glibc/ports/sysdeps/tile/bits/atomic.h

/* Copyright (C) 2011-2013 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <http://www.gnu.org/licenses/>.  */

/* The sub-architecture headers provide definitions for these macros
   that work for "int" and "long" size values only:

   atomic_compare_and_exchange_val_acq()
   atomic_exchange_acq()
   atomic_exchange_and_add()
   atomic_and_val()
   atomic_or_val()
   atomic_decrement_if_positive() [tilegx only]

   Here we provide generic definitions true for all Tilera chips.  */

#include <stdint.h>
#include <features.h>

typedef int32_t atomic32_t;
typedef uint32_t uatomic32_t;
typedef int_fast32_t atomic_fast32_t;
typedef uint_fast32_t uatomic_fast32_t;

typedef int64_t atomic64_t;
typedef uint64_t uatomic64_t;
typedef int_fast64_t atomic_fast64_t;
typedef uint_fast64_t uatomic_fast64_t;

typedef intptr_t atomicptr_t;
typedef uintptr_t uatomicptr_t;
typedef intmax_t atomic_max_t;
typedef uintmax_t uatomic_max_t;

/* Barrier macro. */
#define atomic_full_barrier() __sync_synchronize()

/* APIs with "release" semantics. */
#define atomic_compare_and_exchange_val_rel(mem, n, o)          \
  ({                                                            \
    atomic_full_barrier ();                                     \
    atomic_compare_and_exchange_val_acq ((mem), (n), (o));      \
  })
#define atomic_compare_and_exchange_bool_rel(mem, n, o)         \
  ({                                                            \
    atomic_full_barrier ();                                     \
    atomic_compare_and_exchange_bool_acq ((mem), (n), (o));     \
  })
#define atomic_exchange_rel(mem, n)                             \
  ({                                                            \
    atomic_full_barrier ();                                     \
    atomic_exchange_acq ((mem), (n));                           \
  })

/* Various macros that should just be synonyms. */
#define catomic_exchange_and_add atomic_exchange_and_add
#define atomic_and(mem, mask) ((void) atomic_and_val ((mem), (mask)))
#define catomic_and atomic_and
#define atomic_or(mem, mask) ((void) atomic_or_val ((mem), (mask)))
#define catomic_or atomic_or

/* atomic_bit_test_set in terms of atomic_or_val. */
#define atomic_bit_test_set(mem, bit)                                   \
  ({ __typeof (*(mem)) __att0_mask = ((__typeof (*(mem))) 1 << (bit));  \
    atomic_or_val ((mem), __att0_mask) & __att0_mask; })

/*
 * This non-existent symbol is called for unsupporrted sizes,
 * indicating a bug in the caller.
 */
extern int __atomic_error_bad_argument_size(void)
  __attribute__ ((warning ("bad sizeof atomic argument")));