osfmk/i386/atomic.h

   1 /*
   2  * Copyright (c) 2015 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #ifndef _I386_ATOMIC_H_
  30 #define _I386_ATOMIC_H_
  31
  32 #include <i386/smp.h>
  33
  34 #if     __SMP__
  35
  36 #define memory_order_consume_smp memory_order_consume
  37 #define memory_order_acquire_smp memory_order_acquire
  38 #define memory_order_release_smp memory_order_release
  39 #define memory_order_acq_rel_smp memory_order_acq_rel
  40 #define memory_order_seq_cst_smp memory_order_seq_cst
  41
  42 #else
  43
  44 #define memory_order_consume_smp memory_order_relaxed
  45 #define memory_order_acquire_smp memory_order_relaxed
  46 #define memory_order_release_smp memory_order_relaxed
  47 #define memory_order_acq_rel_smp memory_order_relaxed
  48 #define memory_order_seq_cst_smp memory_order_relaxed
  49
  50 #endif
  51
  52 #ifdef ATOMIC_PRIVATE
  53
  54 static boolean_t
  55 atomic_compare_exchange(uintptr_t *target, uintptr_t oldval, uintptr_t newval,
  56                         enum memory_order ord, boolean_t wait)
  57 {
  58         (void)wait;
  59         return __c11_atomic_compare_exchange_strong((_Atomic uintptr_t *)target, &oldval, newval, ord, memory_order_relaxed);
  60 }
  61
  62 #endif // ATOMIC_PRIVATE
  63
  64
  65 #endif // _I386_ATOMIC_H_
  66