src/cairo-atomic-private.h

   1 /* cairo - a vector graphics library with display and print output
   2  *
   3  * Copyright © 2007 Chris Wilson
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it either under the terms of the GNU Lesser General Public
   7  * License version 2.1 as published by the Free Software Foundation
   8  * (the "LGPL") or, at your option, under the terms of the Mozilla
   9  * Public License Version 1.1 (the "MPL"). If you do not alter this
  10  * notice, a recipient may use your version of this file under either
  11  * the MPL or the LGPL.
  12  *
  13  * You should have received a copy of the LGPL along with this library
  14  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  16  * You should have received a copy of the MPL along with this library
  17  * in the file COPYING-MPL-1.1
  18  *
  19  * The contents of this file are subject to the Mozilla Public License
  20  * Version 1.1 (the "License"); you may not use this file except in
  21  * compliance with the License. You may obtain a copy of the License at
  22  * http://www.mozilla.org/MPL/
  23  *
  24  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
  25  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
  26  * the specific language governing rights and limitations.
  27  *
  28  * The Original Code is the cairo graphics library.
  29  *
  30  * The Initial Developer of the Original Code is University of Southern
  31  * California.
  32  *
  33  * Contributor(s):
  34  *      Chris Wilson <chris@chris-wilson.co.uk>
  35  */
  36
  37 #ifndef CAIRO_ATOMIC_PRIVATE_H
  38 #define CAIRO_ATOMIC_PRIVATE_H
  39
  40 # include "cairo-compiler-private.h"
  41
  42 #if HAVE_CONFIG_H
  43 #include "config.h"
  44 #endif
  45
  46 CAIRO_BEGIN_DECLS
  47
  48 #if HAVE_INTEL_ATOMIC_PRIMITIVES
  49
  50 #define HAS_ATOMIC_OPS 1
  51
  52 typedef int cairo_atomic_int_t;
  53
  54 # define _cairo_atomic_int_inc(x) ((void) __sync_fetch_and_add(x, 1))
  55 # define _cairo_atomic_int_dec_and_test(x) (__sync_fetch_and_add(x, -1) == 1)
  56 # define _cairo_atomic_int_cmpxchg(x, oldv, newv) __sync_val_compare_and_swap (x, oldv, newv)
  57
  58 #if SIZEOF_VOID_P==SIZEOF_INT
  59 typedef int cairo_atomic_intptr_t;
  60 #elif SIZEOF_VOID_P==SIZEOF_LONG
  61 typedef long cairo_atomic_intptr_t;
  62 #elif SIZEOF_VOID_P==SIZEOF_LONG_LONG
  63 typedef long long cairo_atomic_intptr_t;
  64 #else
  65 #error No matching integer pointer type
  66 #endif
  67
  68 # define _cairo_atomic_ptr_cmpxchg(x, oldv, newv) \
  69     (void*)__sync_val_compare_and_swap ((cairo_atomic_intptr_t*)x, (cairo_atomic_intptr_t)oldv, (cairo_atomic_intptr_t)newv)
  70
  71 #endif
  72
  73
  74 #ifndef HAS_ATOMIC_OPS
  75
  76 typedef int cairo_atomic_int_t;
  77
  78 cairo_private void
  79 _cairo_atomic_int_inc (int *x);
  80
  81 cairo_private cairo_bool_t
  82 _cairo_atomic_int_dec_and_test (int *x);
  83
  84 cairo_private int
  85 _cairo_atomic_int_cmpxchg (int *x, int oldv, int newv);
  86
  87 cairo_private void *
  88 _cairo_atomic_ptr_cmpxchg (void **x, void *oldv, void *newv);
  89
  90 #endif
  91
  92
  93 #ifdef ATOMIC_OP_NEEDS_MEMORY_BARRIER
  94
  95 # include "cairo-compiler-private.h"
  96
  97 cairo_private int
  98 _cairo_atomic_int_get (int *x);
  99
 100 cairo_private void
 101 _cairo_atomic_int_set (int *x, int value);
 102
 103 #else
 104
 105 # define _cairo_atomic_int_get(x) (*x)
 106 # define _cairo_atomic_int_set(x, value) ((*x) = value)
 107
 108 #endif
 109
 110 #define _cairo_atomic_uint_get(x) _cairo_atomic_int_get(x)
 111 #define _cairo_atomic_uint_cmpxchg(x, oldv, newv) \
 112     _cairo_atomic_int_cmpxchg((int *)x, oldv, newv)
 113
 114 #define _cairo_status_set_error(status, err) do { \
 115     /* hide compiler warnings about cairo_status_t != int (gcc treats its as \
 116      * an unsigned integer instead, and about ignoring the return value. */  \
 117     int ret__ = _cairo_atomic_int_cmpxchg ((int *) status, CAIRO_STATUS_SUCCESS, err); \
 118     (void) ret__; \
 119 } while (0)
 120
 121 CAIRO_END_DECLS
 122
 123 #endif