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7c6c5b0a JF |
1 | /* |
2 | * Copyright (c) 2003 Apple Computer, 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 | * Copyright 1996 1995 by Open Software Foundation, Inc. 1997 1996 1995 1994 1993 1992 1991 | |
25 | * All Rights Reserved | |
26 | * | |
27 | * Permission to use, copy, modify, and distribute this software and | |
28 | * its documentation for any purpose and without fee is hereby granted, | |
29 | * provided that the above copyright notice appears in all copies and | |
30 | * that both the copyright notice and this permission notice appear in | |
31 | * supporting documentation. | |
32 | * | |
33 | * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE | |
34 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
35 | * FOR A PARTICULAR PURPOSE. | |
36 | * | |
37 | * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR | |
38 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM | |
39 | * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, | |
40 | * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION | |
41 | * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
42 | * | |
43 | */ | |
44 | /* | |
45 | * MkLinux | |
46 | */ | |
47 | ||
48 | /* | |
49 | * POSIX Threads - IEEE 1003.1c | |
50 | */ | |
51 | ||
52 | #ifndef _POSIX_PTHREAD_SPINLOCK_H | |
53 | #define _POSIX_PTHREAD_SPINLOCK_H | |
54 | ||
55 | #include <mach/mach.h> | |
56 | #define __APPLE_API_PRIVATE | |
57 | #include <machine/cpu_capabilities.h> | |
58 | ||
59 | #ifndef __POSIX_LIB__ | |
60 | #define __POSIX_LIB__ | |
61 | #endif | |
62 | ||
63 | #include "pthread_machdep.h" /* Machine-dependent definitions. */ | |
64 | ||
65 | /* Number of times to spin when the lock is unavailable and we are on a | |
66 | multiprocessor. On a uniprocessor we yield the processor immediately. */ | |
67 | #define MP_SPIN_TRIES 1000 | |
68 | extern int _spin_tries; | |
69 | extern int __is_threaded; | |
70 | ||
71 | /* Internal mutex locks for data structures */ | |
72 | #define TRY_LOCK(v) (!__is_threaded || _spin_lock_try((pthread_lock_t *)&(v))) | |
73 | ||
74 | /* _DO_SPINLOCK_LOCK() takes a (pthread_lock_t *) */ | |
75 | #define _DO_SPINLOCK_LOCK(v) _spin_lock(v) | |
76 | ||
77 | /* _DO_SPINLOCK_UNLOCK() takes a (pthread_lock_t *) */ | |
78 | #define _DO_SPINLOCK_UNLOCK(v) _spin_unlock(v) | |
79 | ||
80 | /* LOCK() takes a (pthread_lock_t) */ | |
81 | #define LOCK(v) \ | |
82 | do { \ | |
83 | if (__is_threaded) { \ | |
84 | _DO_SPINLOCK_LOCK((pthread_lock_t *)&(v)); \ | |
85 | } \ | |
86 | } while (0) | |
87 | ||
88 | /* UNLOCK() takes a (pthread_lock_t) */ | |
89 | #define UNLOCK(v) \ | |
90 | do { \ | |
91 | if (__is_threaded) { \ | |
92 | _DO_SPINLOCK_UNLOCK((pthread_lock_t *)&(v)); \ | |
93 | } \ | |
94 | } while (0) | |
95 | ||
96 | /* Prototypes. */ | |
97 | ||
98 | /* Functions defined in machine-dependent files. */ | |
99 | extern void _spin_lock(pthread_lock_t *lockp); | |
100 | extern int _spin_lock_try(pthread_lock_t *lockp); | |
101 | extern void _spin_unlock(pthread_lock_t *lockp); | |
102 | ||
103 | #endif /* _POSIX_PTHREAD_SPINLOCK_H */ |