairo_atomic_int_inc (int *x)
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{
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    CAIRO_MUTEX_LOCK (_cairo_atomic_mutex);
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    *x += 1;
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    CAIRO_MUTEX_UNLOCK (_cairo_atomic_mutex);
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}
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cairo_bool_t
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_cairo_atomic_int_dec_and_test (int *x)
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{
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    cairo_bool_t ret;
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    CAIRO_MUTEX_LOCK (_cairo_atomic_mutex);
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    ret = --*x == 0;
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    CAIRO_MUTEX_UNLOCK (_cairo_atomic_mutex);
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    return ret;
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}
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int
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_cairo_atomic_int_cmpxchg (int *x, int oldv, int newv)
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{
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    int ret;
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    CAIRO_MUTEX_LOCK (_cairo_atomic_mutex);
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    ret = *x;
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    if (ret == oldv)
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        *x = newv;
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    CAIRO_MUTEX_UNLOCK (_cairo_atomic_mutex);
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    return ret;
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}
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void *
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_cairo_atomic_ptr_cmpxchg (void **x, void *oldv, void *newv)
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{
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    void *ret;
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    CAIRO_MUTEX_LOCK (_cairo_atomic_mutex);
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    ret = *x;
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    if (ret == oldv)
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        *x = newv;
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    CAIRO_MUTEX_UNLOCK (_cairo_atomic_mutex);
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    return ret;
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}
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#endif
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#ifdef ATOMIC_OP_NEEDS_MEMORY_BARRIER
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int
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_cairo_atomic_int_get (int *x)
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{
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    int ret;
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    CAIRO_MUTEX_LOCK (_cairo_atomic_mutex);
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    ret = *x;
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    CAIRO_MUTEX_UNLOCK (_cairo_atomic_mutex);
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    return ret;
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}
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void
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_cairo_atomic_int_set (int *x, int value)
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{
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    CAIRO_MUTEX_LOCK (_cairo_atomic_mutex);
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    *x = value;
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    CAIRO_MUTEX_UNLOCK (_cairo_atomic_mutex);
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}
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#endif