gc-alloc 0.1.1

A Rust library for garbage-collected memory allocation using libgc (bdwgc).
Documentation 
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/*
 * Copyright (c) 2003 Hewlett-Packard Development Company, L.P.
 * Copyright (c) 2009-2021 Ivan Maidanski
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#if !defined(AO_ATOMIC_OPS_H) || defined(AO_ATOMIC_OPS_INCLUDED)
# error This file should not be included directly.
#endif

/* Some ARM slide set, if it has been read correctly, claims that Loads */
/* followed by either a Load or a Store are ordered, but nothing else.  */
/* It is assumed that Windows interrupt handlers clear the LL/SC flag.  */
/* Unaligned accesses are not guaranteed to be atomic.                  */
#include "../all_aligned_atomic_load_store.h"

#define AO_T_IS_INT

#ifndef AO_ASSUME_WINDOWS98
  /* CAS is always available */
# define AO_ASSUME_WINDOWS98
#endif
#include "common32_defs.h"

/* If only a single processor is used, we can define AO_UNIPROCESSOR.   */
#ifdef AO_UNIPROCESSOR
  AO_INLINE void AO_nop_full(void)
  {
    AO_compiler_barrier();
  }
# define AO_HAVE_nop_full
#else
  /* AO_nop_full() is emulated using AO_test_and_set_full().            */
#endif

#ifndef AO_HAVE_test_and_set_full
# include "../test_and_set_t_is_ao_t.h"
  /* AO_test_and_set_full() is emulated. */
#endif

#if _M_ARM >= 7 && !defined(AO_NO_DOUBLE_CAS)

# include "../standard_ao_double_t.h"

/* These intrinsics are supposed to use LDREXD/STREXD.  */
# pragma intrinsic (_InterlockedCompareExchange64)
# pragma intrinsic (_InterlockedCompareExchange64_acq)
# pragma intrinsic (_InterlockedCompareExchange64_nf)
# pragma intrinsic (_InterlockedCompareExchange64_rel)

  AO_INLINE int
  AO_double_compare_and_swap(volatile AO_double_t *addr,
                             AO_double_t old_val, AO_double_t new_val)
  {
    AO_ASSERT_ADDR_ALIGNED(addr);
    return (double_ptr_storage)_InterlockedCompareExchange64_nf(
                                        (__int64 volatile *)addr,
                                        new_val.AO_whole /* exchange */,
                                        old_val.AO_whole) == old_val.AO_whole;
  }
# define AO_HAVE_double_compare_and_swap

  AO_INLINE int
  AO_double_compare_and_swap_acquire(volatile AO_double_t *addr,
                                     AO_double_t old_val, AO_double_t new_val)
  {
    AO_ASSERT_ADDR_ALIGNED(addr);
    return (double_ptr_storage)_InterlockedCompareExchange64_acq(
                                        (__int64 volatile *)addr,
                                        new_val.AO_whole /* exchange */,
                                        old_val.AO_whole) == old_val.AO_whole;
  }
# define AO_HAVE_double_compare_and_swap_acquire

  AO_INLINE int
  AO_double_compare_and_swap_release(volatile AO_double_t *addr,
                                     AO_double_t old_val, AO_double_t new_val)
  {
    AO_ASSERT_ADDR_ALIGNED(addr);
    return (double_ptr_storage)_InterlockedCompareExchange64_rel(
                                        (__int64 volatile *)addr,
                                        new_val.AO_whole /* exchange */,
                                        old_val.AO_whole) == old_val.AO_whole;
  }
# define AO_HAVE_double_compare_and_swap_release

  AO_INLINE int
  AO_double_compare_and_swap_full(volatile AO_double_t *addr,
                                  AO_double_t old_val, AO_double_t new_val)
  {
    AO_ASSERT_ADDR_ALIGNED(addr);
    return (double_ptr_storage)_InterlockedCompareExchange64(
                                        (__int64 volatile *)addr,
                                        new_val.AO_whole /* exchange */,
                                        old_val.AO_whole) == old_val.AO_whole;
  }
# define AO_HAVE_double_compare_and_swap_full

#endif /* _M_ARM >= 7 && !AO_NO_DOUBLE_CAS */