ports/sysdeps/aarch64/bits/atomic.h

   1 /* Copyright (C) 2003-2014 Free Software Foundation, Inc.
   2
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _AARCH64_BITS_ATOMIC_H
  20 #define _AARCH64_BITS_ATOMIC_H  1
  21
  22 #include <stdint.h>
  23
  24 typedef int8_t  atomic8_t;
  25 typedef int16_t atomic16_t;
  26 typedef int32_t atomic32_t;
  27 typedef int64_t atomic64_t;
  28
  29 typedef uint8_t  uatomic8_t;
  30 typedef uint16_t uatomic16_t;
  31 typedef uint32_t uatomic32_t;
  32 typedef uint64_t uatomic64_t;
  33
  34 typedef intptr_t atomicptr_t;
  35 typedef uintptr_t uatomicptr_t;
  36 typedef intmax_t atomic_max_t;
  37 typedef uintmax_t uatomic_max_t;
  38
  39
  40 /* Compare and exchange.
  41    For all "bool" routines, we return FALSE if exchange succesful.  */
  42
  43 # define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
  44   ({                                                                    \
  45     typeof (*mem) __oldval = (oldval);                                  \
  46     !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,   \
  47                                   model, __ATOMIC_RELAXED);             \
  48   })
  49
  50 # define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
  51   ({                                                                    \
  52     typeof (*mem) __oldval = (oldval);                                  \
  53     !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,   \
  54                                   model, __ATOMIC_RELAXED);             \
  55   })
  56
  57 # define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
  58   ({                                                                    \
  59     typeof (*mem) __oldval = (oldval);                                  \
  60     !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,   \
  61                                   model, __ATOMIC_RELAXED);             \
  62   })
  63
  64 #  define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
  65   ({                                                                    \
  66     typeof (*mem) __oldval = (oldval);                                  \
  67     !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,   \
  68                                   model, __ATOMIC_RELAXED);             \
  69   })
  70
  71 # define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
  72   ({                                                                    \
  73     typeof (*mem) __oldval = (oldval);                                  \
  74     __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    \
  75                                  model, __ATOMIC_RELAXED);              \
  76     __oldval;                                                           \
  77   })
  78
  79 # define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
  80   ({                                                                    \
  81     typeof (*mem) __oldval = (oldval);                                  \
  82     __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    \
  83                                  model, __ATOMIC_RELAXED);              \
  84     __oldval;                                                           \
  85   })
  86
  87 # define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
  88   ({                                                                    \
  89     typeof (*mem) __oldval = (oldval);                                  \
  90     __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    \
  91                                  model, __ATOMIC_RELAXED);              \
  92     __oldval;                                                           \
  93   })
  94
  95 #  define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
  96   ({                                                                    \
  97     typeof (*mem) __oldval = (oldval);                                  \
  98     __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    \
  99                                  model, __ATOMIC_RELAXED);              \
 100     __oldval;                                                           \
 101   })
 102
 103
 104 /* Compare and exchange with "acquire" semantics, ie barrier after.  */
 105
 106 # define atomic_compare_and_exchange_bool_acq(mem, new, old)    \
 107   __atomic_bool_bysize (__arch_compare_and_exchange_bool, int,  \
 108                         mem, new, old, __ATOMIC_ACQUIRE)
 109
 110 # define atomic_compare_and_exchange_val_acq(mem, new, old)     \
 111   __atomic_val_bysize (__arch_compare_and_exchange_val, int,    \
 112                        mem, new, old, __ATOMIC_ACQUIRE)
 113
 114 /* Compare and exchange with "release" semantics, ie barrier before.  */
 115
 116 # define atomic_compare_and_exchange_bool_rel(mem, new, old)    \
 117   __atomic_bool_bysize (__arch_compare_and_exchange_bool, int,  \
 118                         mem, new, old, __ATOMIC_RELEASE)
 119
 120 # define atomic_compare_and_exchange_val_rel(mem, new, old)      \
 121   __atomic_val_bysize (__arch_compare_and_exchange_val, int,    \
 122                        mem, new, old, __ATOMIC_RELEASE)
 123
 124
 125 /* Atomic exchange (without compare).  */
 126
 127 # define __arch_exchange_8_int(mem, newval, model)      \
 128   __atomic_exchange_n (mem, newval, model)
 129
 130 # define __arch_exchange_16_int(mem, newval, model)     \
 131   __atomic_exchange_n (mem, newval, model)
 132
 133 # define __arch_exchange_32_int(mem, newval, model)     \
 134   __atomic_exchange_n (mem, newval, model)
 135
 136 #  define __arch_exchange_64_int(mem, newval, model)    \
 137   __atomic_exchange_n (mem, newval, model)
 138
 139 # define atomic_exchange_acq(mem, value)                                \
 140   __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)
 141
 142 # define atomic_exchange_rel(mem, value)                                \
 143   __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)
 144
 145
 146 /* Atomically add value and return the previous (unincremented) value.  */
 147
 148 # define __arch_exchange_and_add_8_int(mem, value, model)       \
 149   __atomic_fetch_add (mem, value, model)
 150
 151 # define __arch_exchange_and_add_16_int(mem, value, model)      \
 152   __atomic_fetch_add (mem, value, model)
 153
 154 # define __arch_exchange_and_add_32_int(mem, value, model)      \
 155   __atomic_fetch_add (mem, value, model)
 156
 157 #  define __arch_exchange_and_add_64_int(mem, value, model)     \
 158   __atomic_fetch_add (mem, value, model)
 159
 160 # define atomic_exchange_and_add_acq(mem, value)                        \
 161   __atomic_val_bysize (__arch_exchange_and_add, int, mem, value,        \
 162                        __ATOMIC_ACQUIRE)
 163
 164 # define atomic_exchange_and_add_rel(mem, value)                        \
 165   __atomic_val_bysize (__arch_exchange_and_add, int, mem, value,        \
 166                        __ATOMIC_RELEASE)
 167
 168 /* Barrier macro. */
 169 #define atomic_full_barrier() __sync_synchronize()
 170
 171 #endif