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71120727e1
Since the objects can be shared and may be in use simultaneously across multiple threads, setting the status needs to be atomic. We use a locked compare and exchange in order to avoid overwriting an existing error - that is we use an atomic operation that only sets the new status value if the current value is CAIRO_STATUS_SUCCESS.
94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* 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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#ifndef CAIRO_HAS_ATOMIC_OPS
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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_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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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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#endif
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