sysdeps/tile/atomic-machine.h

   1 /* Copyright (C) 2011-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   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 /* The sub-architecture headers provide definitions for these macros
  20    that work for "int" and "long" size values only:
  21
  22    atomic_compare_and_exchange_val_acq()
  23    atomic_exchange_acq()
  24    atomic_exchange_and_add()
  25    atomic_and_val()
  26    atomic_or_val()
  27    atomic_decrement_if_positive() [tilegx only]
  28
  29    Here we provide generic definitions true for all Tilera chips.  */
  30
  31 #include <stdint.h>
  32 #include <features.h>
  33
  34 typedef int32_t atomic32_t;
  35 typedef uint32_t uatomic32_t;
  36 typedef int_fast32_t atomic_fast32_t;
  37 typedef uint_fast32_t uatomic_fast32_t;
  38
  39 typedef int64_t atomic64_t;
  40 typedef uint64_t uatomic64_t;
  41 typedef int_fast64_t atomic_fast64_t;
  42 typedef uint_fast64_t uatomic_fast64_t;
  43
  44 typedef intptr_t atomicptr_t;
  45 typedef uintptr_t uatomicptr_t;
  46 typedef intmax_t atomic_max_t;
  47 typedef uintmax_t uatomic_max_t;
  48
  49 /* Barrier macro. */
  50 #define atomic_full_barrier() __sync_synchronize()
  51
  52 /* APIs with "release" semantics. */
  53 #define atomic_compare_and_exchange_val_rel(mem, n, o)          \
  54   ({                                                            \
  55     atomic_full_barrier ();                                     \
  56     atomic_compare_and_exchange_val_acq ((mem), (n), (o));      \
  57   })
  58 #define atomic_compare_and_exchange_bool_rel(mem, n, o)         \
  59   ({                                                            \
  60     atomic_full_barrier ();                                     \
  61     atomic_compare_and_exchange_bool_acq ((mem), (n), (o));     \
  62   })
  63 #define atomic_exchange_rel(mem, n)                             \
  64   ({                                                            \
  65     atomic_full_barrier ();                                     \
  66     atomic_exchange_acq ((mem), (n));                           \
  67   })
  68
  69 /* Various macros that should just be synonyms. */
  70 #define catomic_exchange_and_add atomic_exchange_and_add
  71 #define atomic_and(mem, mask) ((void) atomic_and_val ((mem), (mask)))
  72 #define catomic_and atomic_and
  73 #define atomic_or(mem, mask) ((void) atomic_or_val ((mem), (mask)))
  74 #define catomic_or atomic_or
  75
  76 /* atomic_bit_test_set in terms of atomic_or_val. */
  77 #define atomic_bit_test_set(mem, bit)                                   \
  78   ({ __typeof (*(mem)) __att0_mask = ((__typeof (*(mem))) 1 << (bit));  \
  79     atomic_or_val ((mem), __att0_mask) & __att0_mask; })
  80
  81 /*
  82  * This non-existent symbol is called for unsupporrted sizes,
  83  * indicating a bug in the caller.
  84  */
  85 extern int __atomic_error_bad_argument_size(void)
  86   __attribute__ ((warning ("bad sizeof atomic argument")));