1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright © 2009 Intel Corporation
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Permission is hereby granted, free of charge, to any person obtaining a
5*4882a593Smuzhiyun * copy of this software and associated documentation files (the "Software"),
6*4882a593Smuzhiyun * to deal in the Software without restriction, including without limitation
7*4882a593Smuzhiyun * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8*4882a593Smuzhiyun * and/or sell copies of the Software, and to permit persons to whom the
9*4882a593Smuzhiyun * Software is furnished to do so, subject to the following conditions:
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * The above copyright notice and this permission notice (including the next
12*4882a593Smuzhiyun * paragraph) shall be included in all copies or substantial portions of the
13*4882a593Smuzhiyun * Software.
14*4882a593Smuzhiyun *
15*4882a593Smuzhiyun * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16*4882a593Smuzhiyun * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17*4882a593Smuzhiyun * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18*4882a593Smuzhiyun * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19*4882a593Smuzhiyun * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20*4882a593Smuzhiyun * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21*4882a593Smuzhiyun * IN THE SOFTWARE.
22*4882a593Smuzhiyun *
23*4882a593Smuzhiyun * Authors:
24*4882a593Smuzhiyun * Chris Wilson <chris@chris-wilson.co.uk>
25*4882a593Smuzhiyun *
26*4882a593Smuzhiyun */
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun /**
29*4882a593Smuzhiyun * @file xf86atomics.h
30*4882a593Smuzhiyun *
31*4882a593Smuzhiyun * Private definitions for atomic operations
32*4882a593Smuzhiyun */
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun #ifndef LIBDRM_ATOMICS_H
35*4882a593Smuzhiyun #define LIBDRM_ATOMICS_H
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun #if HAVE_LIBDRM_ATOMIC_PRIMITIVES
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun #define HAS_ATOMIC_OPS 1
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun typedef struct {
42*4882a593Smuzhiyun int atomic;
43*4882a593Smuzhiyun } atomic_t;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun # define atomic_read(x) ((x)->atomic)
46*4882a593Smuzhiyun # define atomic_set(x, val) ((x)->atomic = (val))
47*4882a593Smuzhiyun # define atomic_inc(x) ((void) __sync_fetch_and_add (&(x)->atomic, 1))
48*4882a593Smuzhiyun # define atomic_inc_return(x) (__sync_add_and_fetch (&(x)->atomic, 1))
49*4882a593Smuzhiyun # define atomic_dec_and_test(x) (__sync_add_and_fetch (&(x)->atomic, -1) == 0)
50*4882a593Smuzhiyun # define atomic_add(x, v) ((void) __sync_add_and_fetch(&(x)->atomic, (v)))
51*4882a593Smuzhiyun # define atomic_dec(x, v) ((void) __sync_sub_and_fetch(&(x)->atomic, (v)))
52*4882a593Smuzhiyun # define atomic_cmpxchg(x, oldv, newv) __sync_val_compare_and_swap (&(x)->atomic, oldv, newv)
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun #endif
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun #if HAVE_LIB_ATOMIC_OPS
57*4882a593Smuzhiyun #define AO_REQUIRE_CAS
58*4882a593Smuzhiyun #include <atomic_ops.h>
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun #define HAS_ATOMIC_OPS 1
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun typedef struct {
63*4882a593Smuzhiyun AO_t atomic;
64*4882a593Smuzhiyun } atomic_t;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun # define atomic_read(x) AO_load_full(&(x)->atomic)
67*4882a593Smuzhiyun # define atomic_set(x, val) AO_store_full(&(x)->atomic, (val))
68*4882a593Smuzhiyun # define atomic_inc(x) ((void) AO_fetch_and_add1_full(&(x)->atomic))
69*4882a593Smuzhiyun # define atomic_inc_return(x) (AO_fetch_and_add1_full(&(x)->atomic) + 1)
70*4882a593Smuzhiyun # define atomic_add(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, (v)))
71*4882a593Smuzhiyun # define atomic_dec(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, -(v)))
72*4882a593Smuzhiyun # define atomic_dec_and_test(x) (AO_fetch_and_sub1_full(&(x)->atomic) == 1)
73*4882a593Smuzhiyun # define atomic_cmpxchg(x, oldv, newv) AO_compare_and_swap_full(&(x)->atomic, oldv, newv)
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun #endif
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun #if (defined(__sun) || defined(__NetBSD__)) && !defined(HAS_ATOMIC_OPS) /* Solaris & OpenSolaris & NetBSD */
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun #include <sys/atomic.h>
80*4882a593Smuzhiyun #define HAS_ATOMIC_OPS 1
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun #if defined(__NetBSD__)
83*4882a593Smuzhiyun #define LIBDRM_ATOMIC_TYPE int
84*4882a593Smuzhiyun #else
85*4882a593Smuzhiyun #define LIBDRM_ATOMIC_TYPE uint_t
86*4882a593Smuzhiyun #endif
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun typedef struct { LIBDRM_ATOMIC_TYPE atomic; } atomic_t;
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun # define atomic_read(x) (int) ((x)->atomic)
91*4882a593Smuzhiyun # define atomic_set(x, val) ((x)->atomic = (LIBDRM_ATOMIC_TYPE)(val))
92*4882a593Smuzhiyun # define atomic_inc(x) (atomic_inc_uint (&(x)->atomic))
93*4882a593Smuzhiyun # define atomic_inc_return(x) (atomic_inc_uint_nv(&(x)->atomic))
94*4882a593Smuzhiyun # define atomic_dec_and_test(x) (atomic_dec_uint_nv(&(x)->atomic) == 0)
95*4882a593Smuzhiyun # define atomic_add(x, v) (atomic_add_int(&(x)->atomic, (v)))
96*4882a593Smuzhiyun # define atomic_dec(x, v) (atomic_add_int(&(x)->atomic, -(v)))
97*4882a593Smuzhiyun # define atomic_cmpxchg(x, oldv, newv) atomic_cas_uint (&(x)->atomic, oldv, newv)
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun #endif
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun #if !defined(HAS_ATOMIC_OPS)
102*4882a593Smuzhiyun #error libdrm requires atomic operations, please define them for your CPU/compiler.
103*4882a593Smuzhiyun #endif
104*4882a593Smuzhiyun
atomic_add_unless(atomic_t * v,int add,int unless)105*4882a593Smuzhiyun static inline int atomic_add_unless(atomic_t *v, int add, int unless)
106*4882a593Smuzhiyun {
107*4882a593Smuzhiyun int c, old;
108*4882a593Smuzhiyun c = atomic_read(v);
109*4882a593Smuzhiyun while (c != unless && (old = atomic_cmpxchg(v, c, c + add)) != c)
110*4882a593Smuzhiyun c = old;
111*4882a593Smuzhiyun return c == unless;
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun #endif
115