sys/remove_counter.c

   1 /*
   2  * Copyright (c) 2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <libkern/OSAtomic.h>
  25
  26 #if defined(__ppc64__) || defined(__i386__) || defined(__x86_64__)
  27 static int64_t __remove_counter = 0;
  28 #else
  29 static int32_t __remove_counter = 0;
  30 #endif
  31
  32 uint64_t
  33 __get_remove_counter(void) {
  34 #if defined(__ppc64__) || defined(__i386__) || defined(__x86_64__)
  35         return (uint64_t)OSAtomicAdd64Barrier(0, &__remove_counter);
  36 #else
  37         return (uint64_t)OSAtomicAdd32Barrier(0, &__remove_counter);
  38 #endif
  39 }
  40
  41 __private_extern__ void
  42 __inc_remove_counter(void)
  43 {
  44 #if defined(__ppc64__) || defined(__i386__) || defined(__x86_64__)
  45         (void)OSAtomicAdd64(1, &__remove_counter);
  46 #else
  47         (void)OSAtomicAdd32(1, &__remove_counter);
  48 #endif
  49 }