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authorPauli Nieminen2010-03-10 05:35:59 -0600
committerPauli Nieminen2010-03-17 04:48:00 -0500
commit21105bc186d188f0bfc2f41c52b4b0ceb6742cf5 (patch)
tree2ab7cc7a721954530c0abea46a115a3b6e6446e5 /xf86atomic.h
parentdf7157fe2e28796ae1f6d938b850e08c8e1d382d (diff)
downloadexternal-libdrm-21105bc186d188f0bfc2f41c52b4b0ceb6742cf5.tar.gz
external-libdrm-21105bc186d188f0bfc2f41c52b4b0ceb6742cf5.tar.xz
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libdrm: Move intel_atomic.h to libdrm core for sharing.
intel_atomic.h includes very usefull atomic operations for lock free parrallel access of variables. Moving these to core libdrm for code sharing with radeon. Signed-off-by: Pauli Nieminen <suokkos@gmail.com>
Diffstat (limited to 'xf86atomic.h')
-rw-r--r--xf86atomic.h93
1 files changed, 93 insertions, 0 deletions
diff --git a/xf86atomic.h b/xf86atomic.h
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1/*
2 * Copyright © 2009 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 * Chris Wilson <chris@chris-wilson.co.uk>
25 *
26 */
27
28/**
29 * @file xf86atomics.h
30 *
31 * Private definitions for atomic operations
32 */
33
34#ifndef LIBDRM_ATOMICS_H
35#define LIBDRM_ATOMICS_H
36
37#ifdef HAVE_CONFIG_H
38#include "config.h"
39#endif
40
41#if HAVE_LIBDRM_ATOMIC_PRIMITIVES
42
43#define HAS_ATOMIC_OPS 1
44
45typedef struct {
46 int atomic;
47} atomic_t;
48
49# define atomic_read(x) ((x)->atomic)
50# define atomic_set(x, val) ((x)->atomic = (val))
51# define atomic_inc(x) ((void) __sync_fetch_and_add (&(x)->atomic, 1))
52# define atomic_dec_and_test(x) (__sync_fetch_and_add (&(x)->atomic, -1) == 1)
53# define atomic_cmpxchg(x, oldv, newv) __sync_val_compare_and_swap (&(x)->atomic, oldv, newv)
54
55#endif
56
57#if HAVE_LIB_ATOMIC_OPS
58#include <atomic_ops.h>
59
60#define HAS_ATOMIC_OPS 1
61
62typedef struct {
63 AO_t atomic;
64} atomic_t;
65
66# define atomic_read(x) AO_load_full(&(x)->atomic)
67# define atomic_set(x, val) AO_store_full(&(x)->atomic, (val))
68# define atomic_inc(x) ((void) AO_fetch_and_add1_full(&(x)->atomic))
69# define atomic_dec_and_test(x) (AO_fetch_and_sub1_full(&(x)->atomic) == 1)
70# define atomic_cmpxchg(x, oldv, newv) AO_compare_and_swap_full(&(x)->atomic, oldv, newv)
71
72#endif
73
74#if defined(__sun) && !defined(HAS_ATOMIC_OPS) /* Solaris & OpenSolaris */
75
76#include <sys/atomic.h>
77#define HAS_ATOMIC_OPS 1
78
79typedef struct { uint_t atomic; } atomic_t;
80
81# define atomic_read(x) (int) ((x)->atomic)
82# define atomic_set(x, val) ((x)->atomic = (uint_t)(val))
83# define atomic_inc(x) (atomic_inc_uint (&(x)->atomic))
84# define atomic_dec_and_test(x) (atomic_dec_uint_nv(&(x)->atomic) == 1)
85# define atomic_cmpxchg(x, oldv, newv) atomic_cas_uint (&(x)->atomic, oldv, newv)
86
87#endif
88
89#if ! HAS_ATOMIC_OPS
90#error libdrm requires atomic operations, please define them for your CPU/compiler.
91#endif
92
93#endif