macosx/JackAtomic_os.h

   1 /*
   2 Copyright (C) 2004-2008 Grame
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU Lesser General Public License as published by
   6 the Free Software Foundation; either version 2.1 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU Lesser General Public License for more details.
  13
  14 You should have received a copy of the GNU Lesser General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17
  18 */
  19
  20 #ifndef __JackAtomic_APPLE__
  21 #define __JackAtomic_APPLE__
  22
  23 #include "JackTypes.h"
  24 #include <cassert>
  25
  26 #if defined(__ppc__) || defined(__ppc64__)
  27
  28 static inline int CAS(register UInt32 value, register UInt32 newvalue, register volatile void* addr)
  29 {
  30     register int result;
  31     asm volatile (
  32         "# CAS                                  \n"
  33         "       lwarx   r0, 0, %1       \n"         // creates a reservation on addr
  34         "       cmpw    r0, %2          \n"                     //  test value at addr
  35         "       bne-    1f          \n"
  36         "       sync                    \n"         //  synchronize instructions
  37         "       stwcx.  %3, 0, %1       \n"         //  if the reservation is not altered
  38         //  stores the new value at addr
  39         "       bne-    1f          \n"
  40         "   li      %0, 1       \n"
  41         "       b               2f          \n"
  42         "1:                     \n"
  43         "   li      %0, 0       \n"
  44         "2:                     \n"
  45         : "=r" (result)
  46         : "r" (addr), "r" (value), "r" (newvalue)
  47         : "r0"
  48         );
  49     return result;
  50 }
  51
  52 #elif defined(__i386__) || defined(__x86_64__)
  53
  54 #define LOCK "lock ; "
  55
  56 static inline char CAS(volatile UInt32 value, UInt32 newvalue, volatile void* addr)
  57 {
  58     register char ret;
  59     __asm__ __volatile__ (
  60         "# CAS \n\t"
  61         LOCK "cmpxchg %2, (%1) \n\t"
  62         "sete %0               \n\t"
  63         : "=a" (ret)
  64         : "c" (addr), "d" (newvalue), "a" (value)
  65         );
  66     return ret;
  67 }
  68
  69 #else
  70
  71 #include <stdio.h>
  72 static inline char CAS(volatile UInt32 value, UInt32 newvalue, volatile void* addr)
  73 {
  74     // Assert pointer is 32-bit aligned
  75     assert(((long)addr & (sizeof(int)-1)) == 0);
  76     return __sync_bool_compare_and_swap ((UInt32*)addr, value, newvalue);
  77 }
  78
  79 #endif
  80
  81 #endif
  82