Chris Wilson | 04495ee | 2009-10-02 04:39:22 +0100 | [diff] [blame] | 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 | /** |
Pauli Nieminen | 21105bc | 2010-03-10 13:35:59 +0200 | [diff] [blame] | 29 | * @file xf86atomics.h |
Chris Wilson | 04495ee | 2009-10-02 04:39:22 +0100 | [diff] [blame] | 30 | * |
| 31 | * Private definitions for atomic operations |
| 32 | */ |
| 33 | |
Pauli Nieminen | 21105bc | 2010-03-10 13:35:59 +0200 | [diff] [blame] | 34 | #ifndef LIBDRM_ATOMICS_H |
| 35 | #define LIBDRM_ATOMICS_H |
Chris Wilson | 04495ee | 2009-10-02 04:39:22 +0100 | [diff] [blame] | 36 | |
| 37 | #ifdef HAVE_CONFIG_H |
| 38 | #include "config.h" |
| 39 | #endif |
| 40 | |
Pauli Nieminen | 21105bc | 2010-03-10 13:35:59 +0200 | [diff] [blame] | 41 | #if HAVE_LIBDRM_ATOMIC_PRIMITIVES |
Chris Wilson | 04495ee | 2009-10-02 04:39:22 +0100 | [diff] [blame] | 42 | |
| 43 | #define HAS_ATOMIC_OPS 1 |
| 44 | |
Eric Anholt | d70d605 | 2009-10-06 12:40:42 -0700 | [diff] [blame] | 45 | typedef struct { |
| 46 | int atomic; |
| 47 | } atomic_t; |
Chris Wilson | 04495ee | 2009-10-02 04:39:22 +0100 | [diff] [blame] | 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) |
Pauli Nieminen | 966c990 | 2009-08-29 12:08:57 +0300 | [diff] [blame] | 53 | # define atomic_add(x, v) ((void) __sync_add_and_fetch(&(x)->atomic, (v))) |
| 54 | # define atomic_dec(x, v) ((void) __sync_sub_and_fetch(&(x)->atomic, (v))) |
Chris Wilson | 04495ee | 2009-10-02 04:39:22 +0100 | [diff] [blame] | 55 | # define atomic_cmpxchg(x, oldv, newv) __sync_val_compare_and_swap (&(x)->atomic, oldv, newv) |
| 56 | |
| 57 | #endif |
| 58 | |
Chris Wilson | 901bacd | 2009-10-13 15:13:00 +0100 | [diff] [blame] | 59 | #if HAVE_LIB_ATOMIC_OPS |
| 60 | #include <atomic_ops.h> |
| 61 | |
| 62 | #define HAS_ATOMIC_OPS 1 |
| 63 | |
| 64 | typedef struct { |
| 65 | AO_t atomic; |
| 66 | } atomic_t; |
| 67 | |
| 68 | # define atomic_read(x) AO_load_full(&(x)->atomic) |
| 69 | # define atomic_set(x, val) AO_store_full(&(x)->atomic, (val)) |
| 70 | # define atomic_inc(x) ((void) AO_fetch_and_add1_full(&(x)->atomic)) |
Pauli Nieminen | 966c990 | 2009-08-29 12:08:57 +0300 | [diff] [blame] | 71 | # define atomic_add(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, (v))) |
| 72 | # define atomic_dec(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, -(v))) |
Chris Wilson | 901bacd | 2009-10-13 15:13:00 +0100 | [diff] [blame] | 73 | # define atomic_dec_and_test(x) (AO_fetch_and_sub1_full(&(x)->atomic) == 1) |
| 74 | # define atomic_cmpxchg(x, oldv, newv) AO_compare_and_swap_full(&(x)->atomic, oldv, newv) |
| 75 | |
| 76 | #endif |
| 77 | |
Alan Coopersmith | b1ce1e6 | 2010-01-16 19:28:50 -0800 | [diff] [blame] | 78 | #if defined(__sun) && !defined(HAS_ATOMIC_OPS) /* Solaris & OpenSolaris */ |
| 79 | |
| 80 | #include <sys/atomic.h> |
| 81 | #define HAS_ATOMIC_OPS 1 |
| 82 | |
| 83 | typedef struct { uint_t atomic; } atomic_t; |
| 84 | |
| 85 | # define atomic_read(x) (int) ((x)->atomic) |
| 86 | # define atomic_set(x, val) ((x)->atomic = (uint_t)(val)) |
| 87 | # define atomic_inc(x) (atomic_inc_uint (&(x)->atomic)) |
| 88 | # define atomic_dec_and_test(x) (atomic_dec_uint_nv(&(x)->atomic) == 1) |
Alan Coopersmith | c9065c5 | 2010-04-16 17:34:11 -0700 | [diff] [blame] | 89 | # define atomic_add(x, v) (atomic_add_int(&(x)->atomic, (v))) |
| 90 | # define atomic_dec(x, v) (atomic_add_int(&(x)->atomic, -(v))) |
Alan Coopersmith | b1ce1e6 | 2010-01-16 19:28:50 -0800 | [diff] [blame] | 91 | # define atomic_cmpxchg(x, oldv, newv) atomic_cas_uint (&(x)->atomic, oldv, newv) |
| 92 | |
| 93 | #endif |
| 94 | |
Chris Wilson | 04495ee | 2009-10-02 04:39:22 +0100 | [diff] [blame] | 95 | #if ! HAS_ATOMIC_OPS |
Pauli Nieminen | 21105bc | 2010-03-10 13:35:59 +0200 | [diff] [blame] | 96 | #error libdrm requires atomic operations, please define them for your CPU/compiler. |
Chris Wilson | 04495ee | 2009-10-02 04:39:22 +0100 | [diff] [blame] | 97 | #endif |
| 98 | |
Lionel Landwerlin | 63fc571 | 2014-09-12 13:48:35 +0100 | [diff] [blame] | 99 | static inline int atomic_add_unless(atomic_t *v, int add, int unless) |
| 100 | { |
| 101 | int c, old; |
| 102 | c = atomic_read(v); |
| 103 | while (c != unless && (old = atomic_cmpxchg(v, c, c + add)) != c) |
| 104 | c = old; |
| 105 | return c == unless; |
| 106 | } |
| 107 | |
Chris Wilson | 04495ee | 2009-10-02 04:39:22 +0100 | [diff] [blame] | 108 | #endif |