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ea39f0302a
AO_compare_and_swap_full() doesn't have the same semantic as _cairo_atomic_int_cmpxchg(). The former returns a TRUE on success FALSE otherwise while the later returns the atomic value.
160 lines
4.9 KiB
C
160 lines
4.9 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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* The Initial Developer of the Original Code is University of Southern
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* California.
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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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#ifndef CAIRO_ATOMIC_PRIVATE_H
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#define CAIRO_ATOMIC_PRIVATE_H
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# include "cairo-compiler-private.h"
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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/* The autoconf on OpenBSD 4.5 produces the malformed constant name
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* SIZEOF_VOID__ rather than SIZEOF_VOID_P. Work around that here. */
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#if !defined(SIZEOF_VOID_P) && defined(SIZEOF_VOID__)
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# define SIZEOF_VOID_P SIZEOF_VOID__
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#endif
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CAIRO_BEGIN_DECLS
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#if HAVE_INTEL_ATOMIC_PRIMITIVES
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#define HAS_ATOMIC_OPS 1
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typedef int cairo_atomic_int_t;
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# define _cairo_atomic_int_get(x) (*x)
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# define _cairo_atomic_int_set(x, value) ((*x) = value)
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# define _cairo_atomic_int_inc(x) ((void) __sync_fetch_and_add(x, 1))
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# define _cairo_atomic_int_dec_and_test(x) (__sync_fetch_and_add(x, -1) == 1)
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# define _cairo_atomic_int_cmpxchg(x, oldv, newv) __sync_val_compare_and_swap (x, oldv, newv)
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#if SIZEOF_VOID_P==SIZEOF_INT
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typedef int cairo_atomic_intptr_t;
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#elif SIZEOF_VOID_P==SIZEOF_LONG
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typedef long cairo_atomic_intptr_t;
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#elif SIZEOF_VOID_P==SIZEOF_LONG_LONG
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typedef long long cairo_atomic_intptr_t;
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#else
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#error No matching integer pointer type
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#endif
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# define _cairo_atomic_ptr_cmpxchg(x, oldv, newv) \
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(void*)__sync_val_compare_and_swap ((cairo_atomic_intptr_t*)x, (cairo_atomic_intptr_t)oldv, (cairo_atomic_intptr_t)newv)
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#endif
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#if HAVE_LIB_ATOMIC_OPS
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#include <atomic_ops.h>
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#define HAS_ATOMIC_OPS 1
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typedef AO_t cairo_atomic_int_t;
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# define _cairo_atomic_int_get(x) (AO_load_full (x))
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# define _cairo_atomic_int_set(x, value) (AO_store_full (x))
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# define _cairo_atomic_int_inc(x) ((void) AO_fetch_and_add1_full(x))
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# define _cairo_atomic_int_dec_and_test(x) (AO_fetch_and_sub1_full(x) == 1)
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# define _cairo_atomic_int_cmpxchg(x, oldv, newv) ((cairo_atomic_int_t) AO_compare_and_swap_full(x, oldv, newv) ? oldv : *x)
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#if SIZEOF_VOID_P==SIZEOF_INT
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typedef unsigned int cairo_atomic_intptr_t;
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#elif SIZEOF_VOID_P==SIZEOF_LONG
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typedef unsigned long cairo_atomic_intptr_t;
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#elif SIZEOF_VOID_P==SIZEOF_LONG_LONG
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typedef unsigned long long cairo_atomic_intptr_t;
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#else
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#error No matching integer pointer type
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#endif
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# define _cairo_atomic_ptr_cmpxchg(x, oldv, newv) \
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(void*) (cairo_atomic_intptr_t) _cairo_atomic_int_cmpxchg ((cairo_atomic_intptr_t*)(x), (cairo_atomic_intptr_t)oldv, (cairo_atomic_intptr_t)newv)
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#endif
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#ifndef HAS_ATOMIC_OPS
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typedef int cairo_atomic_int_t;
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cairo_private void
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_cairo_atomic_int_inc (int *x);
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cairo_private cairo_bool_t
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_cairo_atomic_int_dec_and_test (int *x);
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cairo_private int
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_cairo_atomic_int_cmpxchg (int *x, int oldv, int newv);
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cairo_private void *
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_cairo_atomic_ptr_cmpxchg (void **x, void *oldv, void *newv);
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#ifdef ATOMIC_OP_NEEDS_MEMORY_BARRIER
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# include "cairo-compiler-private.h"
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cairo_private int
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_cairo_atomic_int_get (int *x);
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cairo_private void
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_cairo_atomic_int_set (int *x, int value);
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#else
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# define _cairo_atomic_int_get(x) (*x)
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# define _cairo_atomic_int_set(x, value) ((*x) = value)
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#endif
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#endif
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#define _cairo_atomic_uint_get(x) _cairo_atomic_int_get(x)
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#define _cairo_atomic_uint_cmpxchg(x, oldv, newv) \
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_cairo_atomic_int_cmpxchg((cairo_atomic_int_t *)x, oldv, newv)
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#define _cairo_status_set_error(status, err) do { \
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/* hide compiler warnings about cairo_status_t != int (gcc treats its as \
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* an unsigned integer instead, and about ignoring the return value. */ \
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int ret__ = _cairo_atomic_int_cmpxchg ((cairo_atomic_int_t *) status, CAIRO_STATUS_SUCCESS, err); \
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(void) ret__; \
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} while (0)
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CAIRO_END_DECLS
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#endif
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