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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.  
  42. #define HAS_ATOMIC_OPS 1
  43.  
  44. typedef struct {
  45.         int atomic;
  46. } atomic_t;
  47.  
  48. # define atomic_read(x) ((x)->atomic)
  49. # define atomic_set(x, val) ((x)->atomic = (val))
  50. # define atomic_inc(x) ((void) __sync_fetch_and_add (&(x)->atomic, 1))
  51. # define atomic_inc_return(x) (__sync_add_and_fetch (&(x)->atomic, 1))
  52. # define atomic_dec_and_test(x) (__sync_add_and_fetch (&(x)->atomic, -1) == 0)
  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)))
  55. # define atomic_cmpxchg(x, oldv, newv) __sync_val_compare_and_swap (&(x)->atomic, oldv, newv)
  56.  
  57.  
  58. #if HAVE_LIB_ATOMIC_OPS
  59. #include <atomic_ops.h>
  60.  
  61. #define HAS_ATOMIC_OPS 1
  62.  
  63. typedef struct {
  64.         AO_t atomic;
  65. } atomic_t;
  66.  
  67. # define atomic_read(x) AO_load_full(&(x)->atomic)
  68. # define atomic_set(x, val) AO_store_full(&(x)->atomic, (val))
  69. # define atomic_inc(x) ((void) AO_fetch_and_add1_full(&(x)->atomic))
  70. # define atomic_inc_return(x) (AO_fetch_and_add1_full(&(x)->atomic) + 1)
  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)))
  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.  
  78. #if (defined(__sun) || defined(__NetBSD__)) && !defined(HAS_ATOMIC_OPS)  /* Solaris & OpenSolaris & NetBSD */
  79.  
  80. #include <sys/atomic.h>
  81. #define HAS_ATOMIC_OPS 1
  82.  
  83. #if defined(__NetBSD__)
  84. #define LIBDRM_ATOMIC_TYPE int
  85. #else
  86. #define LIBDRM_ATOMIC_TYPE uint_t
  87. #endif
  88.  
  89. typedef struct { LIBDRM_ATOMIC_TYPE atomic; } atomic_t;
  90.  
  91. # define atomic_read(x) (int) ((x)->atomic)
  92. # define atomic_set(x, val) ((x)->atomic = (LIBDRM_ATOMIC_TYPE)(val))
  93. # define atomic_inc(x) (atomic_inc_uint (&(x)->atomic))
  94. # define atomic_inc_return(x) (atomic_inc_uint_nv(&(x)->atomic))
  95. # define atomic_dec_and_test(x) (atomic_dec_uint_nv(&(x)->atomic) == 0)
  96. # define atomic_add(x, v) (atomic_add_int(&(x)->atomic, (v)))
  97. # define atomic_dec(x, v) (atomic_add_int(&(x)->atomic, -(v)))
  98. # define atomic_cmpxchg(x, oldv, newv) atomic_cas_uint (&(x)->atomic, oldv, newv)
  99.  
  100. #endif
  101.  
  102. #if ! HAS_ATOMIC_OPS
  103. #error libdrm requires atomic operations, please define them for your CPU/compiler.
  104. #endif
  105.  
  106. static inline int atomic_add_unless(atomic_t *v, int add, int unless)
  107. {
  108.         int c, old;
  109.         c = atomic_read(v);
  110.         while (c != unless && (old = atomic_cmpxchg(v, c, c + add)) != c)
  111.                 c = old;
  112.         return c == unless;
  113. }
  114.  
  115. #endif
  116.