Jack2  1.9.9
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 
25 #if defined(__ppc__) || defined(__ppc64__)
26 
27 static inline int CAS(register UInt32 value, register UInt32 newvalue, register volatile void* addr)
28 {
29  register int result;
30  asm volatile (
31  "# CAS \n"
32  " lwarx r0, 0, %1 \n" // creates a reservation on addr
33  " cmpw r0, %2 \n" // test value at addr
34  " bne- 1f \n"
35  " sync \n" // synchronize instructions
36  " stwcx. %3, 0, %1 \n" // if the reservation is not altered
37  // stores the new value at addr
38  " bne- 1f \n"
39  " li %0, 1 \n"
40  " b 2f \n"
41  "1: \n"
42  " li %0, 0 \n"
43  "2: \n"
44  : "=r" (result)
45  : "r" (addr), "r" (value), "r" (newvalue)
46  : "r0"
47  );
48  return result;
49 }
50 
51 #endif
52 
53 #if defined(__i386__) || defined(__x86_64__)
54 
55 #define LOCK "lock ; "
56 
57 static inline char CAS(volatile UInt32 value, UInt32 newvalue, volatile void* addr)
58 {
59  register char ret;
60  __asm__ __volatile__ (
61  "# CAS \n\t"
62  LOCK "cmpxchg %2, (%1) \n\t"
63  "sete %0 \n\t"
64  : "=a" (ret)
65  : "c" (addr), "d" (newvalue), "a" (value)
66  );
67  return ret;
68 }
69 
70 #endif
71 
72 #endif
73