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 #ifndef ATOMIC_H 29 #define ATOMIC_H 30 31 #if HAVE_ATOMIC_PRIMITIVES 32 33 #define HAS_ATOMIC_OPS 1 34 35 typedef struct { 36 int atomic; 37 } atomic_t; 38 39 # define atomic_read(x) ((x)->atomic) 40 # define atomic_set(x, val) ((x)->atomic = (val)) 41 # define atomic_inc(x) ((void) __sync_fetch_and_add (&(x)->atomic, 1)) 42 # define atomic_dec_and_test(x) (__sync_fetch_and_add (&(x)->atomic, -1) == 1) 43 # define atomic_add(x, v) ((void) __sync_add_and_fetch(&(x)->atomic, (v))) 44 # define atomic_dec(x, v) ((void) __sync_sub_and_fetch(&(x)->atomic, (v))) 45 # define atomic_cmpxchg(x, oldv, newv) __sync_val_compare_and_swap (&(x)->atomic, oldv, newv) 46 47 #endif 48 49 #if HAVE_LIB_ATOMIC_OPS 50 #include <atomic_ops.h> 51 52 #define HAS_ATOMIC_OPS 1 53 54 typedef struct { 55 AO_t atomic; 56 } atomic_t; 57 58 # define atomic_read(x) AO_load_full(&(x)->atomic) 59 # define atomic_set(x, val) AO_store_full(&(x)->atomic, (val)) 60 # define atomic_inc(x) ((void) AO_fetch_and_add1_full(&(x)->atomic)) 61 # define atomic_add(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, (v))) 62 # define atomic_dec(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, -(v))) 63 # define atomic_dec_and_test(x) (AO_fetch_and_sub1_full(&(x)->atomic) == 1) 64 # define atomic_cmpxchg(x, oldv, newv) AO_compare_and_swap_full(&(x)->atomic, oldv, newv) 65 66 #endif 67 68 #if defined(__sun) && !defined(HAS_ATOMIC_OPS) /* Solaris & OpenSolaris */ 69 70 #include <sys/atomic.h> 71 #define HAS_ATOMIC_OPS 1 72 73 typedef struct { uint_t atomic; } atomic_t; 74 75 # define atomic_read(x) (int) ((x)->atomic) 76 # define atomic_set(x, val) ((x)->atomic = (uint_t)(val)) 77 # define atomic_inc(x) (atomic_inc_uint (&(x)->atomic)) 78 # define atomic_dec_and_test(x) (atomic_dec_uint_nv(&(x)->atomic) == 1) 79 # define atomic_add(x, v) (atomic_add_int(&(x)->atomic, (v))) 80 # define atomic_dec(x, v) (atomic_add_int(&(x)->atomic, -(v))) 81 # define atomic_cmpxchg(x, oldv, newv) atomic_cas_uint (&(x)->atomic, oldv, newv) 82 83 #endif 84 85 #if ! HAS_ATOMIC_OPS 86 #error xf86-video-intel requires atomic operations, please define them for your CPU/compiler. 87 #endif 88 89 #endif 90